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Find the right federal tax withholding for your W-4. Avoid a surprise tax bill — or an unnecessarily large refund.
Freelance, investments, other jobs
401k, student loan interest, etc.
Child tax credit, education credits
Enter your income and click Calculate
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Federal income tax withholding is calculated by your employer using IRS Publication 15-T tables, based on the information you provide on your W-4. The 2020 redesign replaced allowances with direct dollar amounts. Your employer uses your filing status, standard deduction, additional income from other sources, and any extra withholding you request to compute tax withheld per pay period. The goal is to match your actual annual tax liability as closely as possible.
Withholding Accuracy Matters
Under-withheld
Tax bill in April
plus possible underpayment penalty
Over-withheld
Large refund
interest-free loan to IRS
Just right
Owe $0 or small refund
maximize cash flow all year
The most common cause of under-withholding is a two-income household where each spouse's employer withholds as if that salary is their only income — but the combined income pushes them into a higher bracket. The fix: check the "Multiple Jobs" box on Step 2 of the W-4, or use the IRS withholding estimator to calculate the exact additional amount to withhold per paycheck via Step 4(c).
The 2020+ W-4 uses a 5-step process: Step 1 (personal info + filing status), Step 2 (multiple jobs), Step 3 (dependents and tax credits), Step 4 (other adjustments), Step 5 (signature). Most people only need to complete Steps 1 and 5. This calculator helps you determine what to enter in Step 4 for additional withholding.
There is no one-size-fits-all answer. Withholding more gives you a refund in April but reduces your paycheck throughout the year (an interest-free loan to the government). Withholding less increases your take-home pay but risks owing taxes (and potentially a penalty) in April. The ideal is to break even — withhold exactly what you owe.
Common causes of under-withholding (owing money): multiple jobs in one household, significant investment income, freelance/gig income, large bonuses. Common causes of over-withholding (large refund): not claiming the child tax credit on your W-4, only one income in household, not updating W-4 after major life changes.
Update your W-4 after any major life change: marriage or divorce, birth or adoption of a child, significant salary change, second job, major investment gains, or any year you owed a large tax bill or received a large refund. Submit the new W-4 to your HR department — changes typically take effect within 1–2 pay periods.
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