No, a sales tax number is not the same as an EIN. An Employer Identification Number is a federal tax ID issued by the IRS to identify your business for income, payroll, and excise tax purposes. A sales tax number is a state-issued permit that authorizes your business to collect sales tax from customers on behalf of that state. Different issuer, different purpose, and most businesses that sell taxable goods or services end up needing both.
The Short Answer, Side by Side
The two numbers get confused because both are “tax IDs” a business uses. They do not overlap in function.
- Who issues it. The IRS issues the EIN. Your state’s department of revenue (or equivalent agency) issues the sales tax number.
- What it covers. One EIN covers your federal tax identity for the whole country. A sales tax number covers one state, so a business with customers in multiple states may need several.
- What tax it’s tied to. The EIN attaches to taxes your business owes: income tax, payroll tax, and certain excise taxes. The sales tax number attaches to tax your customers owe at the register, which you collect and pass through.
- Whose money is at stake. Taxes reported under your EIN are your business’s own liability. Sales tax collected under a state permit is your customers’ money, held in trust until you remit it.
- Who needs one. Any corporation, partnership, or employer needs an EIN. A sales tax number is only needed by businesses selling taxable goods or services in a state where they have nexus.
What the EIN Does
An EIN is a nine-digit number the IRS assigns to businesses and other entities for tax filing and reporting.1Internal Revenue Service. About Form SS-4, Application for Employer Identification Number (EIN) It functions like a Social Security Number for the business itself and appears on every federal return the business files.
You generally need an EIN if you:2Internal Revenue Service. Get an Employer Identification Number
- Hire employees and have to report withheld taxes.
- Operate as a corporation or partnership, regardless of whether you have employees.
- Pay excise taxes on goods like alcohol, tobacco, or fuel.
- Change your business structure, for example converting a sole proprietorship to an LLC.
- Administer a trust, estate, or retirement plan.
A sole proprietor with no employees can technically use a personal Social Security Number on federal returns, but many get an EIN anyway to keep business and personal finances separate. Banks typically require one to open a business checking account. There is no fee for the EIN itself, and domestic applicants with a valid taxpayer identification number can receive their number immediately through the online application at IRS.gov/EIN.3Internal Revenue Service. Instructions for Form SS-4
What a Sales Tax Number Does
A sales tax number is a state-level identifier that lets your business collect sales tax legally. Depending on the state, it may be called a seller’s permit, a sales tax permit, or a sales and use tax registration number. The name changes; the job doesn’t. It establishes your business as an authorized collection agent for state tax revenue.
Forty-five states plus the District of Columbia impose a statewide sales tax. The five that don’t are Alaska, Delaware, Montana, New Hampshire, and Oregon, though some local jurisdictions in Alaska levy their own. Rates, rules, and exemptions vary state to state, which is why a business selling nationwide can end up managing registrations in many jurisdictions at once.
You register through the state’s department of revenue, usually online. The application typically asks for your federal EIN, business address, what you sell, and expected sales volume. Some states charge a small fee; many issue permits at no cost. The EIN is often a prerequisite for the state application, which is one reason it usually makes sense to get the federal number first.
Resale Certificates
A registered seller can use a resale certificate to buy inventory tax-free from suppliers. The tax gets collected later, from the end customer, so the same item isn’t taxed twice on its way through the chain. Using a resale certificate to buy items for personal use is treated as fraud, with fines commonly based on the tax that should have been paid, and criminal exposure for repeated or serious misuse.
When You Might Need One but Not the Other
The two numbers answer different questions, so having one doesn’t get you the other.
A single-member LLC with no employees selling handmade goods at in-state craft fairs needs a state sales tax permit but may not need an EIN, since the owner can file federal taxes under a Social Security Number. A consulting corporation that sells only nontaxable professional services needs an EIN for federal purposes but generally has nothing to register for on the sales tax side. A retailer with employees and taxable products needs both, and often several sales tax numbers if it has nexus in more than one state.
Neither number substitutes for the other on paperwork. Putting an EIN in a sales tax field, or vice versa, creates mismatches that delay processing on both ends.
Why the Difference Matters When Things Go Wrong
The cleanest way to see why these are separate systems is to look at what happens when a business doesn’t pay.
On the federal side, if a business withholds payroll taxes and fails to send them to the IRS, the agency can assess the Trust Fund Recovery Penalty against any individual who was responsible for collecting and paying over those taxes and willfully failed to do so. The penalty equals the full amount of the unpaid tax.4Office of the Law Revision Counsel. 26 U.S. Code 6672 – Failure to Collect and Pay Over Tax, or Attempt to Evade or Defeat Tax “Responsible person” is defined broadly and can include officers, partners, or employees with check-signing authority.5Internal Revenue Service. Trust Fund Recovery Penalty
The state side works on the same principle for a different tax. Sales tax collected from customers is held in trust for the state. If the business doesn’t remit it, most states can hold individual owners or officers personally liable for the missing funds. Specifics vary, but the underlying rule is nearly universal: collected sales tax is not the business’s money, and using it as working capital is one of the fastest ways to create personal tax debt, which in many jurisdictions survives bankruptcy.
Filing frequency also runs on separate tracks. Federal employment tax returns follow the IRS calendar, with Form 941 due each quarter even in periods with no tax to report unless you’re a seasonal employer or filing a final return.6Internal Revenue Service. Instructions for Form 941 (Rev. March 2026) Each state assigns its own sales tax filing frequency, usually based on collection volume, and requires a return for every period even when taxable sales were zero. A skipped zero-dollar return is treated the same as a missed filing.
Closing Out Both Accounts
Because the two numbers live in different systems, closing a business means closing both accounts separately. Neither happens automatically.
To close the federal side, you send the IRS a letter that includes the business’s legal name, EIN, address, and reason for closing, along with a copy of the original EIN assignment notice if you have it. The account stays open until all required returns are filed and all taxes are paid. The EIN itself is never reissued to another entity.7Internal Revenue Service. Closing a Business
On the state side, you cancel your sales tax permit with each state where you’re registered, usually by filing a final return, remitting any remaining collected tax, and submitting a closure request. Skipping this step leaves you exposed to filing obligations and non-filing penalties long after the business has stopped operating. Buyers of an existing business should also check for unpaid sales tax before closing, because many states apply successor liability and let the prior owner’s debts follow the business.