The IRS recommends checking federal income tax withholding at least once a year. Its free online Tax Withholding Estimator helps employees determine whether their employers are taking the right amount from their pay.
Withhold too little, and a worker could face an additional tax bill and possibly penalties. Withhold too much, and take-home pay shrinks while more money goes toward a potential refund.
The agency’s withholding guidance highlights several situations that deserve attention, including working multiple jobs, working only part of the year, or receiving a large refund or tax bill after the previous filing season.
People with income that is not subject to withholding may also need an adjustment. Those who qualify for additional deductions or tax credits could need less withheld.
A marriage, divorce, new child, new job, or major income change can also affect the calculation, according to the IRS.
To get started, gather your latest pay stubs for every job. Include your spouse’s pay stubs if you expect to file jointly. Depending on your circumstances, you may also need your latest federal tax return and records of other income and deductible expenses.
The IRS Tax Withholding Estimator asks about income, adjustments, deductions, and credits. The agency estimates it takes about 25 minutes to complete.
It does not request your name, Social Security number, address, or bank account numbers. The IRS says it does not save or share your responses with the agency.
If the results suggest a change, the tool can generate a completed Form W-4 for your employer or payroll department.
The timing matters because withholding happens throughout the year. The IRS advises submitting updated information promptly when an adjustment is needed.
Workers who change withholding during the year may need another update in late December. The agency also recommends checking each January to keep the calculation aligned with the year ahead.
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