Tax Withholding Calculator
Estimate how much federal income tax should be withheld from each paycheck based on your income, filing status, and W-4 allowances. Use it when starting a new job or adjusting your W-4 to avoid a surprise tax bill.
About this calculator
Federal income tax withholding is calculated by first finding your taxable income: taxableIncome = annualIncome − standardDeduction − (allowances × $4,300), where the standard deduction is $12,950 for single filers, $25,900 for married filing jointly, and $19,400 for head of household. A marginal tax rate is then applied (12% for taxable income up to roughly $40,525; 22% above that in this simplified model) to arrive at estimated annual tax. Per-period withholding = (taxableIncome × rate) / payPeriods + additionalWithholding. Note that this is a simplified single-bracket approximation; actual IRS withholding tables use graduated brackets. The formula helps you quickly gauge whether your current withholding is on track or whether you should adjust your W-4.
How to use
Suppose you earn $60,000/year, file as single, claim 1 allowance, have no additional withholding, and are paid bi-weekly (26 pay periods). Taxable income = $60,000 − $12,950 − (1 × $4,300) = $42,750. Since $42,750 > $40,525, the rate is 22%. Estimated annual tax = $42,750 × 0.22 = $9,405. Per-paycheck withholding = $9,405 / 26 ≈ $361.73. If your pay stub shows significantly less, you may owe taxes at filing; if significantly more, you'll likely receive a refund.
Frequently asked questions
How do I know if I am having enough federal tax withheld from my paycheck?
The clearest sign of under-withholding is owing a large balance when you file your return — and potentially a penalty if you owe more than $1,000 and paid less than 90% of your current-year liability. You can compare your year-to-date withholding on your pay stub against your estimated annual tax liability using this calculator. The IRS also provides an official Tax Withholding Estimator tool at irs.gov for a more precise result using the full graduated brackets. If you're consistently getting large refunds, you're over-withholding — essentially giving the IRS an interest-free loan.
What is the difference between W-4 allowances and the standard deduction?
The standard deduction is a fixed dollar amount subtracted from your gross income to determine taxable income before any tax rate is applied — it's a feature of your tax return. W-4 allowances (used on older W-4 forms before 2020) were a separate withholding adjustment that reduced the amount withheld per paycheck. The 2020 redesigned W-4 replaced allowances with direct dollar entries for deductions and credits, making withholding more accurate. If you're using a pre-2020 W-4 or an employer system still referencing allowances, each allowance roughly reduces annual withholding by $4,300 worth of income.
When should I update my tax withholding by filing a new W-4?
You should file a new W-4 whenever a major life event changes your tax situation: getting married or divorced, having a child, taking on a second job, or receiving a large raise or bonus. If you owed a significant amount at last year's filing or received an unexpectedly large refund, those are also signals to rebalance. The IRS recommends reviewing your withholding every year, especially after major tax law changes. Submitting a new W-4 to your employer takes effect within one or two pay cycles.