Marginal versus effective rate
The US income tax is progressive, which means income is taxed in layers. Each bracket has its own rate, and that rate applies only to the dollars that fall inside the bracket — not to your whole income. The rate on your last, highest dollar is your marginal rate.
Your effective rate is something different and almost always lower: it is your total tax divided by your total income, blending all the bracket rates together. Confusing the two is the single most common tax misunderstanding, and it is why a raise can never leave you with less take-home pay.
How the per-bracket breakdown reads
The table walks through every bracket and shows how much of your income landed in it and how much tax that slice produced. The bar chart plots the tax paid in each bracket, so you can see where the bulk of your bill actually comes from — usually the middle brackets, where a wide band of income meets a moderate rate.
Using your bracket position
Knowing exactly where you sit in the brackets helps with planning:
- Pre-tax contributions to a 401(k) or traditional IRA reduce taxable income and are valued at your marginal rate.
- If you are near the top of a bracket, deferring income or accelerating deductions can keep more dollars in the lower band.
- Comparing your marginal and effective rates shows how much room a deduction really saves versus how the system taxes you overall.
Scope and caveats
This tool models the ordinary federal income tax using approximate 2024 brackets and assumes the figure you enter is already taxable income — that is, after the standard or itemised deduction. It excludes payroll taxes, the alternative minimum tax, capital-gains rates, credits, and state taxes. Use it to understand bracket mechanics, not as a substitute for a full return.
Formula
taxPaidInBracket = (min(income, top) − bottom) × rate; totalTax = Σ taxPaidInBracketFrequently asked questions
- Does moving into a higher bracket tax all my income more?
- No. Only the income above the bracket threshold is taxed at the higher rate. Income below it keeps its lower rates.