A seller’s permit and a sales tax permit are the same document. States use different names for the same authorization: the paper that registers your business to collect sales tax from customers and send it to the state. Whether your state calls it a seller’s permit, a sales tax permit, a sales tax license, a Certificate of Authority, or a vendor’s license, the legal function is identical.
Why the Names Differ
Every state that imposes a sales tax requires businesses making taxable sales to register with the state’s tax agency. What that agency prints on the document depends on where you are:
- California calls it a seller’s permit.
- New York and New Jersey call it a Certificate of Authority.
- Ohio issues a vendor’s license.
- Indiana hands you a Registered Retail Merchant Certificate.
- Arizona calls its version a transaction privilege tax license.
- Hawaii uses a general excise tax license.
- New Mexico ties registration to a gross receipts tax number rather than using a traditional sales tax label.
You will also see “sales and use tax permit” and “retail license” in various states. None of these differences change what the document does. Register with the state, charge the right amount of tax on taxable sales, remit it on the state’s schedule. That is the entire job of the permit, whatever it is called.
What the Permit Actually Authorizes
The permit registers your business as a sales tax collector. It gives you the legal authority to add sales tax to a customer’s bill, hold that money in trust for the state, and forward it when your return is due. Without the permit, you have no authority to collect the tax, and you have no legal basis for the customer to pay it to you.
That single function is why the naming variation is not a real distinction. A California seller’s permit and a Connecticut sales tax permit both do the same thing inside their respective states. If you operate in more than one state, you register in each one and receive whatever document that state issues.
The Document People Actually Confuse It With
The genuine mix-up is not between a seller’s permit and a sales tax permit. It is between either of those and a resale certificate. These are two different documents with opposite purposes.
Your seller’s permit (or sales tax permit) authorizes you to collect sales tax from your customers.
A resale certificate lets you avoid paying sales tax when you buy inventory you plan to resell. You give the certificate to your supplier, which tells them not to charge you tax because you will charge your customer tax when you sell the item. Without it, tax would be paid twice on the same goods: once when you buy them, again when your customer buys them from you.
In many states, registering for the sales tax permit automatically assigns you the number you use on resale certificates, which is part of why the two get conflated. They are still different instruments doing different jobs. A resale certificate is only valid for items you truly intend to resell. Using one to buy office furniture, supplies for your own use, or personal items is tax fraud, and auditors look for exactly that.
States Where You Do Not Need Either
Alaska, Delaware, Montana, New Hampshire, and Oregon do not impose a general statewide sales tax. A business operating only in one of these states, and shipping nothing to customers elsewhere, has no sales tax to collect and no permit to obtain. Some Alaska localities levy their own local sales taxes, so businesses there should check with the borough or city. And if you sell into states that do have a sales tax, you may still need to register in those states.
When You Need to Register
In the other 45 states and the District of Columbia, you need a permit whenever your business makes taxable sales of goods or certain taxable services. Tangible products like clothing, electronics, and furniture are taxable nearly everywhere. Services are treated less uniformly: four states tax most services by default, while the other 41 tax only services their statutes specifically list. Professional services such as legal and accounting work are rarely taxed. Repair work, landscaping, and personal grooming services are taxed more often. Your state department of revenue publishes the list.
The trigger for registration is nexus, meaning a connection to the state strong enough that the state can require you to collect its tax. Nexus comes in two forms.
Physical Nexus
You have physical nexus in a state if your business has a tangible footprint there: an office, a retail store, a warehouse holding inventory, or employees working in the state. Temporary activities can also count. Attending a trade show and taking orders creates nexus in some states, and storing inventory in a third-party fulfillment center, including Amazon warehouses, counts in many states.
Economic Nexus
Since the Supreme Court’s 2018 decision in South Dakota v. Wayfair, states can require sales tax collection from businesses with no physical presence at all, based on sales volume alone. The Court upheld a South Dakota law setting the threshold at $100,000 in annual sales or 200 separate transactions delivered into the state.1Supreme Court of the United States. South Dakota v. Wayfair, Inc. (06/21/2018) The $100,000 figure became the standard. Over 40 states now use it, though some have dropped the 200-transaction alternative. Texas and California set their threshold higher at $500,000. An online seller shipping to customers around the country can cross these thresholds without ever leaving home.
How to Apply, Whatever Your State Calls It
Applying is free in most states, though a few charge a small fee, typically under $100. You apply through the state’s department of revenue, department of taxation, or equivalent agency, and most states run the application online. You will need:
- Your legal business name, any DBAs, and physical address
- Your EIN, or your Social Security Number if you are a sole proprietor
- Your business structure (sole proprietorship, LLC, partnership, corporation)
- A description of what you sell, your expected start date for taxable sales, and estimated monthly revenue
Some states issue the permit number immediately at the end of the online application. Others take a few business days or ask for additional documentation before approving you.
If you sell into many states, the Streamlined Sales Tax Registration System (SSTRS) lets you register in the 24 member states through a single free online portal.2Streamlined Sales Tax. Sales Tax Registration SSTRS You still file returns with each state separately, but the registration step happens in one place. States outside the agreement require direct registration.
The Practical Takeaway
If a form, a landlord, a supplier, or a marketplace asks for your “sales tax permit” and your state issued you a “seller’s permit,” you have the right document. Same for the reverse. Give them the number the state printed on whatever it sent you. The only document you should not confuse with the permit is a resale certificate, which is a separate item you use as a buyer, not as a seller. Get the permit before your first taxable sale, and use the name your state uses when you file.