Where Is State Tax Withheld on a W-2: Boxes 15, 16, and 17

State income tax withheld from your paycheck appears in Box 17 of Form W-2, at the bottom of the form. Box 17 sits inside a three-box cluster: Box 15 names the state and lists your employer’s state tax ID, Box 16 shows your state taxable wages, and Box 17 shows the total state income tax your employer withheld during the year. Those three numbers are what you carry over when you file your state return.

Reading Boxes 15, 16, and 17

The bottom strip of the W-2 is reserved for state and local reporting, while the boxes above it deal with federal wages and taxes.¹ Here is what each of the three state boxes contains.

Box 15 shows a two-letter state abbreviation (such as CA or NY) followed by your employer’s state-assigned identification number. The state uses that ID to match your withheld tax to the right employer account.
Box 16 shows the portion of your compensation the state treats as taxable. It will not always match your federal wages in Box 1.
Box 17 shows the total state income tax withheld from your pay during the year. This is the figure you claim as tax already paid when you file your state return.

If all three boxes are blank, your employer most likely did not withhold any state income tax. That is normal in the nine states with no state income tax on wages: Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, and Wyoming.

Why Box 16 Often Does Not Match Box 1

Box 1 reports federal taxable wages. Box 16 reports state taxable wages. The two commonly differ because federal and state tax codes define taxable income differently. A few of the usual reasons:

Pre-tax transportation benefits. Certain employer-provided transit or parking benefits may be excluded from federal wages but taxed at the state level, or the reverse.
Retirement contributions. A handful of states tax employee 401(k) contributions even though those contributions reduce federal taxable wages. In those states, Box 16 will be higher than Box 1.
State-specific deductions or add-backs. Some states allow deductions the federal code does not, or add back items the federal code excludes.

A gap between Box 1 and Box 16 is not automatically an error. It usually just means two different rulebooks were applied to the same paycheck.

When You Worked in More Than One State

The W-2 has two rows at the bottom of Boxes 15 through 17, so a single form can carry state data for up to two states. Each row has its own state abbreviation, employer state ID, state wages, and state tax withheld. If you worked in more than two states during the year, your employer will issue an additional W-2 to cover the rest.¹ When you file, combine the entries across all your W-2s state by state.

Reciprocal Agreements

Some neighboring states have reciprocal tax agreements that simplify withholding for people who live in one state and work in another. Under a reciprocal agreement, your employer withholds income tax only for your home state, not the state where you physically work. If you are covered, your W-2 will typically show only your home state in Box 15 even though you commuted across a state line. About 16 states participate in at least one reciprocal agreement. If you are unsure whether one applies to you, ask your employer’s payroll department or your home state’s tax agency.

Remote Work

Remote workers generally owe state income tax where they physically perform the work, not where the employer’s office is located. If you work from home in one state for a company headquartered in another, the state in Box 15 should be the state where you sit.

A small number of states, including New York, Pennsylvania, Connecticut, Delaware, and Nebraska, apply a “convenience of the employer” rule. Under that rule, if you work remotely from another state for your own convenience rather than because your employer requires it, the employer’s state may still tax that income as though you earned it at headquarters. In that situation you could see two states listed on your W-2 and may need to file returns in both, though most states offer a credit that prevents full double taxation.

Local Tax Sits Just Below in Boxes 18 Through 20

Directly under the state cluster, Boxes 18 through 20 do the same job for local and city income taxes. Box 18 shows local wages, Box 19 shows the local income tax withheld, and Box 20 names the locality that imposed the tax. Like the state section, the form fits data for up to two localities, and any beyond that spill onto a second W-2.¹ Many W-2s show nothing here because many states have no local income tax.

If Box 15 Is Blank or Numbers Look Wrong

Occasionally Box 15 is blank or missing the employer’s state ID number. If your pay stubs show state tax was deducted during the year, a blank Box 15 is likely an error. Contact your employer’s payroll department and ask for a corrected W-2. Your final pay stub for the year often lists the state ID and can serve as a reference in the meantime. Some tax software will let you file with an incomplete state ID, but doing so may delay processing or bring follow-up questions from the state.

If you spot a wrong state abbreviation, incorrect state wages, or a Box 17 figure that does not match your pay stubs, your employer should issue a Form W-2c (Corrected Wage and Tax Statement). Form W-2c has a dedicated section for state corrections, with fields for Boxes 15, 16, and 17 that show both the previously reported and corrected amounts.¹

If your employer has not fixed the error by the end of February, you can ask the IRS for help. Call 800-829-1040 or visit a Taxpayer Assistance Center with your employer’s name and address and your Social Security number. The IRS will send your employer a letter requesting a corrected form within ten days.²

If the filing deadline is coming up and you still do not have a corrected W-2, you can file using Form 4852 (Substitute for Form W-2, Wage and Tax Statement). On Form 4852 you estimate your wages and withholding from the best information available, such as your final pay stub or a prior-year W-2 from the same employer, and you explain what you did to try to get the correct form.³ If a corrected W-2 later arrives with different numbers, file an amended return using Form 1040-X.²

1
Internal Revenue Service. 2026 General Instructions for Forms W-2 and W-3
2
Internal Revenue Service. W-2 – Additional, Incorrect, Lost, Non-Receipt, Omitted
3
Internal Revenue Service. Using Form 4852 When Missing the Form W-2 or 1099-R