What Are State Payroll Taxes?

Key takeaways

• State income tax withholding is a prepayment toward an employee’s state income tax, not an extra fee kept by the employer.
• Some states also fund paid leave, disability, or unemployment programs partly through employee payroll deductions.
• Many state payroll taxes are employer-only and should not reduce employee take home pay.
• Work location, residence, reciprocity, and remote-work rules can affect which state appears on a pay stub.

State income tax withholding

In states that tax wage income, an employer may withhold state income tax from each paycheck and send it to the state tax agency. The calculation can depend on taxable wages, pay frequency, the state withholding certificate, filing status, allowances or credits, and any extra amount requested by the employee.

Withholding is not necessarily the employee’s final state tax bill. The amount withheld during the year is generally reconciled on a state return, when required. Too little withholding may leave a balance due; too much may contribute to a refund. State systems do not always mirror the federal Form W-4, so changing a federal certificate may not update state withholding.

Other state deductions that may appear

A pay stub may show a state-mandated contribution even when the state does not withhold a broad wage income tax. Depending on the jurisdiction, deductions can support paid family and medical leave, temporary disability insurance, long-term care, or an unemployment insurance program. Names, wage limits, rates, exemptions, and employer-employee cost sharing vary and can change annually.

For example, Alaska’s official 2026 unemployment insurance page lists an employee contribution rate. Other states structure unemployment financing differently, often as an employer tax. The IRS has also issued federal tax guidance for mandatory state paid family and medical leave contributions and benefits. These examples show why “state tax” is too broad a label to identify a deduction safely.

Employee deduction or employer tax?

An employer’s payroll cost is not automatically an employee deduction. State unemployment taxes and workforce assessments are often paid from employer funds. A pay stub may display employer-paid amounts for information, but informational display should not reduce net pay. Compare the gross-to-net calculation rather than assuming every visible line was subtracted.

The figures are hypothetical and do not represent any state’s rate. A real paycheck may use different taxable wage bases for each line.

Why the state on your paycheck may be wrong

Employees who move, work remotely, travel between worksites, or live and work in different states can have more complicated withholding. Some state pairs have reciprocal arrangements; others allow a resident credit for tax paid elsewhere; some impose special sourcing rules. Payroll may need updated residence and work-location records before it can apply the correct setup.

Review Form W-2 boxes 15 through 17 for the state, state employer identification number, state wages, and state income tax. Other state contributions may appear elsewhere, including box 14, depending on reporting instructions. If the state or wage amount looks wrong, ask payroll which residence, work location, and state certificate it used, then verify the answer with the relevant state tax or labor agency.

Where this comes from

• IRS: State Government Websites (opens in a new tab)
• IRS Publication 15 (2026), Employer’s Tax Guide (opens in a new tab)
• IRS Revenue Ruling 2025-4, State Paid Leave Programs (opens in a new tab)
• Alaska Department of Labor: 2026 Unemployment Insurance Tax Rates (opens in a new tab)
• IRS: Instructions for Forms W-2 and W-3 (opens in a new tab)