W-4 Step 3: Dependents and Tax Credits

How Step 3 works

Step 3 is an annual figure, not a per-paycheck one. Payroll spreads it across the pay periods that remain in the year, so a $2,200 entry made in January is felt in small slices over every remaining payday, while the same entry made in October is compressed into the last few.

The form supplies the arithmetic. Line 3(a) multiplies the number of qualifying children under age 17 by $2,200. Line 3(b) multiplies the number of other dependents by $500. You add the two figures, add an estimate of any other credits you expect, and enter the total on the Step 3 line. The printed multipliers apply if total income will be $200,000 or less, or $400,000 or less if married filing jointly.

Eligibility is set out on the form itself. For the child tax credit the child must be under age 17 as of December 31, must be your dependent who generally lives with you for more than half the year, and must have the required Social Security number. A dependent who fails that test — an older child, or a qualifying relative — can still support the credit for other dependents. Publication 501 carries the full eligibility requirements for both.

Step 3 is not restricted to dependents. The instructions permit an estimate of other credits you are eligible for, naming the foreign tax credit and the education tax credits, added to your dependent total and entered as one figure. Including them increases the paycheck and reduces the amount of any refund at filing.

Nothing entered here decides the credit itself. Step 3 changes only what payroll withholds; the credit is computed on the filed return under that year’s eligibility rules. If the estimate turns out high, the shortfall appears as a balance due, which is why a birth, a custody change, or a dependent aging out of a credit is a reason to file a fresh W-4 rather than wait for filing season.