When a sales tax audit notice arrives, the first question isn’t usually about strategy or documentation. It’s about money. How much is this going to cost me?

The honest answer: it depends. Sales tax audit defense costs can range from a few thousand dollars to tens of thousands, depending on factors like the number of states involved, your transaction volume, and who’s representing you. But paying for a professional defense usually costs less than the mistakes you’d make on your own.

Do You Need Professional Help for a Sales Tax Audit?

Opening that envelope from the department of revenue triggers an immediate internal debate. You want to protect your business, but you also don’t want to spend thousands of dollars on a consultant if you can just handle the paperwork yourself.

A straightforward audit in a single state with clean records and a small assessment might be something you can handle internally. But certain situations make professional help not just helpful, but essential.

Consider professional audit defense when you’re dealing with:

• Multi-state audits. When more than one state is involved, things get complicated fast. Each state has its own rules, timelines, and negotiation processes. Coordinating responses across different states while running your business is a full-time job in itself.
• Large transaction volume. High-volume businesses face more scrutiny and more sampling challenges. Auditors often apply errors found in a small batch of records across your entire transaction history, which means a small mistake can become a massive assessment.
• Exemption certificate issues. Missing, incomplete, or expired exemption certificates are one of the most common audit triggers. If your documentation isn’t airtight, you need someone who knows how to minimize the damage.
• Nexus disputes. If you’re challenging whether you even have nexus (a strong enough connection to a state that legally requires you to collect their tax), you’re entering legal territory. These disputes require a deep understanding of state-specific rules and how far a state’s taxing power actually reaches.
• Large tax assessments. When the potential liability is significant, the stakes are too high to navigate alone. Professional representation often pays for itself through reduced assessments, penalty abatement, and interest negotiations.

If you’re unsure whether your situation warrants professional help, a quick consultation can provide clarity. At The Sales Tax People, we offer a free “What’s Next” call to assess your needs and help you understand your options. No pressure, no commitment.

What Affects the Cost of Sales Tax Audit Defense?

Every audit is a custom project. You might hand over a clean spreadsheet and be done in a few weeks, or you might spend months digging through old files to prove why certain sales were exempt.

Audit Size and Scope

The bigger the audit, the more it costs to defend. An audit covering three years of transactions requires more work than one covering a single year. Similarly, a comprehensive audit examining all aspects of your sales tax compliance costs more to defend than a limited-scope review focused on one issue.

Auditors may also expand the scope mid-audit if they find problems. What starts as a routine review can grow into a full investigation, increasing both your potential liability and your defense costs.

Number of States Involved

Multi-state audits are way more complicated than single-state audits. Each state has unique:

• Filing requirements and deadlines
• Penalty structures and abatement procedures
• Negotiation processes and settlement options
• Statute of limitations rules

Fighting an audit on multiple fronts means juggling different sets of rules. You have to coordinate your story and negotiate separately with each state’s auditor.

Transaction Volume

High transaction volume creates two things that make it more expensive. First, there’s simply more data to review, organize, and analyze. Second, auditors often use statistical sampling for high-volume businesses. Instead of looking at every single sale, they look at a small chunk of your transactions and assume the rest of your records look exactly the same. It is like tasting a single spoonful of soup to decide if the entire pot needs more salt.

If an auditor samples 100 transactions and finds a 5% error rate, they may apply that rate to millions of transactions. Challenging that sampling methodology requires technical knowledge that most businesses don’t have in-house.

Quality of Your Records

This is the factor you have the most control over. Businesses with organized, complete records spend less on audit defense because their representatives spend less time reconstructing documentation and more time on actual defense strategy.

Poor records mean your defense team has to spend hours digging through old emails, calling former employees, and trying to piece together a puzzle with missing pieces. They must:

• Request documents from multiple internal sources
• Reconcile inconsistent data
• Recreate missing exemption certificates
• Build arguments around incomplete information

Type of Professional Representation

Different experts charge different rates.

A straightforward audit might only need a sales tax consultant. A complex multi-state audit with potential litigation may require an attorney. Many businesses benefit from a team approach that combines different expertise levels for different tasks.

How Much Can a Sales Tax Audit Cost Your Business?

Before deciding how much to invest in defense, you need to understand what’s at stake. Most business owners think they only owe the tax they didn’t collect. They’re usually wrong.

An audit usually means paying for:

• Unpaid sales tax. The base amount you should have collected and remitted. This alone can be substantial if you’ve been selling into a state for years without collecting tax.
• Penalties. Most states impose penalties ranging from 10% to 25% of the unpaid tax. Some states have higher penalties for negligence or fraud. These add up quickly.
• Interest. Interest accrues from the date the tax was originally due, not from the audit date. At rates of 6% to 12% annually, interest on a multi-year audit can equal or exceed the original tax amount.
• Lookback periods. This is the window of time an auditor is legally allowed to review. States can typically audit three to four years of past transactions. If you’ve had nexus for five years without collecting tax, you could face liability for that entire historical period.

The Wayfair Factor

The 2018 Supreme Court decision in South Dakota v. Wayfair, Inc. changed everything for remote sellers. Before Wayfair, you needed boots on the ground to owe sales tax. After Wayfair, a website is enough.

This means businesses that previously had no sales tax obligations may now have years of potential liability in dozens of states. If you’ve been selling online without tracking state-by-state nexus thresholds, your exposure could be significant.

Here’s a simple example: If you’ve sold $200,000 into a state with a 6.5% average sales tax rate, your potential liability is $13,000 in tax alone. Add penalties and interest, and you could be looking at $18,000 to $20,000. Scale that across multiple states and multiple years, and the numbers grow quickly.

Spending $10,000 on professional representation that reduces a $50,000 assessment to $20,000 is a good investment.

How to Reduce Sales Tax Audit Defense Costs

Yes, professional help costs money. And yes, that’s frustrating when you’re already facing a potential tax bill. But here’s the thing: smart preparation and getting ahead of the problem can significantly reduce what you spend on defense.

Organize records before the audit. The single biggest cost driver in audit defense is time spent gathering and organizing documentation. If you can provide your representative with organized records from day one, you’ll save hours of billable time.

• Before engaging a professional, gather:
• Sales transaction data by state and period
• Exemption certificates organized by customer
• Prior sales tax returns and payment records
• Any previous audit correspondence

Respond to auditor requests quickly. Delays extend the audit timeline and increase costs. When auditors request information, provide it promptly and completely. Incomplete responses lead to follow-up requests, which lead to more billable hours.

Maintain exemption certificate documentation. Exemption certificate issues are among the most common and most expensive audit findings. Implement a system to collect, validate, and store certificates before you’re audited. Good software can automate this process and save you thousands in audit defense costs.

Use sales tax automation software. Automated systems create audit trails, calculate rates accurately, and maintain documentation that makes audits easier to defend. The investment in automation often pays for itself in reduced audit exposure and lower defense costs.

Perform internal compliance reviews. Regular self-audits help you identify and fix problems before state auditors find them. There’s a financial incentive to fixing issues early. Voluntary corrections typically result in lower penalties than auditor-discovered errors.

Consider a Voluntary Disclosure Agreement (VDA). If you know you have past liability, a VDA can limit your lookback period and reduce or eliminate penalties. Fixing the issue on your own terms often costs less than defending a full audit.

Should You Handle a Sales Tax Audit Yourself?

Some businesses can successfully manage audits internally. Others put themselves at significant risk by trying to save money on professional fees.

Handling an audit internally might work when:

• The audit involves a single state where you have strong compliance history
• Your records are complete and well-organized
• The potential assessment is relatively small
• You have internal staff with sales tax expertise
• The audit scope is limited and straightforward

The risks of going it alone:

• You may not know what you don’t know. Auditors are trained professionals who do this every day. They know how to find issues you might not realize exist.
• You may inadvertently provide information that expands the audit scope or increases your liability.
• You may miss opportunities for penalty abatement or settlement negotiations.
• You may accept an assessment that a professional could have reduced significantly.

You probably need help when:

• Multiple states are involved
• The potential liability is material to your business
• You have known compliance gaps or documentation issues
• The auditor is challenging your nexus position
• You need to negotiate penalties or payment terms

The decision to hire help means looking at the big picture, including the final assessment, penalties, interest, and the hours your team will burn instead of running the business.

What to Do Next

Understanding audit defense costs is valuable. But knowledge alone doesn’t protect your business.

The real question isn’t whether you can afford professional representation. It’s whether you can afford the alternative. A $15,000 investment in expert defense that reduces a $75,000 assessment to $25,000 isn’t an expense.

When we talk to business owners who get through an audit relatively unscathed, we notice a pattern. They understand their exposure before the audit begins. They have organized records ready to go. And they work with people who know the system, the auditors, and the negotiation process inside and out.

The businesses that struggle share one thing in common. They waited too long to get help.

Whether you’re currently facing an audit notice, suspect you have compliance gaps, or simply want to understand your risk before problems arise, clarity is the first step. And clarity shouldn’t cost you anything.

Ready to understand your options?

Schedule a free “What’s Next” consultation with a real sales tax expert. We’ll assess your situation, answer your questions, and give you a clear roadmap. No fees. Just honest guidance to help you figure out your next move.

Talk to a sales tax expert today and find out exactly what The Sales Tax People can do for your specific situation.

You can keep wondering what an audit would cost you. Or you can find out for free. One of those options lets you sleep better tonight.

Frequently Asked Questions About Sales Tax Audit Defense Costs

How much does a sales tax audit defense cost?

Professional audit defense typically ranges from $5,000 to $50,000 or more, depending on the complexity of your case. Simple single-state audits with good records fall on the lower end. Complex multi-state audits with significant issues can reach the higher end. Most businesses fall somewhere in between.

Do I need a lawyer for a sales tax audit?

Not always. Many audits can be effectively handled by sales tax consultants or CPAs with specialized expertise. However, if your audit involves potential fraud allegations, constitutional nexus challenges, or litigation, an attorney becomes important. For most routine audits, a qualified sales tax professional provides excellent representation at a lower cost than legal counsel.

Can you negotiate after a sales tax audit?

Yes. Audit assessments are often negotiable. You can challenge the auditor’s findings, dispute sampling methodology, request penalty abatement, and negotiate payment terms. Professional representatives often achieve significant reductions through skilled negotiation. The key is knowing what’s negotiable and how to make your case effectively.

Is audit defense tax deductible?

Generally, yes. Professional fees paid for tax advice and audit defense are typically deductible as ordinary business expenses. However, tax law is complex, and deductibility can depend on your specific situation. Consult with your tax advisor for guidance specific to your circumstances.

How long does a sales tax audit take?

Most sales tax audits take three to twelve months from initial notice to final resolution. That is three to twelve months of wondering, waiting, and trying not to think about it every time you check your email. Simple audits with cooperative taxpayers and good records resolve faster. Complex audits involving multiple states, large transaction volumes, or disputed issues can take longer. Your responsiveness to information requests significantly impacts the timeline.

The post The True Cost of Sales Tax Audit Defense: A Comprehensive Guide appeared first on The Sales Tax People.

The post The True Cost of Sales Tax Audit Defense: A Comprehensive Guide appeared first on VAYA TAX & BUSINESS CONSULTANTS.

Updated – Originally published Feb 5, 2025

Getting hit with an unfavorable sales tax audit assessment is stressful and frustrating. But receiving that letter doesn’t mean you are out of options. Businesses have the right to challenge audit findings, and many do so successfully when they know exactly which documents to pull and how to frame their legal arguments.

Most states give you between 30 and 60 days to file an appeal after receiving your assessment. Miss that window, and you lose your chance to dispute the findings. But if you act quickly and build a solid case, you can often reduce your liability or overturn incorrect determinations entirely.

You’ll learn the specific steps to take, the deadlines you can’t afford to miss, what documentation strengthens your position and the common mistakes that ruin otherwise winnable appeals. Whether you’re dealing with an incorrect taxability ruling, missing exemption certificates or an auditor who misunderstood your business model, we will show you what to expect. 

Can You Appeal a Sales Tax Audit?

Yes, businesses can appeal a sales tax audit if they disagree with the auditor’s findings. The appeal process usually includes an informal review, a formal written protest and potentially an administrative hearing.

You have every right to push back. This isn’t about being difficult or adversarial. It’s about ensuring the assessment accurately reflects your actual tax obligations. Auditors are human. They have quotas, bad days and sometimes just get things wrong. They may misunderstand your business model, apply the wrong tax rates or overlook valid exemption certificates you provided.

Here’s what matters: an assessment isn’t the final word. It’s the beginning of a conversation where you have real options.

Common Reasons Businesses Appeal Sales Tax Audits

Let’s look at why businesses actually fight these things. It might help you figure out if it’s worth it.

Incorrect taxability determinations. The auditor classified your products or services incorrectly, applying tax to items that should be exempt or using the wrong tax category altogether. This happens often with software, digital goods and professional services. Software is taxable in Texas but exempt in California, for example.

Missing or rejected exemption certificates. You collected valid exemption certificates from customers, but the auditor either didn’t receive them or rejected them on technical grounds. Sometimes certificates get lost in the shuffle, or the auditor applies overly strict interpretation of what constitutes a valid certificate.

Duplicate assessments. The audit includes transactions you’ve already paid tax on, or it double-counts certain sales. This happens more than you’d think, especially when your accounting system doesn’t speak the same language as theirs.

Incorrect nexus determination. The auditor concluded you had nexus (a significant enough physical or economic presence to trigger tax obligations) in a state where you didn’t actually meet the threshold requirements, or they applied nexus retroactively in ways that don’t align with the law.

Auditor misunderstanding of your business model. Complex business arrangements, drop shipping, marketplace sales or bundled services can confuse auditors who aren’t familiar with your industry. If the auditor fundamentally misunderstood how your business operates, the assessment may be based on flawed assumptions.

Calculation errors. Simple math mistakes happen. The auditor may have used incorrect tax rates, applied the wrong sampling methodology (estimating your total errors based on a small batch of transactions) or made computational errors when projecting findings across your audit period.

If any of this sounds like your situation, you probably have a case.

How Long Do You Have to Appeal a Sales Tax Audit?

Time is not on your side when it comes to sales tax audit appeals. Missing your deadline means losing your appeal rights entirely, regardless of how strong your case might be.

The typical window is 30 to 60 days from the date you receive your audit assessment. Some states give you as little as 20 days, while others may allow up to 90 days for certain types of appeals. The clock starts ticking from the date on your notice, not the date you actually opened the envelope or read the email.

Here’s what makes this tricky: deadlines vary by state, and they can differ based on the type of appeal you’re filing. An informal protest might have a different deadline than a formal administrative appeal. Some states require you to pay the disputed amount (or post a bond) before your appeal can proceed, which adds another layer of timing complexity.

What happens if you miss the deadline? In most cases, the assessment becomes final and legally binding. You’ll owe the full amount plus any penalties and interest that continue to accrue. Courts and administrative bodies rarely grant extensions for missed deadlines, even when you have compelling reasons for the delay.

Protect yourself by:

• Marking the deadline on your calendar the moment you receive the assessment
• Building in buffer time for gathering documentation and preparing your response
• Confirming the exact deadline requirements for your specific state and appeal type
• Considering professional help early if your timeline is tight

Treat your appeal deadline as non-negotiable. Everything else in your appeal strategy depends on meeting this first critical requirement.

5 Steps to Appeal a Sales Tax Audit

The sales tax audit appeal process follows a fairly predictable path, though specific procedures vary by state. Understanding each stage helps you prepare adequately and avoid costly missteps along the way.

Step 1: Review the Audit Assessment Carefully

Before you do anything else, sit down with the audit findings and understand exactly what you’re dealing with. This isn’t the time for a quick skim. You need to know precisely what the auditor found, how they calculated your liability and where you disagree.

What to look for:

• The specific transactions or categories being taxed
• The tax rates applied and whether they’re correct for your situation
• The sampling methodology used (how they extrapolated errors from a small batch of records) and whether it fairly represents your business
• Any exemption certificates that were rejected and the stated reasons
• The time period covered and whether nexus was properly established for that entire period
• Penalty and interest calculations

Create a detailed list of every item you plan to dispute. For each disputed item, note why you believe the auditor got it wrong and what evidence supports your position. This exercise helps you evaluate the strength of your case and becomes the foundation for your formal appeal documentation.

If the numbers are big enough to make you nervous, this is the time to bring in help.

Step 2: Request an Informal Conference

Most states offer an informal conference or review before you enter the formal appeal process. Think of this as a conversation with the auditor or their supervisor where you can address disagreements without all the formal paperwork of a full appeal.

Why the informal stage matters:

• Many disputes get resolved here, saving you time and money
• You can present additional documentation the auditor may not have seen
• Misunderstandings about your business model can be clarified
• You may be able to negotiate a settlement that reduces your liability
• Even if you don’t fully resolve the issue, you’ll learn more about the auditor’s reasoning

What to bring to an informal conference:

• Your detailed list of disputed items
• Supporting documentation for each dispute
• A clear, concise explanation of your position
• Any exemption certificates that were missing or rejected
• Records that clarify how your business operates

Approach this stage professionally but not passively. Ask questions. Understand the auditor’s perspective. Sometimes what feels like a dead end is really just a missing document.

Step 3: File a Formal Written Appeal

If the informal conference doesn’t resolve your concerns, the next step is submitting a formal written protest or appeal petition. This is your official challenge, and it needs to be thorough, organized and on time.

Your formal appeal typically needs to include:

• A clear statement that you’re appealing the assessment
• The specific items you’re disputing and the dollar amounts involved
• Detailed explanations of why you believe each disputed item is incorrect
• Legal arguments citing relevant tax laws, regulations or precedents
• A list of supporting documents you’re submitting as evidence
• Any required forms or fees specified by the state

Writing tips for your formal appeal:

• Be specific and factual, not emotional
• Organize your arguments logically, addressing each disputed item separately
• Reference the exact statutes, regulations or rulings that support your position
• Avoid vague claims like “this isn’t fair” in favor of concrete legal arguments
• Keep your language professional and straightforward

Some states are sticklers for specific forms. Others are more flexible. Either way, check, because getting rejected on a technicality is infuriating.

Step 4: Prepare Documentation and Legal Arguments

Your documentation is the backbone of your appeal. Strong evidence can turn a losing case into a winning one, while weak or disorganized documentation can sink even valid claims.

Essential documents to gather:

• Original sales invoices and contracts
• Exemption certificates (including any that were rejected)
• Shipping documents and delivery records
• Customer correspondence that clarifies transaction details
• Sales tax returns and worksheets from the audit period
• Previous audit records showing consistent treatment of similar issues
• Industry guidance or state bulletins supporting your position

Building your legal arguments:

Research is critical here. State tax bulletins and past rulings are like precedents. If someone else won a similar argument, it strengthens yours.

• Pay particular attention to:
• What your state actually considers taxable. It’s not always obvious.
• Exemption certificate requirements and whether yours meet the technical standards (like having the correct state-specific ID number or signature).
• Nexus threshold rules and when they took effect
• Any safe harbors or good-faith provisions (rules that protect you if you accepted an invalid certificate believing it was legitimate).

If your case involves complex legal questions or significant dollar amounts, working with a tax professional who knows the appeal process can make a real difference in your outcome.

Step 5: Attend the Administrative Hearing

If your written appeal doesn’t resolve the dispute, you may have the opportunity to present your case at an administrative hearing. This is a more formal proceeding where you’ll argue your position before a hearing officer or administrative law judge (an official who functions like a judge for state agency disputes).

Preparing for your hearing:

• Organize your evidence in a clear, logical order
• Prepare any witness testimony you plan to present
• Develop concise talking points for each disputed item
• Create exhibits that visually support your arguments
• Practice explaining complex issues in plain language
• Anticipate questions the hearing officer might ask

During the hearing:

• Present yourself professionally and stay calm
• Stick to the facts and your legal arguments
• Answer questions directly and honestly
• Reference your supporting documentation when making key points
• Don’t argue with the hearing officer or become defensive

The hearing is your chance to make your case in person. Yes, it’s nerve-wracking. But it’s also your best shot at being heard. A well-prepared presentation is usually the difference between winning and losing.

What Improves Your Chances of Winning a Sales Tax Audit Appeal?

Not all appeals are created equal. Some businesses walk away with significant reductions in their assessments, while others see their appeals denied. Here’s what separates successful appeals from unsuccessful ones.

Strong, organized documentation. This is the single biggest factor in appeal outcomes. Businesses that can produce clear, complete records supporting their position have a major advantage. If you’re claiming exemptions, you need valid certificates. If you’re disputing taxability, you need evidence of what you actually sold and how it was used.

Correct taxability classification. Understanding exactly how your products or services should be classified under state tax law is essential. Many appeals succeed because the business can demonstrate the auditor applied the wrong tax treatment. This requires knowing the rules and being able to articulate why your classification is correct.

Valid exemption certificates. Exemption certificate issues are among the most common audit findings, and they’re often appealable. If you can produce valid certificates that meet state requirements, or demonstrate that your customers genuinely qualified for exemptions, you can often overturn these assessments.

Legal precedents and state guidance. Appeals that cite relevant legal authority carry more weight than those based solely on “this doesn’t seem right.” Research state tax bulletins, administrative rulings and court decisions that support your position.

Professional representation. While you can handle an appeal yourself, working with experienced tax professionals often improves outcomes. They know the process, understand what arguments resonate with hearing officers and can identify issues you might miss. For complex cases or large dollar amounts, professional help is usually worth the investment.

Timely, complete filings. Meeting every deadline and following every procedural requirement keeps your appeal on track. Missed deadlines or incomplete filings can result in dismissal regardless of the merits of your case.

Clear, professional communication. How you present your case matters. Well-organized, professional appeals get taken more seriously than messy or emotional ones.

What Happens After Your Appeal Decision

Once you receive a decision on your appeal, you’ll need to evaluate your options and take appropriate action.

If the decision is favorable:

• Document the outcome thoroughly for your records
• Implement any changes needed to prevent similar issues in future audits
• Review your tax compliance procedures to address gaps the audit revealed
• Update your exemption certificate management if that was an issue
• Consider whether your current systems adequately protect you going forward

If the decision is unfavorable:

• Evaluate whether further appeal options exist (many states have multiple levels of administrative review, and court appeals may be available)
• Consider whether a partial settlement makes sense
• Explore payment plan options if you need to pay over time
• Implement corrective measures to prevent similar assessments in the future
• Update your compliance systems based on what you learned

Win or lose, you’ll learn something about where your compliance needs work. Whatever triggered this audit probably points to a gap you can fix.

When to Get Professional Help

You can handle some appeals yourself. Plenty of businesses do. But there’s a point where DIY stops making sense.

Consider working with a tax professional when:

• The assessment involves significant dollar amounts
• The legal issues are complex or involve unclear areas of tax law
• You’re dealing with multi-state nexus questions
• The auditor fundamentally misunderstood your business model
• Your timeline is tight and you need to move quickly
• You’ve never been through the appeal process before
• The stakes are high enough that you can’t afford to lose

What professionals bring to the table:

• Deep knowledge of tax law and regulations
• Experience with the specific appeal procedures in your state
• Strategic guidance on which arguments are most likely to succeed
• Professional representation during hearings
• Relationships with state tax authorities that can facilitate resolution
• Ability to identify issues and opportunities you might miss

The right professional support can help you secure a lower assessment figure and save you hours of administrative headache. At The Sales Tax People, we’ve helped businesses navigate complex audit appeals and find practical ways to limit their exposure. If you’re facing an audit appeal and want to talk through your options, we’re here to help you figure out your next best step. 

What to Do Next

Navigating a sales tax audit appeal takes preparation, attention to deadlines and a willingness to push back when the numbers don’t add up. The businesses that win aren’t always the ones with the best case. They’re the ones who showed up prepared. Whether you’re disputing an incorrect taxability determination, fighting for rejected exemption certificates or challenging a flawed nexus assessment, the outcome usually depends on how well you can back up your claims with hard evidence.

But here’s what matters most: you don’t have to figure this out alone.

Sales tax appeals can feel overwhelming, especially when you’re trying to run a business at the same time. The deadlines are tight. The paperwork is dense. And the stakes are real. That’s why having someone who knows the process can make a real difference.

At The Sales Tax People, we’ve walked businesses through audit appeals of all sizes. We’ve seen what works and what doesn’t. We’re not here to sell you services you don’t need. We’d rather help you understand your options first.

If you’re facing an audit assessment and wondering what comes next, let’s talk. Our free “What’s Next” consultation gives you a chance to walk through your situation with a real sales tax expert. No fees. No pressure. Just a clear picture of what you’re dealing with and what to do next.

Schedule your free consultation and let’s figure out your next best step together.

The post How to Appeal a Sales Tax Audit: Step-by-Step Guide to Winning Your Appeal appeared first on The Sales Tax People.

The post How to Appeal a Sales Tax Audit: Step-by-Step Guide to Winning Your Appeal appeared first on VAYA TAX & BUSINESS CONSULTANTS.

Updated – Originally published February 5th, 2025

If you’re facing an audit, one of the first questions you’re probably asking is:

How long does a sales tax audit take?

The honest answer? It depends. But most sales tax audits last 3–6 months from start to finish. Some move faster. Others, especially multi-state or complex audits, can stretch to a year or more.

Understanding the full sales tax audit timeline helps you prepare, reduce disruption, and protect your business.

Let’s walk through what you can expect.

Average Sales Tax Audit Timeline (3–6 Months)

While every audit is different, here’s a general breakdown of sales tax audit length by complexity:

• Simple audits: 1–3 months
• Standard audits: 3–6 months
• Complex or multi-state audits: 6–12+ months

The more transactions, jurisdictions, and exemptions involved, the longer the sales tax audit duration tends to be.

The 4 Phases of a Sales Tax Audit

Most state audits follow a similar sales tax audit process, even though procedures vary slightly by jurisdiction.

Phase 1 — Pre-Audit (2–4 Weeks)

This phase begins when you receive your audit notification letter.

During pre-audit, you can expect:

• A formal audit notice outlining the scope and tax years under review
• Initial document requests
• Scheduling of an opening conference
• Clarification of systems, software, and filing history

This stage sets expectations and defines the overall state sales tax audit timeline.

Phase 2 — Fieldwork (1–3 Months)

Fieldwork is typically the longest phase of the sales tax audit steps.

Auditors will:

• Review sales tax returns and supporting documentation
• Examine sales invoices and exemption certificates
• Test purchase transactions for use tax compliance
• Conduct transaction sampling in higher-volume businesses
• Issue follow-up documentation requests

Regular communication is common during this phase. The speed of your responses can directly impact the overall sales tax audit length.

Phase 3 — Assessment (2–4 Weeks)

After fieldwork concludes, the auditor compiles findings.

You’ll typically receive:

• Draft audit workpapers
• A preliminary assessment
• A closing conference to discuss findings
• An opportunity to provide additional documentation or clarification

This stage is critical. Many assessments can be reduced if documentation is provided promptly and accurately.

Phase 4 — Resolution & Payment (1–3 Months)

The final phase involves:

• Reviewing the proposed assessment
• Negotiating disputed items
• Receiving the final assessment
• Arranging payment or filing a formal appeal (if necessary)

If an appeal is filed, the timeline may extend beyond the standard 3–6 month window.

Quick Summary Table: Sales Tax Audit Phases

What Can Make a Sales Tax Audit Take Longer?

Several factors can significantly extend your sales tax audit duration.

Multi-State or Complex Business Operations

Businesses operating in multiple states often face longer audits due to:

• Varying state laws
• Different filing frequencies
• Multiple tax rates and product taxability rules

Poor Documentation or Missing Records

Disorganized records are one of the biggest causes of delay.

Missing:

• Exemption or resale certificates
• Detailed transaction reports
• Purchase documentation

can trigger extended review periods and larger sample sizes.

Large Audit Scope (Years or Transaction Types)

Audits may cover:

• Multiple tax years
• Both sales and use tax
• Specific product categories
• Special industry treatments

The broader the scope, the longer the audit.

Nexus Issues or Remote Seller Activity

Since the 2018 Supreme Court decision in South Dakota v. Wayfair, states enforce economic nexus requirements for remote sellers.

If auditors identify potential sales tax nexus in additional states, the review can expand quickly.

In some cases, questions about what triggers a sales tax audit stem from:

• Rapid revenue growth
• Inconsistent filing patterns
• Large exempt sales percentages
• Registration in one state but not others

Nexus reviews often increase overall audit complexity and timeline.

How to Speed Up Your Sales Tax Audit

While you can’t control every variable, you can reduce delays.

Organize and Pre-Prepare All Documentation

Before fieldwork begins, gather:

• Filed sales tax returns
• Detailed sales reports
• Purchase records
• General ledgers
• Exemption certificates

Clean documentation shortens the sales tax audit timeline dramatically.

Assign a Single Point-of-Contact for Auditors

Designate one person to:

• Coordinate internal document collection
• Track requests and deadlines
• Communicate consistently with the auditor

This prevents mixed messages and delays.

Respond Quickly to Auditor Requests

Aim to respond within 48 hours whenever possible. Slow responses extend the fieldwork phase.

Use Automated Tax Software When Possible

Businesses using automated rate calculation and reporting tools often:

• Produce cleaner data exports
• Reduce manual errors
• Provide better audit trails

That means less back-and-forth during review.

When to Bring in a Sales Tax Professional

Consider professional representation if you have:

• Multi-state operations
• High risk of significant assessment
• Large volumes of exempt sales
• Prior audit issues
• Limited internal tax expertise

An experienced advisor can manage communications, reduce exposure, and often streamline the process.

Most importantly, you don’t have to navigate the sales tax audit process alone.

Timeline Summary: How Long Your Audit Will Likely Take

For most businesses:

• Expect 3–6 months total
  
• Simple audits may close in under 3 months
• Complex or multi-state audits may last 6–12+ months

Preparation and organization are the biggest factors in determining how long do tax audits take at the state level.

Sales Tax Audit Timeline by Complexity

Conclusion

So, how long does a sales tax audit take?

For most businesses, plan on 3–6 months. But preparation makes all the difference.

Understanding the sales tax audit phases, organizing documentation, and addressing nexus exposure early can dramatically shorten your audit timeline.

And when the stakes are high, having real accountants and consultants in your corner provides something every business owner wants during an audit:

Peace of mind.Facing an audit now?
Simplify your sales taxes. Protect your business. Partner with The Sales Tax People and discover what’s next.

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Updated – Originally published February 5th, 2025

Sales tax audits can be triggered by a wide range of factors, and understanding those sales tax audit triggers is essential for businesses that want to reduce risk and stay compliant. While no business is completely immune from a state sales tax audit, knowing what catches an auditor’s attention allows you to take proactive steps to protect your business.

Sales tax audits are often data-driven, pattern-based, and influenced by compliance history. The good news? Many audit triggers are avoidable with the right systems, documentation, and guidance in place.

Below, we break down what triggers a sales tax audit, common red flags, and how to reduce your exposure before an issue turns into penalties.

Common Sales Tax Audit Triggers Businesses Should Know

State tax authorities rely on a combination of risk profiling, data analysis, and historical trends when selecting audit candidates. These are some of the most common sales tax audit triggers.

Industry-Specific Sales Tax Audit Triggers

Certain industries face higher audit rates due to transaction complexity, exemption volume, or historical compliance challenges.

Industries commonly targeted for sales tax audits include:

• Cash-intensive businesses like restaurants, retail stores, and convenience stores
• Manufacturers and wholesalers with frequent exempt sales
• High-volume transaction businesses
• Companies selling both taxable and non-taxable products or services

If your business operates in one of these industries, auditors may scrutinize exemption claims, taxability decisions, and reporting accuracy more closely.

Filing Patterns and Compliance Red Flags That Trigger Audits

Your filing history plays a major role in determining audit risk. Filing behavior that may trigger a sales tax audit includes:

• Late or inconsistent filing of sales tax returns
• Frequent amendments to previously filed returns
• Significant fluctuations in reported sales or tax collected
• A history of delinquent payments or unresolved balances

Inconsistent patterns often signal potential compliance issues and may prompt a deeper review of your sales tax reporting.

How State Tax Authorities Use Data to Trigger Audits

Modern audits are often initiated through data analytics. States compare your filings against industry benchmarks and other tax data sources to identify discrepancies.

Common data-driven sales tax audit triggers include:

• Reported sales that fall outside industry averages
• Unusual or excessive exempt sales claims
• Sudden or unexplained revenue changes
• Mismatches between federal income tax returns and state sales tax filings

Even unintentional inconsistencies can raise red flags when automated systems detect anomalies.

High-Risk Business Practices That Increase Sales Tax Audit Chances

Some internal business practices naturally increase audit exposure, even when no wrongdoing exists.

Poor Record Keeping

Inadequate documentation is one of the most common sales tax audit triggers and can significantly impact audit outcomes.

Risk factors include:

• Missing or expired exemption certificates
• Disorganized or incomplete sales records
• Insufficient documentation supporting deductions or exemptions
• Incomplete transaction-level data

Poor records not only increase the likelihood of an audit but can also result in higher sales tax audit penalties if issues are found.

Complex Business Operations

Operational complexity increases audit risk because it introduces more opportunities for errors.

Factors that raise audit likelihood include:

• Operating multiple locations
• Conducting cross-state transactions
• Managing complex supply chains
• Frequent changes to business structure or ownership

The more moving parts your business has, the more important it is to maintain consistent compliance controls.

Economic Nexus and Multi-State Operations: A Growing Audit Trigger

Economic nexus laws have expanded audit exposure for businesses operating across state lines.

Sales tax audit triggers related to nexus include:

• Meeting state-specific economic nexus thresholds
• Operating in multiple jurisdictions
• Recent expansion into new states
• Marketplace facilitator compliance obligations

Businesses often ask how far back can a sales tax audit go. The answer depends on the state and circumstances, but unaddressed nexus exposure can significantly extend audit periods under certain conditions.

External Sales Tax Audit Triggers You Can’t Control

Not all audits are triggered by internal issues. External factors can also prompt state action.

Third-Party Information and Reporting

Audits may begin due to information received from outside sources, including:

• Customer or competitor complaints
• Whistleblower reports
• Information sharing between tax agencies
• Public records or media coverage

These triggers are outside your direct control, making consistent compliance even more critical.

State Revenue Initiatives and Enforcement Campaigns

States may increase audit activity due to broader economic or policy factors, such as:

• Increased audit funding or staffing
• Targeted industry enforcement initiatives
• Changes in state tax laws or interpretations
• Revenue recovery efforts during budget shortfalls

For example, businesses may see heightened enforcement during a Texas sales tax audit, California sales tax audit, Florida sales tax audit, or New York sales tax audit initiative focused on specific industries.

How to Avoid Sales Tax Audit Triggers and Reduce Risk

While no strategy eliminates audit risk entirely, proactive compliance significantly lowers your exposure.

Implement Strong Internal Controls

Reducing audit risk starts with structured processes, including:

• Regular internal compliance reviews
• Documented sales tax procedures
• Staff training on taxability and exemptions
• Quality control checks for filings

These steps also support faster, smoother responses during the sales tax audit process.

Maintain Proper Documentation

Strong record-keeping is one of the most effective forms of sales tax audit defense.

Best practices include:

• Maintaining organized digital records
• Backing up all tax-related documentation regularly
• Proper storage and renewal of exemption certificates
• Creating a clear audit trail for every transaction

Stay Current With Sales Tax Laws

Sales tax rules change frequently, especially around nexus and taxability.

To stay compliant:

• Review state tax regulations regularly
• Subscribe to state tax authority updates
• Consult with sales tax professionals
• Participate in industry groups or compliance forums

What to Do If You Detect Sales Tax Audit Triggers in Your Business

If you identify potential red flags, early action can limit exposure and penalties.

Recommended next steps include:

• Conducting a thorough internal review
• Exploring voluntary disclosure programs when appropriate
• Consulting with sales tax audit help professionals
• Preparing documentation proactively

Addressing issues early can significantly change what happens if you fail a sales tax audit — and may reduce or eliminate penalties.

What Happens If You Trigger a Sales Tax Audit?

If an audit is initiated, expect a structured sales tax audit process that typically includes record requests, fieldwork, and an assessment phase.

A sales tax audit attorney or experienced sales tax audit defense consultant can help:

• Manage communication with auditors
• Respond to documentation requests
• Challenge incorrect findings
• Minimize sales tax audit penalties
  

Professional guidance is especially valuable when audits involve multiple states or extended lookback periods governed by the sales tax audit statute of limitations.

Stay Compliant and Confident: Reduce Your Sales Tax Audit Risk

Understanding sales tax audit triggers is the first step toward reducing audit risk. By maintaining accurate records, implementing strong internal controls, and staying current with changing regulations, your business can significantly lower its exposure.

Even compliant businesses may still be audited. The key is preparation. Consistent processes and expert support make it easier to demonstrate compliance and protect your business.If you’re looking for peace of mind and want confidence that your sales tax compliance can withstand scrutiny, schedule a free “What’s Next?” consultation with a sales tax expert today. Simplify your sales taxes — and protect your business before an auditor comes knocking.

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Updated – Originally published February 5, 2025

Sales tax audits can be stressful for any growing business. But most audits don’t become costly because of fraud — they escalate because of sales tax audit mistakes that could have been avoided with better systems and awareness.

This guide breaks down the most common sales tax audit errors, explains why they matter, and shows how businesses can reduce audit risk through stronger compliance practices and documentation.

Quick List: Most Common Sales Tax Audit Mistakes

• Missing or invalid exemption certificates
• Incorrect sales tax rate application
• Misunderstanding nexus requirements
• Poor documentation or audit trail
• E-commerce system syncing issues
• Filing inconsistencies or late returns

Why Sales Tax Audit Mistakes Matter

Sales tax audit mistakes can trigger penalties, interest, and unexpected tax assessments. Even small errors can quickly grow into larger compliance issues once an auditor begins reviewing your records.

Beyond the immediate financial impact, sales tax audit errors can also:

• Increase the likelihood of expanded or repeat audits
• Raise red flags with state tax authorities
• Damage internal confidence in your compliance process
• Disrupt day-to-day business operations

Understanding these risks — and the sales tax audit triggers behind them — is the first step toward protecting your business.

Most Common Sales Tax Audit Mistakes

Incomplete or Disorganized Records

Poor recordkeeping is one of the most common sales tax audit issues. When documentation is missing or disorganized, auditors may assume non-compliance — even when tax was calculated correctly.

Strong records should include:

• Detailed transaction-level sales data
• Clear tax calculations for each sale
• Supporting documentation for tax decisions
• A complete, traceable audit trail

Businesses should also maintain:

• Comprehensive sales journals
• Accurate tax rate records by jurisdiction
• Documentation supporting exempt or non-taxable sales

Missing or Invalid Exemption Certificates

Exemption certificate errors are a frequent cause of audit assessments. Common sales tax documentation issues include:

• Failing to collect certificates before exempt sales
• Accepting expired or incomplete certificates
• Not verifying certificate accuracy
• Poor storage or retrieval systems

Without valid certificates on file, auditors may reclassify exempt sales as taxable.

Misunderstanding Nexus Requirements

Many businesses struggle to track nexus accurately across multiple states. Economic nexus thresholds vary by jurisdiction, and crossing them — even unintentionally — can create new filing and registration obligations.

Failing to monitor sales activity by state is a major sales tax compliance mistake that often surfaces during audits.

Incorrect Sales Tax Rate Application

Sales tax rates change frequently and vary by location. Common mistakes include:

• Using outdated state or local rates
• Missing special tax districts
• Misapplying local tax overlays
• Incorrectly handling tax holidays

These sales tax audit errors often affect large volumes of transactions, increasing exposure.

Misclassifying Products or Services

Incorrect product or service taxability — sometimes called classification errors in sales tax — can result in consistent over- or under-collection.

Errors often occur when businesses:

• Apply one taxability rule universally
• Don’t account for state-specific exemptions
• Fail to update classifications as offerings evolve

Technology-Related Compliance Mistakes

Software Configuration Issues

Automation helps, but only when systems are set up correctly. Misconfigured tax software can apply incorrect rules across hundreds or thousands of transactions.

Regular reviews of tax engine settings are essential to prevent systemic sales tax audit mistakes.

E-commerce Integrations Not Syncing

Disconnected systems are a common audit risk. When e-commerce platforms don’t sync properly with accounting or tax software, discrepancies appear between:

• Collected tax
• Reported tax
• Filed returns

These inconsistencies often trigger auditor scrutiny.

Outdated Tax Rate Tables

Failing to update tax rate tables can lead to incorrect calculations — especially in states with frequent rate changes or layered local taxes.

Documentation and Filing Errors

Filing Returns Late or Inconsistently

Late filings, missed deadlines, or inconsistent reporting across returns are common sales tax audit triggers.

Reporting That Doesn’t Match Financial Statements

Auditors routinely reconcile sales tax returns with financial statements. Differences without explanation can raise red flags.

Poor Audit Trail Documentation

If auditors can’t easily trace how tax was calculated, reported, and filed, they may assume errors — even when calculations were correct.

Best Practices to Prevent Audit Mistakes

Regular Internal Sales Tax Audits

Routine internal reviews help identify issues early. Focus on:

• Documentation completeness
• Tax calculation accuracy
• Exemption certificate validity
• Filing consistency

Better Exemption Certificate Management

Centralized systems, standardized processes, and periodic reviews reduce documentation risk.

Ongoing Staff Training

Staff involved in billing, accounting, or compliance should receive:

• Updates on tax law changes
• Training on nexus rules
• Guidance on documentation requirements
• Proper tax software usage

Automating Compliance Where Possible

Automation can improve accuracy — when paired with oversight, configuration reviews, and expert guidance.

What to Do If You Find Sales Tax Mistakes

Immediate Steps to Correct Errors

If issues surface internally or during an audit:

• Document the scope of the error
• Quantify potential exposure
• Correct systems or processes
• Address issues promptly

When to Consider Voluntary Disclosure

For unregistered nexus or historical exposure, voluntary disclosure agreements (VDAs) may help limit penalties and lookback periods.

Long-Term Prevention Measures

Prevent repeat issues by:

• Establishing clear tax determination procedures
• Maintaining updated documentation systems
• Scheduling regular compliance reviews

Conclusion: Strong Tax Systems Reduce Audit Risk

Avoiding sales tax audit mistakes requires ongoing attention, accurate systems, and clear documentation. While audits can’t always be avoided, businesses that invest in strong compliance foundations face fewer surprises and less risk.

Sales tax compliance isn’t a one-time task — it’s an ongoing process. Regular reviews, system updates, and proactive planning help reduce audit exposure and protect your business as it grows.

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Updated – Originally published February 23, 2025

Sales tax is complex on an ordinary day, and when a sales tax audit notice arrives, the stress can escalate quickly. Whether you’re a startup or an established enterprise, every business faces the possibility of a state review to confirm that sales tax has been calculated, collected, and remitted correctly.

This guide walks you through what a sales tax audit is, why it happens, how to prepare, and how to prevent costly penalties so you can approach the process with clarity and confidence—not fear.

Understanding Sales Tax Audits

What Is a Sales Tax Audit?

A sales tax audit is a state’s formal review of your business’s sales activity to determine whether you’ve collected and paid the correct amount of sales tax. During the audit, an auditor compares your reported revenue with your tax returns, exemption documentation, and financial records. Their goal is simple: confirm compliance.

For many businesses, this is the first time anyone has ever looked closely at their sales tax processes. That alone can be intimidating, which is why understanding what’s being reviewed—and why—matters so much.

Why States Conduct Sales Tax Audits

Sales tax represents a significant source of state revenue. When filings contain inconsistencies or when something in your industry raises attention, states take notice. Sometimes the trigger is as simple as a routine rotation; other times it’s because your business’s activity signals a need for closer review.

If you’ve ever wondered, Why am I being audited for sales tax?—know that the reason often has little to do with wrongdoing and more to do with verifying accuracy within a constantly changing regulatory landscape.

Common Triggers for a Sales Tax Audit

Business and Industry Risk Factors

Some industries naturally invite more attention because their taxability rules are complex. Manufacturing, e-commerce, oil and gas, construction, and software often fall into this category. Your business may also be pulled into an audit if a supplier, customer, or competitor is under review. Sometimes major business changes like mergers, expansions, or relocations prompt the state to confirm that you’re collecting tax appropriately during the transition.

Filing Inconsistencies and Record Discrepancies

Filing patterns can signal risk. States look closely at sudden swings in revenue, unusually high exempt sales, missing or invalid exemption certificates, frequent amended returns, or numbers that simply don’t reconcile across records. These inconsistencies are among the most common reasons a tax audit is initiated.

What to Expect During a Sales Tax Audit

The Auditor’s Review Process

Once notified, you’ll receive a request for documents—usually sales tax returns, invoices, bank statements, exemption certificates, and other financial records. Auditors typically examine a three- to four-year period, but if they suspect significant underreporting, they may expand their lookback.

The process itself can last a few days or stretch into multiple weeks, depending on the size of your business and the availability of the records they request. Throughout the audit, the auditor will cross-check what you reported with what actually occurred, focusing closely on nexus, taxability, and consistency across your filings.

Possible Sales Tax Deficiencies and Penalties

If the auditor identifies areas where sales tax wasn’t collected, calculated, or remitted properly, the state may assess additional tax, penalties, and interest. In rare cases where underpayment appears intentional, legal consequences may follow. Even when errors are unintentional, the financial impact can be significant—another reason businesses often rely on professional sales tax services long before an issue arises.

How to Prepare for a Sales Tax Audit

Consult a Sales Tax Compliance Specialist

Sales tax rules shift often, and every state approaches audits differently. Many businesses partner with professional sales tax compliance services to help guide them through the process. A specialist can speak the auditor’s language, help you understand exactly what the state is looking for, anticipate questions, and negotiate the scope where appropriate. This support can dramatically reduce both stress and risk.

Collect and Organize Documentation

Being organized is one of the most effective ways to ensure a smooth audit. Gather the records the auditor requests and ensure they are complete, consistent, and easy to access. States generally review recent years, but if they suspect major errors or potential fraud, the statute of limitations can expand dramatically. Presenting clean, well-organized documents goes a long way in demonstrating professionalism and goodwill—which often improves the audit experience.

Designate a Company Representative

Choose one knowledgeable person to act as the point of communication for the audit. This representative should be familiar with your products or services, understand any exemptions or special tax rules affecting your business, and know where all relevant documentation is stored. Having a single, informed voice reduces confusion and keeps conversations aligned and accurate.

Prepare Your Employees for the Audit Process

Even if most employees won’t interact with the auditor, they should know an audit is happening, who the auditor is, and who is authorized to answer questions. Employees may feel anxious during a review; offering clarity and direction helps keep your team confident and calm.

Understanding the Post-Audit Process

Review the Audit Assessment

After the auditor has reviewed your records, they will issue an assessment outlining their findings. This is your first opportunity to confirm whether you agree with the auditor’s conclusions.

Responding to Requests for Additional Information

There may be a period of back-and-forth after the initial assessment. You can provide comments or supporting documents, and the auditor may revise or refine their conclusions based on new information. This stage continues until the state believes it has a full picture of your sales tax activity.

Filing an Appeal or Requesting Redetermination

Once the audit is finalized, the state typically offers a 30- to 60-day window to dispute findings, request redetermination, or pay any assessed amount. Timely action here can significantly influence the final outcome.

How to Avoid Costly Sales Tax Audits

Maintain Accurate and Organized Records

Clear, consistent records don’t just reduce the likelihood of an audit—they make every part of compliance easier. Even if the state audits you randomly, organized documentation helps you move through the process faster and with less stress.

Conduct Regular Self-Audits for Tax Compliance

Many businesses run internal reviews that mirror what a state auditor would examine. These self-audits help identify risk areas early and prevent small mistakes from becoming costly. Partnering with professional sales tax services makes this process more effective by ensuring you’re evaluating your compliance against current laws—not last year’s rules.

Train Your Staff in Sales Tax Compliance

Sales tax compliance isn’t just the responsibility of one person. Anyone involved in sales, invoicing, or financial reporting should understand the basics of taxability, nexus, and proper documentation. When your team understands the “why” behind sales tax, accuracy improves.

Leverage Technology and Automation

Rates change frequently and vary by jurisdiction. Automation can reduce the manual burden and minimize calculation errors. Even so, technology works best when paired with knowledgeable oversight—especially in industries with complex tax rules.

Professional Sales Tax Compliance Services

Sales tax isn’t designed to be easy—and you shouldn’t have to navigate it alone. Working with a trusted provider of sales tax compliance services ensures accurate reporting, timely remittance, and a clear understanding of your nexus footprint. It also helps protect your business from penalties, reduce audit risks, and give you peace of mind that your sales tax obligations are handled by real people who understand the intricacies of state tax laws.At The Sales Tax People, we take sales tax seriously—but we don’t take ourselves too seriously. We’re here to guide you, simplify the process, and help you build a foundation of compliance that supports your long-term growth.

FAQ Sales Tax Audits

How far back can a sales tax audit go?

Most states review three to four years of sales tax filings, but the audit period may extend further if significant errors or fraud are suspected.

What to Expect in a Sales Tax Audit

What are the penalties for failing a sales tax audit?

Penalties may include unpaid tax, interest, and fines. Even unintentional mistakes can result in substantial financial liability.

Sales Tax Penalties Explained

Should I hire a professional for a sales tax audit?

Many businesses work with sales tax professionals to manage documentation, communicate with auditors, and reduce audit risk.

Sales Tax Compliance Services

How can I reduce my risk of a sales tax audit?

Maintaining accurate records, conducting regular self-audits, monitoring nexus, and staying updated on tax law changes all reduce audit risk.

Free Nexus Calculator

Can sales tax audits be appealed?

Yes. Most states allow businesses to appeal or request redetermination within 30 to 60 days of the audit assessment.

How to Appeal a Sales Tax Audit

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