Marginal Tax Bracket Calculator
Compute income tax across three progressive brackets you define, and see your marginal rate, effective rate, and after-tax income.
How to use this tool
- Enter your taxable income (after deductions).
- Set the top of bracket 1 and bracket 2, and the three rates.
- Read total tax, your marginal rate (top bracket), effective rate (average), and after-tax income.
See how progressive brackets actually work. Enter your taxable income and define up to three brackets; the calculator taxes each slice at its own rate and shows your total tax, marginal rate, and effective rate.
Formula
Progressive tax adds up the tax owed within each bracket:
Tax = (income in bracket 1 × rate 1) + (income in bracket 2 × rate 2) + (income above bracket 2 × rate 3)
Marginal rate = the rate of the highest bracket your income reaches.
Effective rate = Total tax ÷ Income × 100%.
How it works
Progressive income-tax systems split income into bands (brackets) and tax each band at its own rate. Only the income that falls inside a bracket is taxed at that bracket's rate, which is why your marginal rate (the rate on your top band) is higher than your effective rate (your average across all income). This tool models three editable brackets so you can reproduce any real schedule's lower tiers or experiment with reform scenarios.
Real schedules have more than three brackets and vary by filing status, jurisdiction, and year, so the thresholds and rates here are inputs rather than hard-coded tables — enter your authority's figures to match an exact schedule. The calculator assumes income is already taxable income (after deductions) and does not apply credits, surtaxes, or alternative minimum taxes.
Reviewed by the AbraCalc Tax Desk. This is an educational estimate, not tax advice; for an exact liability consult your tax authority's full bracket table (for the United States, the IRS).
Worked example
$50,000 income across 10% / 20% / 30% brackets
- Bracket 1: first $10,000 × 10% = 1,000.
- Bracket 2: next $30,000 (from 10,000 to 40,000) × 20% = 6,000.
- Bracket 3: remaining $10,000 (above 40,000) × 30% = 3,000.
- Total tax = 1,000 + 6,000 + 3,000 = 10,000.
- Marginal rate = 30% (top bracket reached); effective rate = 10,000 ÷ 50,000 = 20%.
Total tax = $10,000.00, marginal rate = 30.00%, effective rate = 20.00%
Tax by income with 10% / 20% / 30% brackets ($0–10k, $10k–40k, $40k+)
| Taxable income | Total tax | Marginal rate | Effective rate |
|---|---|---|---|
| $5,000 | $500 | 10% | 10.00% |
| $10,000 | $1,000 | 10% | 10.00% |
| $20,000 | $3,000 | 20% | 15.00% |
| $40,000 | $7,000 | 20% | 17.50% |
| $50,000 | $10,000 | 30% | 20.00% |
| $75,000 | $17,500 | 30% | 23.33% |
| $100,000 | $25,000 | 30% | 25.00% |
Key terms
- Progressive tax
- A system where higher bands of income are taxed at higher rates, so each slice is taxed at its own bracket rate.
- Tax bracket
- A band of income with a single rate; income within the band is taxed at that rate.
- Marginal rate
- The rate applied to your next dollar — the rate of the highest bracket your income reaches.
- Effective rate
- Total tax divided by total income; always at or below the marginal rate in a progressive system.
Frequently asked questions
- Does moving into a higher bracket tax all my income at that rate?
- No. Only the income inside the higher bracket is taxed at the higher rate. Earlier income keeps its lower bracket rates, which is why a raise never reduces your take-home pay.
- Why is my effective rate lower than my marginal rate?
- Because progressive systems tax your first dollars at low rates and only your last dollars at the top rate. The effective rate is the weighted average across all brackets, so it sits below the marginal rate.
- Real tax tables have more than three brackets — can I still use this?
- Yes for the lower portion of a schedule or for what-if analysis. For an exact liability with many brackets, enter your authority's full table elsewhere; this tool illustrates the mechanism with three editable tiers.