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How to Check Your Tax Withholding for 2025 and 2026
Tax withholding is the amount your employer deducts from each paycheck and remits to the IRS on your behalf. If withholding is too low, you'll owe a tax bill — and potentially an underpayment penalty — in April. If it's too high, you've given the government an interest-free loan all year. The IRS estimates that roughly 1 in 5 Americans is meaningfully underwitheld at any given time.
The most common causes of under-withholding: a raise, a second job, freelance income, getting married, or losing a deductible expense like student loan interest that wasn't updated on your W-4. The most common cause of over-withholding: leaving the W-4 at zero on every blank out of caution.
How to Use the 2025–2026 Tax Withholding Calculator
Enter your full annual income and filing status. The calculator shows your estimated 2024 total tax liability. Compare that to your year-to-date federal withholding from your most recent pay stub (look for "Federal Income Tax Withheld"). Multiply your YTD withholding by (total pay periods / pay periods completed) to project your annual withholding. If that projected number falls short of the calculator's estimate, consider updating your W-4. If you have self-employment or side income, visit our self-employment tax calculator. For detailed bracket information, see our federal tax brackets guide. Run a full multi-state estimate on the main US income tax calculator.
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Tax Withholding FAQs — 2025 & 2026
How do I update my withholding if I owe too much at tax time?
Submit a new W-4 to your employer — you can do this at any time and it typically takes effect within one or two pay cycles. On Step 4(c) of the 2024 W-4, enter an additional dollar amount to withhold per paycheck. If this calculator shows you are on track to owe an extra $1,200 and you have 12 pay periods remaining, adding $100 per paycheck closes the gap exactly. The IRS also offers a free Tax Withholding Estimator at IRS.gov for more precise calculations, especially if you have multiple jobs or complex deductions.
What is the IRS underpayment penalty for 2024?
The IRS underpayment penalty for 2024 is calculated at the federal short-term interest rate plus 3 percentage points — currently around 8% annualized on the underpaid amount. The penalty applies if you owe more than $1,000 at filing and don’t meet a safe harbor. Safe harbors: (1) pay at least 90% of your current-year tax liability, or (2) pay at least 100% of last year’s tax (110% if last year’s AGI exceeded $150,000). Most employees who update their W-4 before October can avoid the penalty by covering the remaining shortfall in the last few paychecks.
Should I claim 0 or 1 on my W-4?
The 2020 W-4 redesign eliminated the old allowances system — there is no longer a "claiming 0 or 1" concept. The current W-4 uses dollar-based inputs. If you are single with one job and no dependents, leave Steps 2–4 blank and sign — the IRS will withhold based on your income as a single filer with the standard deduction. If you have two jobs or significant side income, complete Step 2 to avoid under-withholding. Our married filing jointly calculator can help couples determine the right W-4 adjustments when combining incomes.
How is withholding calculated on a bonus?
Bonuses are supplemental wages and the IRS permits two methods. The flat rate method: employers withhold 22% federal tax on the bonus regardless of your bracket — simple but can over- or under-withhold depending on your actual rate. The aggregate method: add the bonus to your regular wages for the period, calculate withholding on the total, and subtract what was already withheld from regular wages. If you expect a large bonus and your total income will push you into a higher bracket, you can submit a new W-4 before the bonus payment or make a manual estimated payment. See federal tax brackets to understand where a bonus might land.
Last updated: January 2024
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