Your employer payroll tax account number is on the registration letter your state mailed when you first signed up for payroll taxes, on any quarterly return you’ve already filed, and inside your state’s online employer portal. If none of those turn it up, call the state agency that issued it and they’ll give it to you after verifying your identity. One wrinkle worth knowing before you start hunting: many states issue two numbers, one for income tax withholding and one for unemployment insurance, so you may be looking for more than one.
Start With the Registration Paperwork
The most direct source is the confirmation letter or registration certificate your state revenue department mailed after you first registered. It’s sometimes labeled a “welcome” letter or a registration notice, and it lists the assigned account number you’ll use on every future filing.
If that letter is gone, look for the annual unemployment insurance rate notice from your state labor or workforce agency. These arrive early in the calendar year and show the tax rate assigned to your business based on claims history, with the account number printed alongside it. Payment coupons and any delinquency notices the state has sent you will also carry the number.
Check Prior Filings and Payroll Reports
Quarterly withholding returns and unemployment insurance reports both require the account number near the top of the form, so any prior filing will show it in the header. Pull a recent quarter and the number is right there with the wage totals.
If a payroll provider handles your taxes, the account number sits in the tax packages they generate after each pay cycle. Year-end summaries and quarterly reconciliation reports both show the specific number used to transmit funds on your behalf.
Log In to the State Employer Portal
Nearly every state runs an online employer portal through its revenue department or workforce agency. Once you log in, the account number typically shows on the main dashboard or in a business profile section. If you set up online access at registration, those credentials should still work.
Inside the portal, look for a page called something like “Account Summary” or “Tax Account Details.” Many portals let you download a fresh copy of the original registration certificate, and your recent payment history will display next to the account number so you can confirm it matches what you’ve used on past filings.
Call the State Agency
When records and online access both fail, call the agency that issued the number. Before you dial, have your Federal Employer Identification Number, your business’s legal name exactly as it appears in state records, and the owner’s Social Security number ready — agents won’t share account details until they verify who you are.
Wait times spike around quarterly filing deadlines and can stretch past an hour. Once verified, the agent can read the number over the phone or mail a replacement registration notice. If your state offers secure messaging through its portal, that’s often faster than the phone queue.
You May Have Two Different Numbers
In many states, income tax withholding is administered by the department of revenue while unemployment insurance is handled by a separate labor or workforce agency, and each issues its own identifier. So when someone asks for your “payroll tax account number,” find out which one they mean.
Other states issue a single number that covers all payroll obligations, including withholding, unemployment insurance, and disability insurance where it applies. Check your registration documents or portal to see whether you have one number or two. When you’re switching payroll software or onboarding a new provider, you’ll usually need to hand over both, so confirm you have each before the changeover.
This Is Not Your Federal EIN
Your state payroll tax account number and your federal EIN are separate identifiers. The EIN is a nine-digit number issued by the IRS for federal tax filings, banking, and licensing.1U.S. Small Business Administration. Get Federal and State Tax ID Numbers Your state account number is issued by a state agency and used only for state payroll obligations like withholding and unemployment insurance. If it’s the EIN you’ve actually lost, the IRS has its own recovery process: check the original IRS assignment notice, your bank, or past federal returns, or call the IRS Business and Specialty Tax Line at 800-829-4933.2Internal Revenue Service. Employer Identification Number
Don’t Miss a Deadline While You’re Looking
A missing account number isn’t a defense against a late deposit. The IRS charges 2 percent on deposits one to five days late, 5 percent for six to fifteen days late, and 10 percent beyond fifteen days. If the amount is still unpaid more than ten days after the IRS sends a delinquency notice, the penalty rises to 15 percent.3Internal Revenue Service. Publication 15 – Employers Tax Guide State penalties generally work the same way, adding a percentage of unpaid tax each month plus interest. Federal law also lets the IRS hold owners, officers, or other responsible persons personally liable for employment taxes withheld from employees but not paid over to the government.4Office of the Law Revision Counsel. 26 USC 6672 – Failure to Collect and Pay Over Tax, or Attempt to Evade or Defeat Tax
If a deadline is closing in and you still can’t find your number, call the agency and say so. Most will help you file or pay while they retrieve the number rather than letting the account fall into delinquency.