Your sales tax ID number is printed on the registration confirmation your state sent when you signed up, on the permit displayed at your business, inside your account on your state’s tax portal, and at the top of every sales tax return you’ve filed. If none of those turn it up, your accountant almost certainly has it on file, and the state itself will retrieve it for you with some basic verification. One thing to rule out first: five states have no sales tax, so if you operate in Alaska, Delaware, Montana, New Hampshire, or Oregon, there is no sales tax ID to find.1Tax Foundation. State and Local Sales Tax Rates, 2026
What You’re Actually Looking For
A sales tax ID is the number your state assigned when you registered to collect and remit sales tax. It’s separate from the federal EIN the IRS issued you for income tax and payroll.2U.S. Small Business Administration. Get Federal and State Tax ID Numbers The complication is that states don’t agree on what to call it. Depending on where you registered, the same number might appear as a seller’s permit number, resale certificate number, state tax ID, certificate of authority number, or simply “Account ID.” When you scan documents and screens, look for any of those labels.
If you sell into multiple states, you may hold several of these numbers at once, one per state. Make sure you’re pulling the number for the state you actually need.
Start With Your Registration Confirmation
The fastest place to look is the confirmation you received when you first registered. States typically send both an email and a physical letter or certificate after registration is complete. Search your email for the name of your state’s revenue department, or for phrases like “sales tax registration,” “permit number,” or “certificate of authority.” Registrations completed online in the last several years almost always generated an email that’s still sitting in an inbox.
If you registered by mail or in person, the state mailed a physical confirmation letter with your new ID. It’s usually the cleanest document you’ll find showing the number by itself, so it’s worth digging through your business files for it.
Check the Permit at Your Business
Most states require the sales tax permit to be displayed at your place of business. If you have a storefront, the permit may already be posted near the register, at the entrance, or on an office wall. The number is printed near the top and labeled something like “Permit Number,” “Account ID,” or “Registration Number.”
Formats vary. Some states issue a formal certificate; others send a plain letter-sized printout. If the original has gone missing, most states let you print a replacement directly from your online account, and the replacement carries the same number as the original.
Log Into Your State’s Tax Portal
For most business owners this is the most reliable route. Nearly every state with a sales tax runs an online portal where you file returns, make payments, and manage your account, and your sales tax ID is displayed once you log in.2U.S. Small Business Administration. Get Federal and State Tax ID Numbers
Sign in with the credentials created during registration. Look for a link called “Account Summary,” “Registration Details,” or “Business Profile.” Your ID will appear next to your business name and address, usually under a heading like “Sales and Use Tax” or “Gross Receipts Tax.” Many state portals manage several tax types under one login, so confirm you’re reading the sales tax account and not a payroll or income tax number.
Lost your login? Every state portal has a password reset. You’ll typically need your EIN or the email address tied to the account. It’s faster than calling and usually takes a few minutes.
Pull Up a Past Sales Tax Return
Every sales tax return you’ve filed has the ID printed in the header, near your business name and the filing period. If you file electronically, copies live inside the state portal. If you file on paper, the copy you kept has the number at the top. Some states label the form ST-1; others use their own naming, but the account number is always one of the first fields.
Look in Your Accounting Software and Business Records
If you use QuickBooks, Xero, or a larger accounting system, the sales tax ID was entered during setup. In QuickBooks Online, for example, it lives in your sales tax settings, linked to your filing account. Open the tax configuration area of whatever software you use.
The number also tends to appear in other business records:
- Merchant account applications, since payment processors often collect it during setup.
- Resale certificates you’ve issued to suppliers to buy inventory tax-free.
- Business license renewal applications at the local level.
Ask Your Accountant
This is the step most people skip, and it’s often the fastest. If an accountant, bookkeeper, or CPA files your sales tax returns, they have the number on file; it’s a required field every time they submit a return for you. A quick email gets it back in minutes. The same goes for a registered agent or formation service that helped you register originally, since they typically keep copies of state correspondence.
Call the State
When nothing else works, the state that issued the number will retrieve it for you. Call the business registration or sales tax division of your state’s Department of Revenue or equivalent agency. Have identifying information ready: the business’s legal name, registered address, EIN, and possibly the Social Security number of a principal owner listed on the original application.
Most states resolve this in a single call. Some also offer secure messaging inside the portal if you can log in but can’t find the number on the screen. A few states require a written request for security reasons, which can add several business days.
One practical note: call early in the morning or midweek. State tax lines get jammed on Mondays, Fridays, and around filing deadlines.
If You Can’t Find One Because You Never Registered
If your search is coming up empty because you never actually registered, that’s a different situation. Selling taxable goods or services without a valid permit can bring penalties, back taxes, and interest on the uncollected amounts, and some states treat repeat or willful violations as a criminal offense.
Registration is usually straightforward, often free, and available online. You’ll generally need your EIN or Social Security number, your business structure, and the address where you’re operating.2U.S. Small Business Administration. Get Federal and State Tax ID Numbers Getting compliant sooner limits the financial exposure, and some states offer voluntary disclosure agreements that reduce penalties for businesses that come forward on their own.