State wages on a W-2 are the portion of your annual pay that a particular state treats as taxable, and they appear in Box 16 of the form. The figure often looks close to your federal wages in Box 1, but it isn’t always the same number. States choose whether to follow federal rules on things like retirement contributions and pre-tax health premiums, and when they don’t, Box 16 drifts away from Box 1.
What Box 16 Actually Reports
Box 16 shows the total wages your employer counted as taxable for a given state during the year. It sits next to Box 15, which identifies the state and your employer’s state tax ID, and Box 17, which shows the state income tax withheld from your paychecks.
The wages counted in Box 16 include the usual categories of compensation: regular salary or hourly pay, bonuses, commissions, tips, overtime, and vacation pay. Certain non-cash benefits, like employer-provided meals or lodging, can also be included. These categories track closely with what the IRS considers wages for federal purposes.1Internal Revenue Service. Topic No. 401, Wages and Salaries
What sets Box 16 apart from Box 1 is what each state chooses to exclude, or refuses to exclude, before arriving at the taxable total.
Why Box 16 Doesn’t Match Box 1
If you’ve laid your W-2 flat and noticed that your state wages are higher or lower than your federal wages, the explanation almost always comes down to a small set of deductions that your state handles differently.
- Retirement contributions. Federal rules let you defer income tax on money you put into a 401(k), 403(b), or similar plan, so those contributions come out of Box 1. Most states follow that treatment, but some don’t. Pennsylvania, for example, taxes employee retirement plan contributions that the federal government lets you defer, which pushes Box 16 above Box 1.
- Cafeteria plan benefits. Under federal Section 125 rules, health insurance premiums and dependent care contributions you pay through an employer plan come out of your paycheck pre-tax. A few states don’t recognize that exclusion. New Jersey, for instance, still counts Section 125 health premiums as taxable state wages.
- State-specific additions or subtractions. Some states add back fringe benefits the federal code excludes, and some allow deductions the federal code doesn’t. Either can move Box 16 in either direction.
So a Box 16 figure that runs a few thousand dollars higher than Box 1 usually points to a state that taxes retirement or pre-tax benefit contributions. A Box 16 slightly below Box 1 usually points to a state-only subtraction. A gap by itself isn’t an error.
How State Wages Drive Your State Income Tax
Your Box 16 figure is the starting point for calculating what you owe the state. Forty-one states tax wage and salary income, with top marginal rates ranging from 2.5 percent in states like Arizona and North Dakota up to 13.3 percent in California.2Tax Foundation. State Individual Income Tax Rates and Brackets Fifteen states apply a single flat rate; twenty-six states and the District of Columbia use graduated brackets.
Nine states impose no income tax on wages at all: Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, and Wyoming.3USAFacts. Which States Have the Highest and Lowest Income Tax? Washington taxes long-term capital gains above a threshold but leaves wages alone.2Tax Foundation. State Individual Income Tax Rates and Brackets If you work in one of these states, you may still see something in Box 15 and Box 16 depending on how your employer reports, but you won’t owe state income tax on wages.
Each taxing state also has its own deductions and exemptions that reduce Box 16 before the rate applies. Some states start with your federal adjusted gross income and modify from there; others build state taxable income from the ground up. That’s why your state tax isn’t just your federal tax scaled to a different rate.
When Your W-2 Shows More Than One State
If you worked in more than one state during the year, expect to see a separate line for each state in Boxes 15 through 17. Some employers issue a separate W-2 form for each state instead. The wages in Box 16 for each state should reflect what you earned while working in (or, for residents, while living in) that state.
Two things to watch for in this situation. First, the state wages across multiple lines don’t have to add up to Box 1. A resident state may tax all of your wages while a work state taxes only the portion earned there, so double-counting on the form is normal and expected. Second, if you live in one state and work in another, check whether the two states have a reciprocity agreement. Under reciprocity, your employer withholds only for your home state and the work state stays off your W-2 in Boxes 15 through 17. About sixteen states and the District of Columbia participate, but only between specific pairs, so it doesn’t automatically apply to every border crossing.
Keep rough records of which days you worked where. If Box 16 for a work state looks wrong, that record is what lets you push back.
Fixing an Incorrect Box 16
Payroll mistakes do happen. An employer might allocate wages to the wrong state, miss a reciprocity election you filed, or apply the wrong treatment to a pre-tax deduction. If Box 16 looks off, start with your employer’s payroll department. They can issue a corrected form, called a W-2c, that supersedes the original.4Internal Revenue Service. About Form W-2c, Corrected Wage and Tax Statement
If your employer won’t cooperate past the end of February, you can call the IRS at 800-829-1040. The IRS will send your employer a letter requesting a corrected W-2 within ten days. If nothing comes of that either, the IRS can give you Form 4852, a substitute W-2 you complete using your final pay stub.5Internal Revenue Service. W-2 – Additional, Incorrect, Lost, Non-Receipt, Omitted Filing with estimated figures tends to draw closer scrutiny, so getting a proper W-2c is worth the effort if you can get one.
Before you assume Box 16 is wrong, though, run through the usual suspects: retirement contributions, cafeteria plan premiums, and any state-specific add-backs. In the vast majority of W-2s where Box 1 and Box 16 don’t match, one of those is the reason, and the form is doing exactly what it should.