How to Use the Income Tax Calculator
- Choose the tax year and your filing status.
- Enter your gross income and any pre-tax deductions such as 401(k) or HSA contributions.
- Enter itemized deductions if they exceed the standard deduction, or leave 0.
- Enter any tax credits.
- Press Calculate and open the bracket table.
Formula
Taxable income = gross income − pre-tax deductions − max(standard deduction, itemized deductions) Tax = Σ (income in each bracket × bracket rate) Tax after credits = max(0, tax − credits) Effective rate = tax ÷ gross income
Example Calculation
A single filer in tax year 2026 earning $85,000 with no other adjustments subtracts a $16,100 standard deduction, leaving $68,900 taxable. The first $12,400 is taxed at 10%, income up to $50,400 at 12% and the rest at 22%, for about $9,870 in federal tax. The effective rate is about 11.6% and the marginal rate 22%.
What Is an Income Tax Calculator?
It estimates how much federal income tax you owe on a given income and shows how your tax is built up across brackets. It is useful for planning, for checking a withholding setup and for seeing what an extra pre-tax contribution could save.
How Tax Brackets Work
A bracket is a range of taxable income taxed at a given rate. When your income crosses into a higher bracket, only the dollars above the threshold are taxed at the higher rate. A raise cannot reduce your take-home pay because of brackets alone.
Deductions and Credits
Deductions reduce taxable income. Most filers take the standard deduction; itemizing helps only if your deductible expenses exceed it. Credits reduce the tax itself, dollar for dollar, so they are generally more valuable than deductions of the same size.
Ways to Reduce Taxable Income
- Contribute to a pre-tax 401(k), HSA or deductible IRA; see the 401(k) calculator.
- Claim credits for which you qualify.
- Bunch itemizable expenses into alternating years if close to the standard deduction.
Common Mistakes
- Believing a raise can push you into a lower take-home pay.
- Confusing marginal rate with total tax rate.
- Using outdated brackets.
Estimates only. Brackets, deductions and credits change; consult IRS publications or a tax professional. To estimate your paycheck, use the take-home pay calculator, and read how to calculate your take-home pay.