Why Are My State Wages Lower Than Federal: Box 1 vs Box 16

If you’re wondering why are my state wages lower than federal wages on your W-2, the short answer is that your state defines taxable income differently than the IRS does. Box 1 captures every dollar of taxable compensation your employer paid you. Box 16 only captures what your state chooses to tax, and that number shrinks whenever you worked in more than one state, live somewhere with no income tax, benefit from a reciprocity agreement, or receive pay your state specifically excludes.

What Box 1 and Box 16 Actually Measure

Box 1 reports your total taxable wages, tips, and other compensation for federal income tax purposes.¹ It includes almost everything your employer paid you during the year, less pre-tax items like 401(k) contributions and health insurance premiums. Geography does not affect it.

Box 16 reports the wages your state considers taxable under its own rules.² Every state writes its own tax code, with its own exclusions and sourcing rules, so Box 16 can be lower than Box 1, higher than it, or identical. When it’s lower, one of the situations below is almost always the reason.

You Worked in More Than One State

This is the most common cause of a large gap. If you relocated mid-year or traveled between states for work, your employer splits your earnings by where the work happened. Box 1 still shows your full annual compensation because the federal government taxes all of it.¹ Box 16 on each state’s W-2 only shows the portion you earned while working in that state.

When no reciprocity agreement applies, employers usually allocate wages using a days-worked formula: the days you worked in a state divided by your total working days, applied to your total pay. Each state’s Box 16 comes out to a fraction of Box 1. If a state ever questions the split, a calendar or log of where you worked each day is your best defense.

Reciprocity Agreements

Nearly half the states that impose an income tax have reciprocity agreements with at least one neighbor. Under these agreements, your work state agrees not to tax your wages if your home state does the same for its residents working there. If you live in one state and commute to a reciprocal state, the work state’s Box 16 may show zero because that state has waived its right to tax you. Your home state’s Box 16 would then carry your full earnings.

Reciprocity only covers wage income, and you generally need to file an exemption form with your employer to opt in. Common pairs include Illinois and Iowa, Virginia and the District of Columbia, and Ohio and several of its neighbors. If your employer withheld work-state tax anyway, you can file a nonresident return in that state to recover the withholding.

You Live in a State With No Income Tax

Nine states impose no individual income tax: Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, and Wyoming. If you live and work only in one of these, Box 16 will typically be blank or zero while Box 1 shows your full federal wages. That contrast can look alarming but requires no action.

If you moved between a taxing state and a non-taxing state during the year, you may get two W-2s, or one W-2 with state information only for the taxing state. The no-tax state simply has no need for a Box 16 entry.

Military Pay Your State Excludes

Active-duty pay is included in Box 1 as federally taxable wages under the general definition of wages in the tax code.³ Many states, however, exclude some or all military pay from state taxable income. Some exempt all active-duty pay regardless of duty station; others exempt a fixed dollar amount or limit the benefit to service members who maintain legal residency in the state.

Combat zone pay is separately excluded federally and so does not appear in Box 1 either, meaning it doesn’t create a gap. The gap shows up when a state exempts pay the federal government still taxes, such as a state that exempts the first $15,000 or $20,000 of active-duty pay. Box 1 reflects the full amount; Box 16 subtracts what the state carves out.

Mandatory Pension Contributions

Mandatory contributions to state and local government pension systems are a frequent source of a Box 1–versus–Box 16 gap. Federal regulations treat any amount deducted from your paycheck as part of your wages for federal purposes, even when a state law requires the deduction.⁴ So your mandatory pension deduction stays in Box 1. Many states, though, treat the same contributions as pre-tax for state purposes, which pulls them out of Box 16.

A related mechanism is the “pick-up” contribution under Section 414(h)(2) of the Internal Revenue Code. When a government employer formally assumes responsibility for contributions technically designated as employee contributions, the IRS treats them as employer contributions and excludes them from federal gross income.⁵ Those dollars may then be excluded from both Box 1 and Box 16, producing no gap. The gap appears when the pension system doesn’t use the pick-up election.

For the pick-up to qualify, the employer must take formal action designating that it will pay the contributions in lieu of employee contributions, and employees cannot have the option to take the money as cash instead.⁵ If you’re a public employee and the pension deduction seems to explain your Box 16 gap, ask your retirement system whether a pick-up election is in place.

Fringe Benefits Your State Treats Differently

Some non-cash compensation the IRS taxes may be partly or fully excluded at the state level.

Group-Term Life Insurance

Employer-provided group-term life insurance is tax-free federally up to $50,000 of coverage. Coverage above that threshold produces “imputed income,” a calculated cost the IRS adds to Box 1.⁶ A handful of states don’t include this imputed amount in state wages, lowering Box 16 by whatever the imputed figure is. The dollar impact is usually modest but is a common source of a small discrepancy.

Educational Assistance

Federal law excludes up to $5,250 per year in employer-provided educational assistance from your taxable wages.⁷ Tuition reimbursement above that cap goes into Box 1 as taxable pay. If your state offers a higher cap or broader exemption, your employer will reduce Box 16 by the extra excluded amount.

How To Tell if the Gap Is an Error

Not every difference between Box 1 and Box 16 is intentional. Payroll mistakes happen, and a miscoded deduction or wrong state code can produce a Box 16 figure that’s genuinely wrong. Before filing, compare your W-2 to your final pay stub of the year. Your year-to-date gross, pre-tax deductions, and any items flagged as non-taxable on the stub should reconcile with the W-2. If they don’t, contact your employer’s payroll department before you file.

If payroll confirms an error, the employer is required to issue a corrected form called a W-2c.⁸ Don’t just override Box 16 on your state return without a corrected W-2 to back it up. States cross-check wage data employers report against what taxpayers enter, and a mismatch can trigger an automated notice.

If your employer won’t correct the form or you can’t reach them, contact the IRS at 800-829-1040 and file Form 4852 (a substitute W-2) with your federal return. For state purposes, check with your state tax agency; many accept Form 4852 or offer their own substitute wage form. Keep pay stubs, employment records, and any correspondence with your employer in case either the IRS or your state follows up.

1
Internal Revenue Service. 2026 General Instructions for Forms W-2 and W-3 – Section: Box 1
2
Internal Revenue Service. 2026 General Instructions for Forms W-2 and W-3 – Section: Boxes 15 Through 20
3
Office of the Law Revision Counsel. 26 U.S.C. 3401 – Definitions
4
eCFR. 26 CFR 31.3401(a)-1 – Wages
5
Internal Revenue Service. Employer Pick-Up Contributions to Benefit Plans
6
Office of the Law Revision Counsel. 26 U.S.C. 79 – Group-Term Life Insurance Purchased for Employees
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Office of the Law Revision Counsel. 26 U.S.C. 127 – Educational Assistance Programs
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Internal Revenue Service. About Form W-2 C, Corrected Wage and Tax Statements