Sales Tax Permit: How to Register and Verify

What Is a Sales and Use Tax Permit?

A sales and use tax permit is state authorization to collect sales tax from your customers and remit it to the state. Most states call it “sales and use” because one registration covers two taxes: sales tax on in-state sales, and use tax on taxable goods a buyer brings in untaxed from out of state. One permit, both obligations.

You need this permit before your first taxable sale in a state where you have nexus. Collecting tax without it is a problem in most states, so registration comes first.

Is a Sales Tax Permit the Same as a Seller’s Permit?

Yes. They are the same authorization, and the name changes by state. California issues a seller’s permit. Texas issues a Sales and Use Tax Permit. Arizona issues a transaction privilege tax (TPT) license. Search any of these terms and you are looking for the same underlying registration to collect and remit tax.

Arizona’s TPT is technically a tax on the seller for the privilege of doing business, not a tax on the buyer. It functions like a sales tax permit for registration purposes, but the structure differs.

What Is Use Tax?

Use tax is the buyer-side complement to sales tax. It is owed when a taxable item arrives without sales tax charged, usually on an out-of-state purchase. Example: your business buys equipment from an out-of-state vendor that charges no tax. You self-assess use tax on that equipment and remit it to your state. The rate typically matches your local sales tax rate.

What Is Sales Tax Nexus?

Nexus is the connection between your business and a state that triggers a duty to collect its tax. Two main types create it: physical presence and economic activity. A third, affiliate nexus, arises through related parties. You register only in states where you have one of these connections, not everywhere you make a sale.

What creates physical nexus?

Physical nexus comes from a tangible presence in the state: an office, storefront, warehouse, employees, or inventory stored in-state. The common trap is inventory sitting in an Amazon fulfillment center under Fulfillment by Amazon (FBA), which can create physical nexus in that state. Trade show attendance and in-state contractors also trigger it in some states.

What creates economic nexus?

Economic nexus comes from sales volume alone, with no physical presence required. Once your sales into a state cross its dollar (or transaction) threshold, you must register there. Thresholds vary widely by state. The Wayfair section below breaks down the numbers, and Commenda’s US economic nexus exposure guide tracks them state by state.

What is affiliate nexus?

Affiliate nexus is created through in-state affiliates or related parties that refer sales or act on your behalf. A local partner who promotes your products for commission, or a related company with in-state presence, can establish it. Rules differ by state, so check the state-by-state detail in Commenda’s nexus exposure guide before assuming you are clear.

What Did the Wayfair Decision Change About Economic Nexus?

South Dakota v. Wayfair, Inc., decided June 21, 2018 in a 5-4 ruling, let states require collection based on sales volume alone. It overturned the physical-presence rule from Quill Corp. v. North Dakota (1992), per the U.S. Supreme Court opinion. South Dakota’s upheld law set $100,000 in sales or 200 transactions as the trigger.

That $100,000-or-200-transactions template is common, not universal. Several states use higher dollar figures, and several have dropped the transaction prong entirely. Check the specific state.

South Dakota itself dropped the 200-transaction prong, so even the state that set the standard no longer uses it.

Who Needs a Sales Tax Permit?

Any business with nexus in a state that sells taxable goods or services there needs a permit before its first taxable sale. That covers three groups: brick-and-mortar stores with a physical location, e-commerce sellers who cross a state’s economic threshold, and service providers whose services are taxable in that state.

Service providers should not assume they are exempt. Some states tax specific services, and taxability varies widely from state to state. Check the state’s list of taxable services before deciding you do not need to register.

Do I Need a Sales Tax Permit to Sell Online?

Yes, if you have physical or economic nexus in a state. Selling online does not exempt you, and it does not automatically obligate you everywhere either. Direct-to-consumer (D2C) sales through your own site create their own collection obligation. Inventory you place in a state can create physical nexus. Economic thresholds then apply on a per-state basis.

The practical takeaway: map your nexus first, then register only where you have crossed a threshold or have physical presence.

Do Marketplace Sellers Need Their Own Permit?

Often no, if you sell exclusively through a facilitator that collects and remits the tax for you, but this is state-dependent, so check each state where you have nexus. Marketplace facilitator laws make platforms like Amazon, Etsy, eBay, and Walmart collect and remit on your behalf. Some states still require the seller to register even when the facilitator remits.

Two traps matter. First, mixed channels: if you sell on Amazon and on your own Shopify store, the direct sales are your responsibility. Second, threshold math. In Texas, remote sellers must include marketplace sales in the $500,000 safe-harbor calculation as of April 1, 2020, per the Texas Comptroller. So $300,000 direct plus $300,000 marketplace equals $600,000 and exceeds the threshold. Whether marketplace sales count varies by state.

How Do You Register for a Sales Tax Permit?

Register online through each nexus state’s Department of Revenue portal. Most permits are free, and approval typically arrives within days to a few weeks depending on the state. Follow these steps:

1. Confirm nexus first. Over-registering creates ongoing filing obligations in states where you owe nothing.
2. Gather your documents. You need your Employer Identification Number (EIN) or Social Security Number (SSN), business registration details, your North American Industry Classification System (NAICS) code, and banking information for remittance.
3. Apply through the state portal. Find the sales and use tax registration section on the state DOR website.
4. Receive your permit number and filing frequency. The state assigns how often you file, usually based on expected volume.

Most states charge nothing to register. A few charge a small fee, so verify the current figure against the state DOR if a fee applies. Third-party services such as Stripe Tax and Commenda can handle registration for you across multiple states.

How do you register in California (CDTFA)?

Apply through the California Department of Tax and Fee Administration online portal. California calls the document a seller’s permit and charges no fee to obtain it. The economic nexus threshold is $500,000 in combined sales delivered into California, with no transaction-count prong, effective for sales on or after April 1, 2019.

How do you register in Texas (Comptroller)?

Apply through the Texas Comptroller’s eSystems. Texas issues a Sales and Use Tax Permit (Form AP-201) with no fee. The economic nexus threshold is $500,000 in total Texas revenue over the preceding 12 months. Remote sellers who cross it must register by the first day of the fourth month after exceeding the amount.

Can You Register in Multiple States at Once with Streamlined Sales Tax?

Yes. The Streamlined Sales Tax Registration System (SSTRS) lets you register across the 24 Streamlined Sales Tax (SST) member states with one application. SST is a cooperative effort among states to standardize sales tax administration, and members include Georgia, Indiana, Michigan, Ohio, and Washington. Register through the Streamlined Sales Tax Governing Board.

There is a tradeoff. Registering everywhere through SSTRS creates a filing obligation in every one of those states, including zero-sales returns. Register only where you actually have nexus.

How Do You Verify a Sales Tax Permit?

Verify a permit through the issuing state’s online lookup tool. Enter the permit number and confirm the business name and address match. Sellers verify permits because accepting a resale certificate backed by an invalid permit can leave the seller liable for the uncollected tax. You can also use these tools to confirm your own permit is active after applying.

If a tool shows a permit as inactive or the details do not match, contact the state DOR before completing a tax-free sale.

What If You Have Nexus but Never Registered?

A Voluntary Disclosure Agreement (VDA) lets you come forward, register, and pay back taxes with a limited lookback period and reduced or waived penalties. It usually applies only if the state has not already contacted you. A VDA beats simply registering when your back liability is large, because registering directly can flag the unreported history without capping the lookback.

Weigh the cost. A VDA makes sense mainly when the penalty and interest savings outweigh the effort of setting one up. For small liabilities, historical registration may be simpler.

What Happens After You Get Your Sales Tax Permit?

The state assigns a filing frequency, usually monthly, quarterly, or annual based on volume, and you must file every period. Most states require a return even when you had zero sales. Registration is the start of an ongoing obligation, not the finish line.

Keep your permit current. Update it for changes in business structure, ownership, or location. Some states issue permits indefinitely, while others require periodic renewal, so confirm your state’s rule to avoid a lapse.

How Commenda Helps With Sales Tax Registration and Compliance

Commenda’s global indirect tax software tracks your physical and economic nexus across states, registers you where you actually need permits, and handles filing and remittance so you file on time and skip states you do not owe. Live threshold tracking flags when you approach a state’s limit, before an obligation surprises you.

For threshold detail, use the US nexus exposure guide, and for rate lookups use the sales tax calculator, which returns rates rather than nexus exposure. Commenda connects to your billing and accounting stack through 100+ ERP, API, and custom integrations, so marketplace and direct sales are separated automatically.

Book a demo to get a free nexus exposure assessment and see which states require you to register.