Summary
CAUTION
Multiple jobs. Complete Steps 3 through 4(b) on only
one Form W-4. Withholding will be most accurate if
you do this on the Form W-4 for the highest paying job. Step 4 (optional).
Step 4(a). Enter in this step the total of your other
estimated income for the year, if any. You shouldn’t include
income from any jobs or self-employment. If you complete
Step 4(a), you likely won’t have to make estimated tax
payments for that income. If you prefer to pay estimated tax
rather than having tax on other income withheld from your
paycheck, see Form 1040-ES, Estimated Tax for Individuals.
Step 4(b). Enter in this step the amount from the Deductions
Worksheet, line 5, if you expect to claim deductions other than
the basic standard deduction on your 2021 tax return and
want to reduce your withholding to account for these
deductions. This includes both itemized deductions and other
deductions such as for student loan interest and IRAs.
Step 4(c). Enter in this step any additional tax you want
withheld from your pay each pay period, including any
amounts from the Multiple Jobs Worksheet, line 4. Entering an
amount here will reduce your paycheck and will either increase
your refund or reduce any amount of tax that you owe.