Tax Withholding Calculator
Estimate how much federal income tax should be withheld each month under the current (2020 and later) Form W-4, using 2026 tax brackets and standard deductions, your filing status, dependent credits, extra deductions, and any extra withholding you request. Use it to check whether your paycheck withholding is in the right ballpark or whether you should update your W-4.
Last updated: September 2026
Formula below · 2 sources (IRS, Wikipedia) · Updated Sep 2026
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About this calculator
This calculator follows the logic of the IRS percentage method in Publication 15-T for the 2020-and-later Form W-4 (Step 2 checkbox not checked), using 2026 figures. It subtracts the 2026 standard deduction for your filing status ($16,100 single or married filing separately, $32,200 married filing jointly, $24,150 head of household) and any extra deductions you list in W-4 Step 4(b) from your annual gross wages, applies the 2026 progressive brackets (10%, 12%, 22%, 24%, 32%, 35%, 37%) to what is left, subtracts the dependent credits you claim in W-4 Step 3 ($2,200 for each child under 17 and $500 for each other dependent in 2026), and divides the annual result by 12. Any extra withholding you request per month is then added. The IRS tables build the standard deduction into the withholding brackets, so this gives the same annual figure as the percentage method before per-paycheck rounding. Allowances no longer exist on the W-4; they were removed in the 2020 redesign. Edge cases: if credits exceed the computed tax, withholding is $0 plus any extra amount; income below the standard deduction produces $0. Limits: it covers a single job, so for two jobs or a working spouse use the W-4 Step 2 worksheet or the IRS Tax Withholding Estimator; it ignores FICA, state tax, and supplemental-wage rules for bonuses. The goal of withholding is to roughly match what you actually owe so you avoid a large April bill (and possible underpayment penalties) or a giant refund (an interest-free loan to the government). Self-employed or large non-wage income usually needs quarterly estimated payments instead.
How to use
Example 1 — Single filer, no dependents. Gross annual wages $72,000, single, $0 dependent credits, $0 extra deductions, $0 extra withholding. Enter 72000, Single, 0, 0, 0. Result: about $584.17 per month. Verify: taxable = 72,000 − 16,100 = $55,900; 2026 tax = 10% × 12,400 + 12% × 38,000 + 22% × 5,500 = 1,240 + 4,560 + 1,210 = $7,010; 7,010 ÷ 12 = $584.17. ✓ That is about 9.7% of gross pay, before FICA and state tax. Example 2 — Married filing jointly with two children. Joint wages $145,000, married filing jointly, two children under 17 ($4,400 in Step 3), $5,000 of deductions in Step 4(b) for a traditional IRA contribution, no extra withholding. Enter 145000, Married Filing Jointly, 4400, 5000, 0. Result: about $728.33 per month. Verify: taxable = 145,000 − 32,200 − 5,000 = $107,800; tax = 10% × 24,800 + 12% × 76,000 + 22% × 7,000 = 2,480 + 9,120 + 1,540 = $13,140; minus $4,400 of credits = $8,740; ÷ 12 = $728.33. ✓
Frequently asked questions
How does federal income tax withholding actually work?
Your employer estimates your annual federal income tax liability based on your W-4 form (filing status, dependents, additional withholding requests) and divides it across your pay periods, withholding that amount from each paycheck and sending it to the IRS on your behalf. At year-end, you file your tax return; if total withholding was more than your actual tax liability, you get a refund; if less, you owe the difference. The W-4 redesigned in 2020 removed the old "allowances" system in favor of more direct inputs (filing status, dependents from the Child Tax Credit lookup, two-earner adjustments). This calculator uses the current W-4 logic with 2026 brackets for a single job. The IRS Tax Withholding Estimator at irs.gov/withholding is the official tool and also handles multiple jobs and other income.
What replaced allowances on the W-4?
Under the pre-2020 system, each allowance reduced the income subject to withholding by roughly $4,000 (the old personal exemption). The 2020 redesign removed allowances. Now you enter dependent credits in Step 3 ($2,200 per child under 17 and $500 per other dependent in 2026), other income in Step 4(a), and deductions beyond the standard deduction in Step 4(b). Deductions reduce taxable income; credits such as the Child Tax Credit reduce the tax itself dollar for dollar, which is why this calculator subtracts them after applying the brackets.
Should I aim for a refund or to break even?
Most personal-finance experts recommend aiming to break even or get a small refund — within a few hundred dollars in either direction. A large refund means you over-withheld and gave the government an interest-free loan all year; that money could have been earning 4–5% in a high-yield savings account or growing in your 401(k). A large bill at tax time can trigger underpayment penalties if you owed more than $1,000 and didn't meet the safe-harbor thresholds (paid at least 100% of prior-year tax or 90% of current-year tax). The IRS Tax Withholding Estimator can help you set your W-4 to land near zero refund/zero balance due. Update your W-4 whenever you have a major life change: marriage, divorce, new dependent, second job, retirement, or significant income change.
What are the most common mistakes people make with tax withholding?
The biggest is using outdated W-4 information after major life events — getting married, having a child, taking on a second job, or changing income significantly all materially change your tax liability, and forgetting to update the W-4 produces either large refunds or surprise tax bills. The second is over-withholding deliberately to "force savings" via the annual refund; that's an interest-free loan to the government rather than an effective savings strategy. The third is under-withholding from a second job because each employer only knows about that one job's income, missing the combined effect on your marginal tax rate. The fourth is forgetting that side-gig and freelance income require quarterly estimated payments — withholding from your day job won't cover non-W-2 income. The fifth is relying on a single-job estimate like this one when there are two jobs in the household; the IRS Tax Withholding Estimator handles that case. Finally, many people are surprised by the large gap between federal income tax withholding and the full bite that includes FICA (7.65%), state income tax (0–13%), and sometimes local tax — your total paycheck deductions are typically 20–35% of gross.
When should I not use this calculator?
Skip it if you or your spouse hold more than one job, or if you still have a pre-2020 W-4 with allowances on file; use the IRS Tax Withholding Estimator at irs.gov/withholding for those cases. It is the wrong tool for self-employed income, freelance gigs, or significant non-W-2 income; those require quarterly estimated payments rather than withholding, and you need a separate quarterly-tax calculator. Do not use it for state income tax — state systems vary enormously from flat-rate (Massachusetts, Illinois) to progressive (California, New York) to no-income-tax (Texas, Florida, Washington, Tennessee, Nevada, South Dakota, Wyoming, Alaska, New Hampshire). For complex situations (RSU vesting, large bonuses, equity compensation, supplemental wages, retirement-account conversions), the calculator's simplified model misses important rules and rates. And for any actual tax decision involving real money, consult a CPA or use professional tax software — this calculator is an estimate, not tax advice.