You Crossed a Sales Tax Nexus Threshold Last Year. Now What?
Finding out that your business crossed a sales tax threshold months ago can trigger instant panic.
Do you register now? Do you owe tax on every sale? Should you contact the state? What if Amazon, Etsy, or another marketplace already collected the tax?
The right answer is usually not to click the registration button immediately. First, determine when the obligation began, which sales were affected, and whether a voluntary disclosure agreement could reduce the damage.
First, Confirm That You Actually Crossed the Threshold
Do not rely on total company revenue. Build a state-by-state sales report showing the destination state, sale date, amount, sales channel, product or service, and exemption status.
Then check that state's current rule. States do not all use the same threshold or measurement period. Some look at gross sales, while others exclude certain sales. A physical presence, such as an employee or inventory in the state, may also create nexus even when sales remain below the economic threshold.
This is where clean data matters. A report that combines wholesale sales, direct website sales, and marketplace sales without identifying each category can produce the wrong answer.
Do Marketplace Sales Count?
Sometimes. A marketplace may collect and remit sales tax on the transactions it facilitates, but those sales may still count toward your nexus threshold.
For example, Minnesota tells remote sellers to review retail sales from all sources, including marketplaces and their own websites. If the combined sales exceed the threshold, the seller may need to collect tax on direct taxable sales even though the marketplace continues handling tax on marketplace transactions.
Do not assume that selling only through Amazon, Etsy, or another marketplace eliminates every registration or filing issue.
Find the Date Your Collection Obligation Began
Crossing a threshold and owing tax on every earlier sale are not necessarily the same thing.
Each state sets its own start date. The obligation may begin immediately, on the next transaction, on the first day of a later month, or after a short registration window. You need to identify the first date on which the business should have been collecting tax.
Example: Crossing Minnesota's Threshold
Minnesota's small seller exception generally ends when a remote seller has more than $100,000 of retail sales or at least 200 retail transactions shipped into Minnesota during the prior 12 months. Resale transactions supported by a valid exemption certificate are excluded.
After exceeding the exception, the seller must begin collecting by the first day of a calendar month occurring no later than 60 days after the threshold is crossed. Minnesota also states that the seller does not need to collect tax on sales made before the threshold was crossed or during that permitted registration window.
That is a Minnesota example, not a nationwide rule.
Calculate the Past-Due Exposure
Once the correct start date is known, calculate the exposure from that date forward. Separate:
Direct taxable sales on which no tax was collected
Marketplace sales on which the facilitator collected tax
Exempt sales supported by valid certificates
Nontaxable products or services
Tax, interest, and potential penalties
Use the rate and sourcing rules that applied to each sale. Sales tax is often destination-based, so the customer's delivery location may control the state and local rate.
If tax was not collected from the customer, the business may have to pay it from its own margin. That is why a $50,000 exposure estimate based only on gross sales can be either badly overstated or painfully understated.
Decide Between Late Registration and a VDA
A business with limited exposure may register and work directly with the state. A business with larger or older exposure should consider whether a voluntary disclosure agreement, commonly called a VDA, is available.
A VDA may limit the lookback period and waive penalties if the business files the required returns, pays the tax and interest, and remains compliant going forward. See our article “Voluntary Disclosure Agreements: A Smart, Cost-Saving Strategy for Resolving Hidden State Tax Liabilities” for a closer look at how VDAs can work.
Timing matters. Prior contact with the state can disqualify a taxpayer from the MTC voluntary disclosure program for that tax type. Registering, filing a return, making a payment, or receiving a state inquiry may count as contact.
That is why registration should be the result of the analysis, not the first step.
Fix Collection Going Forward
Historical cleanup does not fix tomorrow's checkout process. The business also needs to:
Register in the required states
Configure the correct product taxability and customer exemption settings
Apply the correct state and local rates
Reconcile marketplace and direct sales separately
File every required return, including zero returns when required
Monitor sales by state before another threshold is missed
The Streamlined Sales Tax Registration System can simplify registration in participating states, but registration through that system does not erase prior liability. It also does not replace the need to file returns with each state.
The Bottom Line
If you crossed a sales tax threshold last year, do not ignore it and do not register blindly.
Confirm which sales count, determine the correct collection start date, calculate the actual exposure, and compare late registration with a voluntary disclosure agreement. A careful review can prevent you from paying tax on the wrong sales or giving up relief that was available before the state knew your identity.
Need Help?
Sharp Tax & Accounting helps businesses evaluate multistate sales tax nexus, calculate historical exposure, pursue voluntary disclosures, and build a practical compliance plan.
If you discovered a missed threshold or received a state notice, schedule a consultation before taking the next step.
This article provides general tax information and is not intended as individualized tax, legal, or financial advice. Tax treatment depends on the specific facts and circumstances of each situation.
