Federal Withholding Calculator
Your W-4 determines how much tax is taken from each paycheck. This estimator shows your expected annual federal tax and whether your current withholding will end in a refund or a bill.
How to use this calculator
- Enter annual gross income.
- Enter other income (interest, side income).
- Enter filing status.
- Enter tax credits per year (e.g. child tax credit).
- Enter tax already withheld this year.
- Your results appear instantly below and update as you change the numbers.
How this calculator works
The calculator subtracts the 2026 standard deduction ($16,100 single / $32,200 married) from your income, applies the 2026 federal brackets, subtracts your credits, and compares the result to what has already been withheld from your paychecks. A positive difference means a refund; a negative difference means you will owe. If you owe, increase your W-4 withholding or make an estimated payment; if you get a large refund, reduce withholding to keep more of your money during the year.
Frequently asked questions
How do I change my withholding?
Submit a new W-4 form to your employer — it is the only way to adjust paycheck withholding. For side income, make quarterly estimated tax payments instead. The IRS W-4 itself is a good guide for filling it out.
Is a big refund a good thing?
A refund means you overpaid during the year — the IRS returned your own money without interest. Getting a refund is common and popular, but adjusting your W-4 to owe near zero puts the money in your paycheck instead.
What happens if I under-withhold?
If you owe more than $1,000 and your withholding covered less than 90% of the tax due (or 100% of last year's tax), you may owe an underpayment penalty on top of the balance.
Disclaimer: Results are estimates for general information only and do not constitute financial, tax, or legal advice. Figures reflect 2026 rules and may change. Always confirm current limits and consult a qualified professional before making decisions. Official figures: IRS.gov · 2026 limits per IRS tax inflation adjustments.