W-4 Withholding Calculator

How to read your W-4 withholding result

You get one of three answers. A projected refund means you are on pace to have more withheld than you owe, and the difference comes back after you file. A projected balance due means you are short and will write a check in April. "On track" means you are within $50 of break-even, which is the outcome worth aiming for.

A large refund is not a win. It is an interest-free loan to the government, repaid months later. Withholding close to break-even puts the same money in your paycheck every two weeks instead.

Two inputs cause most of the errors here. The first is the year-to-date federal income tax withheld. On a pay stub it is usually labeled "Federal Income Tax," "Fed W/H," or "FIT," and it is a separate line from Social Security, Medicare, and state tax. Use the YTD column, not the current-period column. The second is the number of paychecks you have already received this year. We prefill it from today's date, but if you started in August, or you switched jobs, type the real count.

A worked example. Biweekly gross of $2,400, single, no dependents, 16 paychecks in. Annualized gross is $62,400, minus the $16,100 standard deduction leaves $46,300 of taxable income, which produces $5,308 of federal income tax for the year. Break-even withholding is $204.15 per paycheck. If those 16 checks each withheld $210, you are on pace for $5,460 and land at a $152 refund, so Step 4(c) stays at $0. If they each withheld $180 instead, you are on pace for $4,680, short by $628 with 10 paychecks left, so $63 goes on Step 4(c).

What to actually write on Form W-4 (2026), line by line

Step 1 is your name, address, Social Security number, and filing status. The filing status box drives which standard deduction and bracket table your employer's payroll system uses, so it moves your withholding more than anything else you write down.

Step 2 only applies if you hold more than one job, or you are married filing jointly and your spouse works. Checking box 2(c) on both W-4s tells each employer to withhold as though the standard deduction and brackets are split between the jobs. This calculator does not model Step 2.

Step 3 is dependents and other credits. For 2026, multiply qualifying children under age 17 by $2,200 and other dependents by $500, then add the two. The child multiplier changed for 2026 from the long-standing $2,000, and plenty of guides and competing calculators still print the old figure. Step 3 only applies if your total income will be $200,000 or less, or $400,000 or less filing jointly. Above that, leave it blank.

Step 4(a) is other income without withholding, and Step 4(b) is deductions beyond the standard deduction. Neither is modeled here. Step 4(c) is extra withholding per pay period, and that is the number this tool produces. Step 5 is your signature: an unsigned W-4 is not valid, and payroll will reject it.

Why "claiming 0" doesn't exist anymore

The 2020 redesign removed allowances from the W-4 entirely. There is no line for 0, 1, or 2 anymore, so advice built around "claim 0 to be safe" no longer maps to anything on the form. In their place you enter dollar amounts directly.

The most common reason people still owe is that every employer withholds as if its job is your only income. Work two jobs at $30,000 each and both payroll systems apply the full standard deduction and start you at the 10% bracket, so together they withhold far less than a single $60,000 job would. A working spouse creates the same gap on a joint return.

Hourly workers hit a second version of this. A heavy overtime week withholds as though every week that year will be that big, and a light week does the reverse. Bonuses are withheld at the flat 22% supplemental rate, which is under-withholding for anyone in the 24% bracket or higher. Tips reported to your employer are wages, and if your cash tips outrun the withholding your paycheck can support, the shortfall shows up at filing.

The fix for all of these is the same: put a flat dollar amount on Step 4(c). It applies to every paycheck until you change it, and because withholding is treated as paid evenly across the year, raising it mid-year can still repair a shortfall that built up in January.

What this calculator can't see (and how to fix that)

The scope here is deliberately narrow: one job, steady pay, the standard deduction, federal income tax only. State income tax runs on a separate certificate in most states. FICA is fixed by statute and no W-4 entry touches it. Step 2 for multiple jobs, itemized deductions, and other income are all outside the model. For any of those, the IRS Tax Withholding Estimator at irs.gov/W4App handles the full picture in about 25 minutes.

The bigger problem for hourly workers, though, is the steady-pay assumption. Annualizing one paycheck is simply wrong if your hours move week to week or your overtime clusters in one season.

A real record beats an estimate here. ClockWage44 tracks shifts across every job you work and runs the whole paycheck calculation on your phone, taxes and overtime rules included. Feed the actual annual gross back into this calculator and the withholding check gets a lot sharper.