Federal Income Tax — Payroll Definition

What is Federal Income Tax Withholding (FIT)?

Federal income tax withholding is a prepayment applied through payroll. The amount can depend on taxable wages, payroll frequency, Form W-4 entries, and the current IRS withholding method. It is not calculated by multiplying gross pay by one tax-bracket rate, and the amount withheld is not necessarily the employee’s final annual tax liability.

How to apply this payroll definition

Locate the label beside its current-period amount, taxable-wage basis, and year-to-date total. Compare it with prior genuine statements, benefits materials, the employer's payroll documentation, and the primary source linked on this page. The same abbreviation can carry a different employer-specific meaning.

What the label does not prove

A familiar term or plausible amount does not authenticate a pay statement or confirm identity, employment, wages, deductions, tax compliance, or eligibility. Ask the verified payroll contact about an unknown code. Use current agency instructions or a qualified adviser when a rate, filing, benefit, garnishment, or legal decision depends on the answer.

Browse all payroll definitions or use the pay-statement codes guide.