What Is Federal Income Tax Withholding?
Federal income tax withholding is the single biggest line item on most paychecks, and also one of the least understood. Here's what it actually is, how it's calculated, and why it can change even when your salary doesn't. What federal withholding actually is Federal income tax withholding is money your employer sends directly to the IRS on your behalf, throughout the year, as an advance payment toward your annual tax bill. It's not a separate tax — it's a prepayment of the same federal income tax you'll calculate when you file your return. At tax time, whatever was withheld is compared to what you actually owe: too much withheld means a refund, too little means you owe the difference. What determines how much is withheld Your employer calculates withholding based on: Your gross pay for that pay period Your filing status (single, married filing jointly, head of household) Your W-4 elections — including dependents claimed and any additional withhol...