Marginal vs. Effective Rate
The single most misunderstood idea in personal finance: moving into a higher tax bracket does not mean all of your income gets taxed at that higher rate.
The U.S. uses a progressive tax system with brackets — each dollar you earn is taxed at the rate for the bracket it falls into, not your entire income at your top rate. Only the income within each bracket is taxed at that bracket's rate.
| Rate | Taxable income range |
|---|---|
| 10% | $0 – $12,400 |
| 12% | $12,400 – $50,400 |
| 22% | $50,400 – $105,700 |
| 24% | $105,700 – $201,775 |
| 32% | $201,775 – $256,225 |
| 35% | $256,225 – $640,600 |
| 37% | $640,600+ |
Tax year 2026, single filers, per IRS Revenue Procedure 2025-32. Brackets roughly double for married filing jointly and adjust for inflation every year — always confirm the current figures at irs.gov.
See Your Own Numbers
Enter your gross annual income to see your estimated federal tax, your effective rate (what you actually pay as a share of income), and your marginal rate (the rate on your next dollar earned).
Marginal vs. Effective Tax Estimator
Simplified: federal income tax only, single filer, standard deduction, no credits. Real returns vary — this is for understanding the mechanics, not for filing.
Standard Deduction & Taxable Income
Your tax bill isn't based on your full salary — it's based on taxable income, after deductions reduce the amount that gets taxed.
The standard deduction is a flat amount subtracted from your gross income before tax brackets apply. For 2026, it's $16,100 for single filers and $32,200 for married couples filing jointly. Most taxpayers take the standard deduction rather than itemizing, because itemized deductions (mortgage interest, large charitable gifts, certain medical expenses) rarely add up to more than the standard amount for the average filer.
Contributions to a traditional 401(k), traditional IRA, or an HSA reduce your taxable income today (you pay tax later, on withdrawal, for retirement accounts). See the Equity page for how these accounts work.
Common Tax Credits
Credits are more powerful than deductions — a deduction lowers the income you're taxed on, but a credit lowers your tax bill dollar-for-dollar.
Up to $2,200 per qualifying child under 17, subject to income phase-outs at higher earnings. Up to $1,700 of it can be refundable, meaning you can receive it even if it exceeds what you owe.
A credit for low-to-moderate income workers, larger with more qualifying children — up to roughly $8,200+ for families with three or more children. It's one of the most effective anti-poverty tools in the tax code, but it's also commonly missed by people who qualify and don't realize it. Free filing software (see Resources) will typically calculate this automatically.
The American Opportunity Credit (up to $2,500/year, first four years of college) and the Lifetime Learning Credit (up to $2,000/year, any level of education) can offset tuition costs — check phase-out income limits, which are not adjusted for inflation and stay fixed year to year.
W-4 & Withholding
Your paycheck already has taxes withheld — the W-4 form is how you tell your employer how much.
The W-4 doesn't set your tax rate — it tells your employer how much to withhold from each paycheck toward your eventual tax bill. Get it wrong and you'll either owe a surprise bill in April, or overpay all year and get it back as a refund.