You built a business past the $10 million mark. You have a finance team, probably an accountant or a CFO, and systems in place for most things. Sales tax, though? For many high-revenue businesses, it’s still being managed like a startup problem — reactively, manually, or not at all.
That’s a costly mistake. At your scale, sales tax isn’t an administrative nuisance. It’s a liability exposure that can run into six or seven figures if it’s not handled correctly. Here are the most common — and most expensive — mistakes we see from businesses at the $10M+ level.
QuickBooks, Xero, NetSuite — these tools are great at tracking transactions. They are not great at interpreting multi-state sales tax law. Most accounting platforms apply basic rate lookups, but they don’t account for product taxability rules, industry-specific exemptions, or the nuances of economic nexus thresholds in each state.
A $10M+ business selling across state lines needs more than a rate table. You need someone who understands the law, not just the software.
“We thought our ERP was handling sales tax automatically. It wasn’t — it was just applying the wrong rates consistently.” — CFO, $30M eCommerce Brand
Since the 2018 South Dakota v. Wayfair decision, physical presence is no longer the only trigger for sales tax obligations. Economic nexus rules mean that if you exceed a revenue or transaction threshold in a state — typically $100,000 in sales or 200 transactions — you’re required to collect and remit sales tax there, even if you’ve never set foot in that state.
Most $10M+ businesses are operating in economic nexus in far more states than they realize. A nexus study is not optional at your scale — it’s the foundation of any compliant strategy.
States where businesses most commonly have unrecognized nexus include:
If you sell to other businesses, exemption certificates are a critical part of your compliance picture. The problem is that certificates expire, businesses change status, and states have different requirements for what a valid certificate looks like.
Many $10M+ companies collect a certificate once and never revisit it. During an audit, an expired or incomplete certificate is treated the same as no certificate at all — meaning you’re on the hook for the tax that should have been collected.
Managing exemption certificates at scale requires a system, not a spreadsheet.
By the time a state sends an audit notice, the window for proactive compliance has closed. Voluntary Disclosure Agreements (VDAs) allow businesses to come forward, register in states where they have back liability, and often negotiate reduced penalties and a limited lookback period — typically 3–4 years instead of the full statute of limitations.
Businesses that wait for the audit lose the ability to negotiate. They also face the full liability, interest, and penalties that come with it. At $10M+ in revenue, that exposure can be significant.
The best time to address back liability is before the state finds you. The second best time is right now.
Your general accountant or CPA firm handles a lot. Income tax, payroll, financial reporting — they’re covering a wide surface area. Sales tax, especially multi-state sales tax, is a specialized discipline that most general practitioners aren’t equipped to manage at depth.
The rules change constantly. States update thresholds, taxability determinations, and filing requirements on a rolling basis. A generalist can’t keep up with 45+ state tax codes the way a dedicated sales tax firm can.
At $10M+ in revenue, the cost of getting this wrong is too high to treat it as a side task for your existing accountant.
Sales tax compliance at scale is not complicated — but it is consequential. The businesses that get it right aren’t necessarily the ones with the biggest finance teams. They’re the ones that recognized early that multi-state sales tax requires dedicated expertise, and brought in the right people before a problem became a liability.
Ready to find out where your business actually stands?
Our team works exclusively with multi-state businesses to identify exposure, manage compliance, and keep you protected. Book a free call and talk to a sales tax specialist today.