Professional services firms have a running assumption about sales tax: it’s not their problem.
You don’t sell products. You sell expertise. Consulting fees, advisory work, project-based engagements — none of that sounds like something a state tax authority would come after you for.
And for a long time, that assumption was mostly right.
Then 2018 happened.
The Wayfair Moment
In South Dakota v. Wayfair, the Supreme Court changed the rules on sales tax. Before that decision, a business generally only had to collect sales tax in states where it had a physical presence — an office, an employee, a warehouse.
After Wayfair, that changed. States could now require businesses to collect sales tax based on economic activity alone — a certain number of transactions or a revenue threshold in a state, even with zero physical footprint there.
Every state moved fast. Economic nexus laws spread quickly, and the thresholds aren’t always high. In many states, $100,000 in annual sales or 200 transactions is enough to trigger an obligation.
For product-based businesses, this was an immediate and obvious problem. For professional services firms, it felt distant. Maybe irrelevant.
Here’s the thing though: it might not be.
Where Professional Services Firms Actually Have Exposure
The tricky part is that sales tax treatment of services varies wildly by state. Some states tax very few services. Others have expanded their definitions significantly. And the line between a “service” and a taxable “digital product” or “SaaS” gets blurry fast — especially as more firms deliver work through software, portals, or digital platforms.
A few situations worth thinking about:
You’ve hired remote employees or contractors in new states. That can create physical nexus you didn’t have before — and with it, new obligations.
You’ve crossed revenue thresholds in states where you have active clients. Economic nexus doesn’t require an office. It just requires activity.
You deliver any part of your work digitally. Depending on the state, that changes the analysis.
You’ve acquired a client, a book of business, or a firm. Inherited nexus is real and often overlooked.
None of this means you definitely have a problem. But it means the “we don’t sell products so we’re fine” assumption deserves a harder look than most firms give it.
The Problem With Finding Out Too Late
Here’s where it gets uncomfortable.
Most professional services firms find out they have a sales tax exposure the same way: a notice from a state tax authority, an audit, or a due diligence process for a transaction or new client relationship that surfaces something that should’ve been addressed years ago.
At that point, you’re not just dealing with the current liability. You’re dealing with back periods, potential penalties, and interest. And you’re dealing with it at the worst possible time — when stakes are high and time is short.
The much better version of this story is finding out on your own terms, understanding your exposure, and getting the right tools in place before anyone comes looking.
The Tools That Exist
The good news: this is a solved problem. There’s a whole category of software built specifically to handle sales tax compliance — calculating, collecting, filing, and remitting across multiple states automatically.
Once you start doing research, you’ll hear a few names consistently.
Avalara and TaxJar are the established players. They’ve been in this space for years, have broad integrations, and generally do fine work. If you’re already using one of them and it’s working well, there’s no reason to change for the sake of changing.
But there are newer players worth knowing about too.
I had a conversation recently with the team at ZAMP. They’re AI-forward in how they build returns — which apparently drives significant savings in their own model and passes that through to the customer. Gotta love when technology makes things better. (I haven’t done all the math yet, but I’m pretty confident they’ll win on price, too.)
The people were also genuinely lovely — which matters more than people admit when you’re evaluating a long-term compliance partner.
I’m not here to tell you which platform to choose. That depends on your specific situation, your existing tech stack, and your exposure profile. But I am here to tell you that the options are better and more affordable than they used to be — and that “we’ve always done it this way” isn’t a compliance strategy.
What to Actually Do
If you’ve never formally assessed your sales tax exposure as a professional services firm, here’s where to start:
Map where you have activity. States where you have employees, contractors, clients, or significant revenue. That’s your starting point for a nexus analysis.
Talk to someone who knows this area. Sales tax is genuinely complicated and state-specific. A quick conversation with a CPA or tax advisor who knows this space is worth the time before you start making assumptions.
Look at your service delivery model. If any part of what you do is delivered digitally or through software, that’s worth a specific look given how states are treating digital services.
Evaluate your tools. If you do have multi-state obligations, manual compliance is a liability. The right software makes this manageable.
You probably don’t have a massive sales tax problem. But “probably” isn’t a compliance strategy either.
Better to know than to find out the hard way.
Chris Geno is a CPA and fractional controller at High Rock Accounting, working with professional services firms on financial strategy, reporting, and compliance. Have questions about your firm’s exposure? It’s worth a conversation. Thumbnail photo credit: bookskeep.com
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