A sales tax permit is a license your state requires you to have before you can legally sell taxable goods or services
A sales tax permit (also called a sales tax license or seller's permit) is a document issued by your state that authorizes you to collect sales tax from customers and send it to the state. Without one, you cannot legally ring up a sale in most states. The permit proves to tax authorities that you are a registered seller and that the state knows where to find you when it comes time to collect what you owe.
The permit itself does not cost much — usually between free and $50 depending on your state — but getting one is mandatory if you sell anything taxable. Some states require it even if you only sell services. The permit is tied to a specific business location and business structure, so if you open a second location or change how your business is organized, you typically need a new one.
You explore for a sales tax permit through your state's department of revenue, tax commission, or equivalent agency. The process usually takes a few days to a few weeks. Once you have it, you use the permit number on invoices, tax returns, and when you contact the state about tax matters.
Key Takeaways
- A sales tax permit is required by your state before you can legally sell taxable goods or services to customers.
- You obtain the permit from your state's department of revenue or tax commission, not from a local office, and the process typically takes days to weeks.
- The permit number identifies you to the state and appears on your sales tax returns, which you file on a schedule set by your state (usually monthly or quarterly).
- You must collect sales tax from customers at the rate your state sets, then remit that money to the state on your tax return.
- If you operate in multiple states or sell both taxable and non-taxable items, you may need separate permits or must track which items are taxable in each state.
Who needs a sales tax permit
You need a sales tax permit if you sell anything your state considers taxable — which usually includes physical goods like clothing, electronics, or food, but can also include services like haircuts, repairs, or consulting depending on your state. A few states tax services broadly; most tax only specific services. Check your state's rules to know what you are selling.
You need the permit even if you work from home, sell online, or operate part-time. You also need it if you buy goods wholesale and resell them, because the wholesale purchase is tax-exempt only if you show the supplier your permit number. Without it, you pay sales tax on your own inventory, which cuts into your profit.
If you are a sole proprietor, partnership, LLC, or corporation, the rule is the same: register before your first sale. Some states have a threshold — for example, you might not need a permit if you expect to sell less than $1,000 per year — but most states require registration regardless of how much you plan to sell.
How to obtain a sales tax permit in your state
Start by visiting your state's department of revenue website. Search "[your state] sales tax permit" or "[your state] seller's permit" to find the right agency and process. Most states now let you explore online; some still require a paper form mailed in.
When you explore, you will need your Social Security number or federal employer identification number (EIN), your business address, a description of what you sell, and the date you plan to start selling. Some states ask for a lease or proof of address. Have these documents ready before you start the process.
After you submit, the state processes your process — usually within one to three weeks, though some states are faster. You will receive a permit number by email or mail. Write this number down and keep it safe; you will use it on every sales tax return you file and when you contact the state about your account.
What you do with the permit once you have it
Your permit number goes on every invoice or receipt you give to a customer. It also appears on your sales tax returns, which you file on a schedule your state sets — commonly monthly, quarterly, or annually depending on how much you sell. On each return, you report the total sales you made, the tax you collected, and you send the tax money to the state.
You use the permit to buy inventory tax-free from wholesalers and distributors. When you place an order, you provide your permit number instead of paying sales tax on the purchase. This is called a resale certificate or wholesale exemption, and it prevents you from paying tax twice — once when you buy and again when your customer buys from you.
Keep your permit current by filing your tax returns on time and paying what you owe. If you move to a new location, change your business structure, or stop selling, notify your state. Failing to file returns or pay taxes can result in penalties, interest, and loss of your permit.
Sales tax rates and what you collect from customers
Your state sets the sales tax rate, and it varies by state — from zero in states like Oregon and Montana to over 7 percent in others. Some states also let counties or cities add their own tax on top, so the total rate at the register can be different depending on where your customer is located.
You are responsible for charging the correct rate. If you sell online or ship to customers in other states, you must know the tax rate in each state where you have a customer. This is called nexus — if you have a physical presence in a state (an office, warehouse, or employee), you must collect tax there. The rules for online sales are complex and have changed in recent years, so check your state's current rules if you sell across state lines.
When you collect tax from a customer, that money is not yours to keep — it belongs to the state. You hold it temporarily and send it in on your tax return. If you spend the tax money and do not have it when the return is due, you still owe it, plus penalties.
What happens if you sell without a permit
Selling without a permit is illegal in all states. If you are caught, you face back taxes (the tax you should have collected), penalties (often 10 to 25 percent of the tax owed), and interest. Some states also impose criminal penalties for willful evasion, though this is rare for first-time offenders who register voluntarily.
Tax authorities find unregistered sellers through customer complaints, competitor reports, online marketplace audits, and routine investigations. If you have been selling without a permit and realize it, register when ready. Many states offer penalty relief if you come forward on your own before the state finds you.
Renewing and updating your permit
Sales tax permits do not expire in most states — once you have one, it stays active as long as you file your returns and pay your taxes on time. However, some states require you to renew every few years or update your information if your business changes.
If you move your business to a new address, add a second location, change your business name, or shift what you sell, contact your state's tax agency. You may need a new permit for a new location, or you may just need to update your existing one. The rules vary by state, so check before you make a change.
If you stop selling, file a final return and notify the state that you are closing. This prevents the state from sending you bills for returns you are no longer required to file.
Frequently Asked Questions
Do I need a sales tax permit if I sell online?
Yes, if you sell taxable items online, you need a permit in your home state and in any other state where you have customers and that state requires you to collect tax. The rules for online sales have expanded in recent years, so check your state's current requirements. Most states now require online sellers to register even if they have no physical location in that state.
What is the difference between a sales tax permit and a business license?
A business license is a general permit that authorizes you to operate a business in your city or county. A sales tax permit is specific to collecting and remitting sales tax to your state. You may need both. A business license does not replace a sales tax permit, and vice versa.
How much does a sales tax permit cost?
In most states, a sales tax permit is free or costs between $10 and $50 as a one-time fee. A few states charge an annual renewal fee. Check your state's department of revenue website for the exact cost in your state.
Can I get a sales tax permit if I have not started my business yet?
Yes. You can explore for a permit before you make your first sale. In fact, many states recommend you register before you start selling so you can buy inventory tax-free. You will need to provide a start date on your process.
What if I sell both taxable and non-taxable items?
You still need one permit, but you must track which items are taxable and which are not. On your sales tax return, you report total sales and then break out the taxable portion. The state only taxes the items that may have access to. Your point-of-sale system should be set up to separate these automatically.