A sales tax license is a permit your state requires you to hold before you can legally sell taxable goods or services
A sales tax license (also called a sales tax permit, seller's permit, or resale certificate depending on your state) is an official document that authorizes you to collect sales tax from customers on behalf of your state. Without one, you cannot legally ring up a sale in most states. The license tells tax authorities that you exist, where you operate, and that you understand your obligation to collect and send in the tax money you gather.
The license itself does not cost much — usually between $0 and $50 — but getting one is mandatory in most states if you sell anything taxable. Some states require it even if you sell only services. A few states have no sales tax at all (Alaska, Delaware, Montana, New Hampshire, and Oregon), so businesses there do not need one. But if you operate in any other state, you need to register before your first sale.
Key Takeaways
- A sales tax license is required by most states before you can legally sell taxable goods or services, and you must register before your first sale.
- You obtain a sales tax license from your state's Department of Revenue or equivalent tax agency, usually through an online portal or by mail.
- The license tells you your sales tax account number and the tax rate you must charge in your jurisdiction, which varies by location and product type.
- Once licensed, you collect sales tax from customers, file returns on a schedule set by your state (monthly, quarterly, or annually), and send the collected tax to the state.
- Operating without a license can result in back taxes, penalties, and interest, so registering early is cheaper than fixing it later.
How to get a sales tax license in your state
The process starts with your state's Department of Revenue, Department of Taxation, or equivalent agency — the name varies by state. Most states now let you register online through a portal on their tax website. You will need your Social Security number or Employer Identification Number (EIN), your business address, a description of what you sell, and the date you plan to start selling.
Some states bundle the sales tax license with other registrations. For example, you might register for sales tax, income tax withholding, and unemployment insurance all in one process. A few states still accept paper applications by mail, though online is faster. Once you submit, you typically receive your license number within a few days to a few weeks, depending on the state and whether they need to verify information.
If you operate in more than one state, you need a separate license in each state where you have sales. An online business that ships nationwide, for example, may need licenses in multiple states — the rules about which states require this have shifted in recent years, so check with each state's tax authority about their specific rules.
What your license tells you about tax rates and what you must charge
Your sales tax license comes with information about the tax rate you must charge in your location. That rate is not the same everywhere. A state might have a base rate of 5%, but a county or city within that state might add another 1% or 2%, making the total 6% or 7%. Some products are taxed at different rates — groceries might be exempt or taxed at a lower rate than clothing, for example. Your license documents spell out which rate applies to what you sell.
You are responsible for charging the correct rate. If you charge too little, you owe the difference to the state. If you charge too much, you may have to refund customers or send the overage to the state. The license itself does not calculate the tax for you — you do that at the point of sale, either by hand or through your cash register or e-commerce platform.
Filing sales tax returns and sending in the money you collected
Once you have a license, you must file returns on a schedule set by your state. Some states require monthly returns, others quarterly, and a few allow annual returns for very small businesses. You report the total sales you made, the tax you collected, and you send the tax money to the state. The return itself is usually filed online through the same portal where you registered.
The money you collect in sales tax is not your money — it belongs to the state. You are holding it temporarily. If you spend it or fail to send it in, you are liable for it personally, even if your business closes. This is one of the most common mistakes new business owners make: treating sales tax as income rather than as a liability.
Your state will tell you the due date for each return. Missing a important date can result in penalties and interest, which compound over time. If you are unsure when your return is due, check your state's tax website or call the tax agency directly.
The difference between a sales tax license and a resale certificate
A resale certificate is different from a sales tax license, though the terms are sometimes confused. A resale certificate is a document you give to a supplier when you buy goods that you plan to resell. It tells the supplier that you are a licensed business and will collect sales tax from your customers, so the supplier does not need to charge you sales tax on that purchase. You need a sales tax license before you can get a resale certificate.
For example, if you own a clothing store, you show your resale certificate to the manufacturer when you buy inventory. The manufacturer sells to you without charging sales tax. You then charge sales tax when you sell that clothing to a customer. Without the resale certificate, the manufacturer would charge you sales tax, and then you would charge sales tax again to your customer — double taxation.
What happens if you operate without a license
Operating without a sales tax license is illegal in most states. If you are caught, the state can assess back taxes (the sales tax you should have collected), plus penalties and interest. The penalties are often steep — 10% to 25% of the unpaid tax, depending on the state and whether the violation was intentional. Interest compounds monthly, so the longer you wait to register, the more expensive it becomes.
The state can also revoke your business license or prevent you from obtaining one. Some states pursue criminal charges for willful evasion, though that is rare for first-time violations. The simplest approach is to register before you make your first sale. If you have already been selling without a license, contact your state's tax agency and ask about voluntary disclosure — many states offer reduced penalties if you come forward on your own.
How to renew or update your sales tax license
Sales tax licenses do not expire in most states, but you must keep your registration current. If you move your business, change what you sell, or add a location, you need to notify the tax agency. Some states require you to file a renewal form every few years even if nothing has changed. Check your state's tax website for renewal requirements and important date.
If you close your business, you must notify the tax agency so they stop expecting returns from you. Failing to do so can result in penalties for missed filings. When you close, you also need to file a final return showing any remaining sales tax owed.
Frequently Asked Questions
Do I need a sales tax license if I sell online or from home?
Yes, if you sell taxable goods or services, you need a license regardless of where you operate. An online business, a home-based business, and a brick-and-mortar store all require one. The location does not matter — the fact that you are making sales does.
What if I sell services instead of products?
It depends on your state and the type of service. Some states tax services, others do not. A few states tax only certain services — for example, labor on repairs but not consulting. Check your state's tax agency website or call them to find out whether your specific service is taxable in your state.
Can I use my sales tax license to buy inventory without paying sales tax?
Yes, but you need a resale certificate, not just the license. A resale certificate is a separate document you provide to suppliers to show you are buying for resale. Your license number is part of that certificate. Ask your suppliers for their resale certificate form or provide them with your license number and they will handle it.
How long does it take to get a sales tax license?
Most states issue licenses within a few days to two weeks if you register online. Paper applications take longer, sometimes three to four weeks. Some states issue the license when ready upon submission, while others verify your information first. Check your state's tax website for their typical processing time.
What if I have a business in multiple states?
You need a separate sales tax license in each state where you have sales. The rules about which states require this have changed in recent years, especially for online sellers. Contact each state's tax agency to find out their specific rules for your type of business.