A sales tax permit is the state-issued registration that authorizes your business to collect sales tax from customers and hand it over to the taxing authority. If you sell taxable goods or services and have a legal connection to a state that imposes sales tax, you need a permit there before your first taxable sale. Forty-five states impose a general sales tax; Alaska, Delaware, Montana, New Hampshire, and Oregon do not. Selling without a permit where one is required exposes you to back taxes, penalties, and interest that routinely exceed what you would have collected in the first place.
When You Need a Permit
The legal trigger is called nexus. Cross any one of the nexus tests in a state and you have to register there.
Physical Presence
An office, a warehouse, employees, or inventory sitting in a state all create physical nexus. So do temporary activities: attending a trade show, using a third-party fulfillment center in the state, or sending sales reps in. Remote workers are the modern trap. A single employee working from home in a state can establish physical nexus for the employer, even if the company has no other footprint there, because the employee’s regular performance of company duties attributes the company’s presence to that state.
Economic Nexus
Since the Supreme Court’s 2018 decision in South Dakota v. Wayfair, Inc., states can require registration based purely on sales volume, with no physical presence needed.1Supreme Court of the United States. South Dakota v. Wayfair, Inc. The most common threshold is $100,000 in gross sales or 200 separate transactions within a calendar year. A growing number of states have dropped the transaction test and use only the dollar threshold, and a handful set the bar at $250,000 or $500,000. Track revenue by destination state, not just in total, or you’ll miss the state where you crossed the line.
Affiliate and Click-Through Nexus
About 25 states also enforce affiliate nexus, where an out-of-state seller gains nexus through a relationship with an in-state entity that helps establish or maintain the seller’s market. Roughly 15 states recognize click-through nexus, triggered when an in-state website refers customers to the seller through a link in exchange for a commission. These rules are less uniform than economic nexus but can still create obligations that catch smaller online sellers off guard.
If You Sell Through Amazon, eBay, or Etsy
Nearly every state with a sales tax has enacted marketplace facilitator laws that shift the collection responsibility from individual sellers to the platform.2Streamlined Sales Tax Governing Board. Marketplace Facilitator The platform calculates, charges, and remits the tax; you never touch it. That does not automatically excuse you from registering. Sales you make directly through your own website or at craft fairs are not covered by the platform’s collection, and once your direct sales cross the economic nexus threshold in a state, you need your own permit there. Sales the marketplace already handled generally don’t count toward your individual threshold, but the counting rules vary by state, so watch your direct-sale volume in every state where you ship.
What to Gather Before You Apply
Most state portals won’t let you save a half-finished application, so pull everything together first:
- Federal Employer Identification Number. Sole proprietors without an EIN can use a Social Security Number instead.3Streamlined Sales Tax Governing Board. FAQs – About Registrations
- Business formation documents matching your entity type: Articles of Organization for an LLC, Articles of Incorporation for a corporation, or a partnership agreement.
- Legal names, home addresses, and Social Security Numbers for all owners, partners, or corporate officers.
- Your six-digit NAICS code, which identifies your industry and helps the state determine which tax rates apply.4U.S. Census Bureau. North American Industry Classification System
- Estimated monthly taxable sales, which the state uses to set your filing frequency.
- The date business activity began (or will begin) in that state, which sets the effective date of your collection obligation.
How to Apply
One State at a Time
Each state’s Department of Revenue (or equivalent) runs an online portal where you create an account and file the application electronically, usually with an electronic signature. Most states issue permits at no charge, though a few charge fees in the range of $10 to $100. Some states also require a security deposit or surety bond, particularly for businesses with prior tax delinquencies or no established history, and those deposits can be significantly larger than any application fee.
Online applications typically process in under two weeks. Many portals generate a temporary permit or confirmation number immediately, letting you begin collecting tax right away, with the physical permit arriving by mail afterward. Check that the effective date, business name, and address on the permit are correct, because errors here create problems at filing time.
Registering in Many States at Once
If you have nexus in a lot of states, the Streamlined Sales Tax Registration System (SSTRS) is a free portal that registers you in 24 participating member states through a single application.5Streamlined Sales Tax Governing Board. Sales Tax Registration SSTRS Member states include Arkansas, Georgia, Indiana, Iowa, Kansas, Kentucky, Michigan, Minnesota, Nebraska, Nevada, New Jersey, North Carolina, North Dakota, Ohio, Oklahoma, Rhode Island, South Dakota, Utah, Vermont, Washington, West Virginia, Wisconsin, and Wyoming, with Tennessee as an associate member. For any state outside the Streamlined system, you’ll register directly through its own portal.
Buying Inventory Tax-Free With a Resale Certificate
Holding a sales tax permit lets you issue resale certificates to your suppliers. When you buy inventory or raw materials that you intend to resell, a resale certificate tells the vendor not to charge you sales tax on the purchase. The tax gets collected later from the end customer, so taxing at the wholesale stage would double up on the same transaction.
The Multistate Tax Commission publishes a Uniform Sales and Use Tax Exemption/Resale Certificate that many states accept, letting you provide a single document covering purchases across multiple states.6Multistate Tax Commission. Uniform Sales and Use Tax Exemption/Resale Certificate – Multijurisdiction Not every state accepts it, and some require you to be registered where the purchase occurs. Vendors often keep a resale certificate on file as a blanket certificate covering all future orders.
Do not use a resale certificate for items you’ll use yourself or consume in the business. If you buy something tax-free with a resale certificate and then use it, you owe use tax on that item. States audit for this, and penalties for misuse go beyond paying the tax you should have paid; they often include percentage-based surcharges on top.
Staying Compliant After You Register
File Every Period, Even Zero Periods
The state assigns your filing frequency (monthly, quarterly, or annually) based on your sales volume. High-volume sellers file monthly; lower-volume sellers may file quarterly or annually. If your volume changes significantly, the state may reassign you.
Once you have a permit, you must file a return for every period, even when you made zero taxable sales. Zero-dollar returns are not optional. The state treats an open permit as an active business and expects a return every period; a missing return triggers the same penalties as a late return with tax due. Minimum penalties for late or missing returns commonly run around $50 per period, and percentage-based penalties on any tax owed stack on top.
Report Changes and Renewals
Report any significant change (new address, ownership change, updated legal name) to the revenue department. Failing to update these details can cause rejected filings or permit suspension. Most states issue permits that remain valid indefinitely, but a minority require renewal every one to five years. Check your state’s specific rule, because missing a renewal can lapse your authorization to collect tax.
Cancel a Permit You No Longer Need
When you stop selling in a state, formally cancel the permit. Skipping this step is surprisingly consequential. An open permit signals an active business, so the state keeps expecting returns every period. Walk away without canceling and you accumulate unfiled returns, automated penalty assessments, and potentially estimated tax bills based on your historical sales. In some states, leaving a permit open after transferring or closing a business can even make you liable for a new operator’s unpaid taxes if they continue using the same permit.
The Personal Liability You’re Taking On
Sales tax you collect from customers is not your money. States treat it as a trust fund; you’re holding it temporarily on behalf of the government, and your only job is to remit it on time. That classification has teeth. If the business doesn’t remit what it collected, the state can reach past the entity and hold individual owners, officers, and managers personally liable for the full amount. An LLC or corporation does not insulate you. Anyone who controls the company’s finances, signs checks, chooses which bills to pay, or oversees tax compliance is a potential target.
This liability is also not dischargeable in bankruptcy. If your business folds owing $80,000 in collected but unremitted sales tax, that debt follows you personally, even through a Chapter 7 liquidation. Prioritize sales tax remittance the way you prioritize payroll, because the legal consequences are comparable.
Buying an Existing Business
If you’re buying a business, the seller’s unpaid sales tax can become your problem. Most states impose successor liability, meaning the buyer inherits responsibility for the seller’s outstanding tax debts up to the amount of the purchase price. Protect yourself by requesting a tax clearance certificate from the state revenue department before closing. The certificate confirms the seller has no outstanding sales tax liability. Until you have it, withhold enough of the purchase price to cover any potential debt.
Close the deal without a clearance certificate and you can be assessed for the seller’s unpaid taxes, penalties, and interest. Not knowing about the debt is not a defense. The state may also refuse to issue you a new permit until the predecessor’s liability is resolved. This is one of those due diligence items that costs almost nothing to do and can be devastating to skip.
If You Should Have Registered but Didn’t
If you’ve been selling into a state without collecting tax and you realize you should have registered, a voluntary disclosure agreement is usually the best path forward. In a VDA, you approach the state voluntarily, often anonymously through a tax professional, and agree to register and begin collecting. In exchange, the state typically limits the lookback period for unpaid tax to three or four years instead of your full noncompliance period, and it reduces or eliminates penalties on the back taxes.
VDAs are only available before the state contacts you. Once you receive an audit notice, the window closes and you’re subject to the full lookback and full penalties. VDAs also don’t apply if you collected tax from customers but pocketed it instead of remitting; that’s a trust fund violation, and no state gives a break on it. For businesses that genuinely didn’t know they had nexus in a state, a VDA can cut exposure by half or more compared with waiting to be found.