If you sell services across state lines, you’ve probably noticed the rules don’t follow any consistent logic. What’s taxable in Connecticut might be exempt in California. What you’ve been collecting in New York might need to be broken out differently depending on how it’s delivered. And the definitions states use — “data processing,” “information services,” “computer services” — don’t mean what you think they mean.
This isn’t a knowledge problem. It’s a systems problem. The rules are genuinely different from state to state, they change regularly, and most B2B companies don’t have a repeatable process for keeping up.
This article breaks down how services taxability actually works, where the most common mistakes happen, and how to build a process that keeps your business compliant without creating a bottleneck in sales or billing.
Why Services Taxability Is Complicated
There’s no federal sales tax framework. Each state decides independently what’s taxable, what’s exempt, and how to define a “service” in the first place. That creates a patchwork that doesn’t follow any unified logic.
A few things drive most of the complexity:
Definitions vary by state. “Data processing” might include cloud hosting in one state and mean something narrower in another. Same words, different rules.
Sourcing rules differ. Some states tax services based on where the work is performed. Others look at where the customer receives the benefit. A few use the billing address. When your team is remote and your customers are everywhere, this matters a lot.
Exemptions aren’t consistent. A service sold to a manufacturer might be exempt in one state and fully taxable in another. Resale exemptions for services? Some states recognize them. Others don’t.
States fall into two camps. Enumerated states only tax services that are specifically listed in their tax code — if your service isn’t on the list, it’s exempt by default. Broad-based states tax all services unless specifically exempted — if your service isn’t on the exemption list, it’s taxable by default. Knowing which approach your state uses changes the entire analysis.
The companies that struggle most aren’t the ones facing complexity. They’re the ones trying to solve it case by case instead of building a repeatable process.
The Most Common Mistakes
Assuming services are generally exempt. This was a safer assumption 20 years ago. It’s not reliable now. States have been steadily expanding what they tax, and the trend isn’t slowing down. A blanket assumption that services aren’t taxable will leave you undercollecting in multiple states.
Overcollecting to “play it safe.” If you charge tax on an exempt service, your customer may demand a refund. In some states, improper collection creates its own liability. Playing it safe only works if you’re actually right.
Accepting exemption certificates without verifying them. Not all states allow resale exemptions for services. And even in states that do, the certificate needs to be valid for your specific service category. A blanket certificate from a customer doesn’t automatically cover everything you sell them. This is one of the most common audit findings — and one of the most preventable.
Applying one taxability determination across all states. A determination that your consulting service is exempt in Texas tells you nothing about New Jersey, Ohio, or Washington. Many companies make this mistake and don’t catch it until an audit surfaces it.
Missing bundling rules. If you sell a package that includes both taxable and non-taxable elements, some states tax the entire bundle if any part of it is taxable. Others let you separate the components if you itemize them on the invoice. Many B2B companies don’t know which rules apply to them — or that bundling rules exist at all.
How States Tax Key Service Categories
These aren’t definitive rulings — taxability can shift based on how a service is delivered, who the customer is, and how the transaction is structured. Always verify current rules for your specific situation. That said, here’s how the landscape generally breaks down for common B2B service categories.
IT and Technology Services
Texas broadly taxes data processing and information services. SaaS is treated as a data processing service and is taxable, though only 80% of the charge is subject to tax — 20% is automatically exempt under state law.
California generally does not tax most IT services or SaaS delivered electronically. Most cloud-based software is not subject to sales tax in California.
New York taxes prewritten software — including SaaS — as tangible personal property, whether delivered by download or remote access. Custom software is generally exempt. Information services are taxable unless the data is wholly personal or individualized to the buyer.
Florida generally does not tax SaaS or electronically delivered digital services. Cloud-hosted software accessed remotely is treated as a non-taxable service. Software delivered on physical media is taxable.
Illinois does not have a broad-based state sales tax on IT services or SaaS at the state level. Taxability of specific services can vary; some local taxes may apply in certain cities.
Consulting and Professional Services
Most states exempt traditional professional services like legal, accounting, and medical advice. Exceptions exist in broad-based taxation states.
Hawaii taxes nearly all services under its General Excise Tax, which functions differently from a traditional sales tax but results in similar obligations for service providers.
New Mexico uses a broad-based Gross Receipts Tax that covers most services unless specifically excluded.
Washington recently expanded significantly. Under ESSB 5814, effective October 1, 2025, IT services, custom software development, advertising services, custom website development, and temporary staffing became subject to retail sales tax. Traditional professional services like legal and accounting remain exempt for now.
Connecticut taxes a defined list of services including advertising and public relations services, business analysis, management consulting, and personnel training. It’s an enumerated state — if the service isn’t on the list, it’s generally not taxable.
Marketing and Advertising Services
Connecticut taxes advertising and public relations services. The tax applies to the in-state portion of campaigns, with allocation rules for work that crosses state lines.
Washington now taxes advertising services under the ESSB 5814 expansion effective October 2025.
Texas generally exempts most advertising services, though some specific categories may apply.
New Jersey and Ohio generally exempt advertising services from sales tax.
SaaS and Cloud Services
This is the most actively evolving category. A short reference by state:
Texas: Taxable as a data processing service. 80% of the charge is taxable; 20% is automatically exempt.
New York: Taxable as prewritten software, regardless of delivery method.
California: Generally not taxable when delivered electronically as a cloud service.
Florida: Generally not taxable when accessed remotely via cloud. Software on physical media is taxable.
Connecticut: Taxable at a reduced rate of 1% when sold to a business for business use (compared to the standard 6.35% rate).
Pennsylvania: Taxable. Pennsylvania applies canned software rules to SaaS.
How to Build a Compliance Process
Start with nexus. Before you can determine what’s taxable where, you need to know where you have collection obligations. Nexus can be triggered by physical presence, employees working remotely in a state, economic thresholds, or affiliate relationships. If you don’t have nexus in a state, you generally don’t have a collection obligation there. Map your footprint first.
Build a taxability matrix. For each service you sell, document how it’s treated in each state where you have nexus. Include the service description, state, taxability determination, applicable exemptions, the sourcing rule, and when you last verified it. This takes time upfront and saves significantly more time downstream.
Verify exemption certificates properly. When a customer claims an exemption, confirm that the certificate is valid in the state where the transaction is sourced, that the exemption type covers services (not just goods), that it applies to your specific service category, and that it hasn’t expired. Track expiration dates and request renewals before they lapse.
Review regularly. Tax laws change. Washington’s ESSB 5814 is a recent example — services that were exempt before October 2025 are now taxable. What was accurate last year may not be accurate today. Review your taxability positions at least quarterly for states where you have significant volume.
Document your methodology. However you calculate state-specific taxability, write it down and apply it consistently. If you’re audited, you’ll need to show your work.
Your Next Step
Most B2B companies selling services across state lines have at least one taxability issue they don’t know about. Maybe you’re overcollecting somewhere. Maybe you’re undercollecting somewhere else. Maybe your exemption certificates aren’t valid for the services you’re actually selling.
The companies that stay out of trouble aren’t the ones with the biggest tax departments. They’re the ones who know their nexus footprint, maintain a taxability matrix they actually keep updated, verify certificates before they file them away, and review their positions before an auditor does it for them.
If you want to understand where your business actually stands, a What’s Next consultation with a real sales tax expert is a good place to start. No commitment, no pressure — just a straight answer about what applies to your situation.
Schedule your free What’s Next consultation with The Sales Tax People.
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