Form W-4 is the IRS Employee's Withholding Certificate you give your employer so they withhold the right amount of federal income tax from each paycheck. The 2026 W-4 added a new exempt-from-withholding checkbox, updated standard deductions ($16,100 for single filers, $32,200 for married filing jointly), and a higher child tax credit of $2,200 per qualifying child under 17.

Update your W-4 whenever your financial situation changes significantly — marriage, divorce, a new child, a second job, or a large change in income. The IRS also recommends reviewing your withholding each January to account for updated tax brackets and standard deduction amounts.

Key 2026 W-4 changes: a dedicated exempt-from-withholding checkbox (replacing the old "write Exempt" method), higher standard deductions ($16,100 single / $32,200 MFJ), child tax credit increased to $2,200 per qualifying child under 17, and the Deductions Worksheet now includes qualified tips and overtime deductions from the One Big Beautiful Bill Act (OBBBA).

That depends on how much is withheld vs. your actual annual tax liability. If too little is withheld, you owe taxes at filing. If too much is withheld, you get a refund — but you effectively gave the government an interest-free loan. The goal of W-4 withholding is to get as close to zero as possible. Run your numbers in our income tax calculator for a full-year projection.

This calculator covers federal income tax withholding only, based on 2026 IRS Publication 15-T rules. State income tax rules vary by state. Nine states have no income tax at all: Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, and Wyoming. For state withholding, contact your state's department of revenue or use a state-specific withholding tool.

For 2026, the standard deduction is $16,100 for single filers and married filing separately, $32,200 for married filing jointly, and $24,150 for head of household filers. These increased from 2025 due to inflation adjustments. Taxpayers age 65 or older can claim an additional $2,050 (single) or $1,650 (MFJ).

The 2026 child tax credit is $2,200 per qualifying child under age 17, increased from $2,000 in prior years under the One Big Beautiful Bill Act. On the W-4, enter the total credit in Step 3. The income limit applies: $400,000 for MFJ and $200,000 for all other filers. To see how this impacts your paycheck, try our paycheck calculator.

Yes. If you had no federal income tax liability in 2025 and expect none in 2026, you can check the new exempt-from-withholding checkbox on the 2026 W-4. You must submit a new W-4 by February 16, 2027 to maintain this exemption. Filing exempt incorrectly can result in a large tax bill and penalties.