The state/payer’s state number on your W-2 or 1099 is the identification number a state tax agency assigns to your employer or payer so it can track the state income tax withheld from your pay. On a W-2 you’ll find it in Box 15, printed next to your state’s two-letter abbreviation. It functions at the state level the way a federal Employer Identification Number functions federally, and every state issues its own version with its own format.
Where to Find It on Your W-2
Box 15 is the spot. It sits in the state and local section of the form (Boxes 15 through 20), which also carries your state wages in Box 16 and state income tax withheld in Box 17.1Internal Revenue Service. General Instructions for Forms W-2 and W-3 (2026) The entry pairs the two-letter state code with the employer’s state ID for that state.
If you worked in more than one state, Box 15 can show entries for up to two states, separated by a broken line. When wages came from three or more states, your employer should issue a second W-2 covering the extra states.1Internal Revenue Service. General Instructions for Forms W-2 and W-3 (2026) Each line carries its own abbreviation, state ID, state wages, and withholding.
Not seeing it? Check a recent pay stub. Many employers print state withholding details on each stub, often near the company information or inside a tax breakdown. If it’s not there either, call your employer’s payroll or HR department and ask.
Where It Appears on a 1099
The number isn’t unique to W-2s. If you received freelance, contract, or other income reported on a 1099, the payer’s state number shows up on that form too whenever state tax was withheld. The IRS instructions tell payers reporting state withholding to enter “the abbreviated name of the state and the payer’s state identification number” in the designated state box.2Internal Revenue Service. Instructions for Forms 1099-MISC and 1099-NEC (04/2025)
The box differs by form. On Form 1099-NEC it’s Box 6. On Form 1099-MISC it’s Box 17. Other 1099 variants put it in a different numbered box, but the purpose is identical: it tells the state which payer sent in the withholding so the credit matches your return.
What If Box 15 Is Blank?
Nine states don’t tax wage income: Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, and Wyoming. If you worked only in one of these, Box 15 will usually be empty because there’s nothing to withhold or report at the state level, and no state withholding account number exists.
If you earned wages in both a taxing state and one of these nine during the same year, only the taxing state’s line will appear in Boxes 15 through 17. That blank space is often the first thing people notice after moving from a no-tax state or picking up remote work for an out-of-state employer.
Why the Number Matters When You File
When you file a state return, the state uses the payer’s state number to match the withholding your employer sent in with the credit you’re claiming. If the number is wrong or missing, the state may not be able to confirm the money was actually remitted on your behalf. The usual consequences are a delayed refund or a letter asking you to verify the withholding.
Most state return software and paper forms have a field for this number. It works like a routing number on a check: the dollar amount can be perfectly correct, but without the right identifier the payment can’t be matched to the right account. Entering it correctly the first time avoids the back-and-forth.
If the Number Is Missing or Wrong
Ask Your Employer for a Corrected W-2
Start with payroll or HR. Explain the problem and request a correction. Employers issue corrections on Form W-2c, the Corrected Wage and Tax Statement, which the Social Security Administration tells employers to file “as soon as possible after you discover an error.”3Social Security Administration. Helpful Hints to Forms W-2c/W-3c Filing A W-2c can fix any field on the original form, including the Box 15 state ID.4Internal Revenue Service. About Form W-2 C, Corrected Wage and Tax Statements
Use Form 4852 If the Employer Won’t Fix It
Sometimes an employer is unreachable, has closed, or simply won’t issue a correction. The IRS lets you file Form 4852 as a substitute for a missing or incorrect W-2.5Internal Revenue Service. About Form 4852, Substitute for Form W-2, Wage and Tax Statement, or Form 1099-R You estimate wages and withholding from the best records you have, usually a year-end pay stub with year-to-date totals. If you had the same employer the prior year and your pay was essentially unchanged, the IRS says a prior-year W-2 can anchor your estimates.6Internal Revenue Service. Using Form 4852 When Missing the Form W-2 or 1099-R
Form 4852 asks you to describe what you did to get the missing form, so document your attempts to reach the employer before switching to estimates. Filing on time with reasonable estimates is better than waiting past your deadline for a correction that may never come.