Sold Online Without a Sales Tax Permit? Next Steps

If you sold online without a sales tax permit, you're not automatically in serious trouble, but the clock is running. Most states let you register late, pay the tax you should have collected, and often reduce penalties if you come forward before they contact you. Waiting is what makes it expensive.

This guide is for the seller who just realized the problem. You'll learn what actually happens when you skip registration, how to calculate what you owe, the steps to fix it, and when a voluntary disclosure agreement makes sense. It's general information, not legal advice, so loop in a CPA for anything large.

What happens if you sold online without a sales tax permit?

You owe the tax whether or not you collected it. In most states, the legal duty to collect sales tax starts when you have nexus, and the permit is just the paperwork. If you didn't collect, the state can assess back taxes from you personally, plus penalties and interest.

That's the part that stings. A customer never paid you that 7% in the first place, so the money comes out of your margin. On a $60,000 year of taxable sales at a 7% blended rate, that's roughly $4,200 you now owe from your own pocket.

A realistic example

Say a candle maker in Texas sold $40,000 of taxable goods through her own storefront over two years and never registered. Texas's state rate is 6.25%, and local taxes can bring the combined rate up to 8.25%. At 8.25%, she owes about $3,300 in tax. If the Texas Comptroller finds her first, a late-filing penalty (Texas starts at 5% and rises to 10% as a return gets later, per the Texas Comptroller's sales tax pages) and interest get added on top. If she registers and files voluntarily, she typically pays the tax plus interest and avoids the worst of the penalty exposure. This is an illustration, not a quote, so check the current rules with your state.

Do you actually have to collect tax yet?

Not always. Whether you owe anything depends on nexus, meaning a taxable connection to a state. You can get it through a physical presence or through sales volume. Our guides on physical nexus vs economic nexus and state economic nexus thresholds explain both.

Since the 2018 Supreme Court decision in South Dakota v. Wayfair, states can require out-of-state sellers to collect once they pass a sales or transaction threshold. South Dakota's own law used $100,000 in sales or 200 transactions, and many states copied the $100,000 figure. Some differ: California and Texas use $500,000, for example. Selling a few items to a state where you're under the threshold usually means no obligation there.

Which sales are most at risk?

Your home state is the first place to look. If you live in a state with a sales tax and sold taxable goods to residents, you likely needed a permit from the first sale. Many states don't offer a small-seller exemption for in-state sales. Check your state revenue department's website to confirm.

If you also sell through Amazon, Etsy, or eBay, the marketplace usually collects for you. Read marketplace facilitator sales tax to see which sales are already covered. Those sales generally aren't your problem. Your own storefront sales are.

Can you charge sales tax without a license?

No. Collecting sales tax without a permit is illegal in most states. A permit gives you the authority to collect tax on the state's behalf. If you charge customers tax without being registered, you're holding money you have no right to keep and nowhere legitimate to send.

This trips up well-meaning sellers. They realize the mistake and start adding tax at checkout immediately, hoping that stops the problem. It doesn't fix the past, and it creates a new one: collected tax that isn't being remitted. Some states treat that as more serious than simply failing to collect.

The right order is simple. Register first, then collect. A few states issue the permit within minutes online. Others take days or weeks. Until yours arrives, hold off on charging tax in that state, and note the delay in your records.

What if you already collected tax without a permit?

Set the money aside in a separate account. Don't spend it. Once you register, remit it with your first return, and tell the state about the earlier period. Sales tax collected from customers is generally treated as trust money, and misusing it brings the harshest penalties.

Sales tax penalties for an unregistered seller

Penalties vary a lot by state, but they usually stack up in three layers: a failure-to-register or failure-to-file penalty, a failure-to-pay penalty, and monthly interest. An unregistered seller found by the state typically pays more than one who comes forward.

Cost layer	Typical range	Notes
Back tax	Full tax due on taxable sales	Owed even if you never collected it
Late filing penalty	5% to 25% of tax due	Often grows per month late
Late payment penalty	Roughly 5% to 25%	Varies by state
Interest	Often 0.5% to 1.5% per month	Compounds the longer you wait
Fraud or willful penalty	Can reach 50% or more	Applies when intent to evade is shown

These ranges are general patterns drawn from published state schedules, not any one state's rules, and they change. For example, Texas applies a 5% penalty at one to 30 days late and 10% after that, while New York and California publish their own, different schedules on their department of revenue sites. Check your state's official figures before you budget. The takeaway is that sales tax penalties for a small business are rarely the biggest cost. The unpaid tax itself is. Penalties and interest are what you control by acting early.

How far back can a state go?

It depends on the state's statute of limitations. Many give the state three to four years from the date a return was filed, though each state sets its own period. Here's the catch: if you never filed, the clock often never starts. That means an unregistered seller can face an open-ended lookback, which is exactly why voluntary disclosure exists.

How do states find unregistered sellers?

More easily than you'd think. States receive data from payment processors, marketplaces, and shipping carriers. Some cross-reference income tax filings against sales tax accounts. Others send nexus questionnaires to sellers shipping into the state. Hoping nobody notices is a weak strategy.

How to register for sales tax late and fix it

You can register for sales tax late in almost every state, and doing it voluntarily is the best move you have. Here's the process, step by step.

1. Pull your sales data. Export every order from your store, payment processor, and any other channel. Break it down by state and by month.
2. Separate what's taxable. Physical goods are usually taxable. Digital products, services, and shipping charges vary by state. Remove marketplace sales where the platform already collected.
3. Check nexus state by state. Start with your home state, then see where you crossed an economic threshold. Our guide to economic nexus for online sellers walks through it.
4. Estimate what you owe. Multiply taxable sales by the combined state and local rate for each location. Add a rough penalty and interest cushion of 10% to 30%.
5. Decide: register directly or disclose first. For small amounts in one state, direct registration works. For larger or multi-state exposure, consider the voluntary route below.
6. Register and start collecting. Once your permit is active, turn on tax collection at checkout. The guide on how to collect and file sales tax for an online store covers setup and filing.
7. File returns on schedule. Even a zero return needs to be filed. Missed returns restart the penalty cycle.

If you're still unsure whether you needed a permit at all, do I need a sales tax permit to sell online breaks down the rules for new sellers.

What if you didn't collect sales tax and your buyers were out of state?

Then your exposure may be much smaller than you fear. Without nexus in a buyer's state, you generally owe nothing there. Dropshippers have extra wrinkles, which we cover in dropshipping sales tax nexus. Document your reasoning state by state so you can defend it if asked.

Is a voluntary disclosure agreement for sales tax worth it?

Often yes, if you owe in several states or for a long period. A voluntary disclosure agreement for sales tax (VDA) lets you come forward before the state contacts you. In exchange, you typically pay the back tax for a limited lookback, commonly three to four years, and the state waives most or all penalties.

The key rule: you generally have to approach the state before it contacts you. Once you receive an audit notice or nexus questionnaire, VDA eligibility often disappears. Timing matters more than anything else here.

How a VDA usually works

• You or your CPA submit an application, often anonymously at first, to see if the state will accept you.
• The state sets a lookback period, frequently limited even if you've been selling longer.
• You pay the back tax and interest, and penalties are usually reduced or waived.
• You register and begin filing normally going forward.

The Multistate Tax Commission runs a national voluntary disclosure program at mtc.gov, letting you approach multiple states at once. For single-state issues, start on your state's department of revenue site.

When you can skip it

If you sold a few hundred dollars of goods in your home state and the tax due is small, a late registration with a short explanation is usually enough. Paying a CPA $1,500 to disclose a $200 liability doesn't make sense. Match the effort to the exposure.

How to avoid this problem going forward

The cheapest fix is a system that tells you when you cross a threshold, so you never guess again. A few habits make the difference.

• Register before your first taxable sale in your home state. It's usually free or under $100.
• Track sales by state monthly. Compare each state's total to its threshold. The IRS and your state tax agency both expect clear records.
• Automate calculation. Our roundup of sales tax automation for ecommerce compares the tools that handle rates and filings.
• Keep your resale paperwork clean. If you buy inventory tax-free, see how a resale certificate for an online store works.
• Review your setup yearly, especially if sales jump or you add a new fulfillment location.

Many sellers also don't realize a business license and a sales tax permit are different things. If you're unsure about the first, read whether you need a business license to sell online.

Sold online without a sales tax permit: the bottom line

Having sold online without a sales tax permit is common and fixable. The tax is owed, but penalties are negotiable if you act first. Pull your sales data, confirm where you have nexus, register, and consider a voluntary disclosure if the numbers are large or span several states.

Once you're compliant, let your store do the tracking. If you're launching or rebuilding, Rovela builds a complete store from a conversation, with Stripe checkout and analytics included, so you can see sales by region from day one. Check the pricing page for what's included. Either way, talk to a CPA before you file anything large.