Effective rate versus marginal rate
Two different numbers describe the tax on your income, and confusing them leads to bad decisions. The effective tax rate is your total tax divided by your total income — the average across everything you earned. The marginal tax rate is the rate on your next dollar of income, which is just the top bracket your income reaches. The effective rate tells you what you actually pay overall; the marginal rate tells you what the next dollar — or the last dollar — costs.
The effective tax rate
Effective tax rate = Total tax ÷ Total income
Marginal tax rate = Rate on your next dollar of income
In a progressive system, only the income that falls inside each bracket is taxed at that bracket’s rate. Because the lower brackets always apply to part of your income, your effective rate ends up below your marginal rate.
Worked example
Say you earned $100,000 last year and paid $18,000 in tax, with a top bracket of 24%. One division gives your real burden:
| Step | Amount |
|---|---|
| Gross income | $100,000 |
| Total tax paideverything owed for the year — federal, and any payroll or state tax you include | $18,000 |
| = Effective tax ratetotal tax ÷ gross income — 6 points below the 24% marginal bracket, leaving $82,000 after tax | 18% |
Computed with this calculator's default settings — open the tool above and you'll see the same numbers, then swap in your own income and tax bill.
The bracket myth, busted
The most stubborn misconception in personal finance is that “moving into a higher bracket” can leave you worse off. It cannot. Tax brackets are marginal, which means only the dollars above a threshold are taxed at the higher rate — everything below it keeps being taxed at the lower rates. A raise always increases your take-home pay; the new bracket touches only the income that crosses into it, never your whole salary. This is exactly why the effective rate is always lower than the marginal rate: most of your income is sitting in the cheaper brackets underneath.
Knowing the difference changes how you make decisions. Use themarginal rate for anything happening at the edge of your income: an extra $1,000 earned, or a $1,000 deduction, is valued at the marginal rate, because those dollars sit at the very top of the stack. Use the effective rate to gauge your overall burden and to compare year to year — it is the honest headline number for how heavily you are taxed.
Federal, or all-in?
A federal effective rate divides federal income tax by your income, but that is not the whole story. A true all-in effective rate also includes payroll taxes (FICA — Social Security and Medicare) and any state and local income taxes you owe, all of which stack on top of the federal bill. To build up the full picture, estimate your federal liability with ourincome tax calculator, add payroll tax using theFICA tax calculator, and — if you work for yourself — check theself-employment tax calculator, since the self-employed cover both halves of FICA.
Frequently asked questions
What is the effective tax rate?
Your effective tax rate is the total tax you pay divided by your total income — the actual share of your income that goes to tax. If you earned $80,000 and paid $12,000 in tax, your effective rate is 15%. It is a single, blended figure that captures your real burden across all the brackets your income passes through, rather than the rate that applies to any one slice of it.
What is the difference between marginal and effective tax rate?
The marginal rate is the rate charged on your next dollar of income — your top bracket. The effective rate is the average across everything you earned. In a progressive system only the income inside each bracket is taxed at that bracket rate, so the lower brackets pull your average down. That is why the effective rate is always lower than the marginal rate.
Does a raise ever lower my take-home pay?
No. Moving into a higher bracket never reduces what you keep, because only the dollars above the threshold are taxed at the higher rate. Everything you earned below it is still taxed at the lower rates. A raise always leaves you with more money after tax — the higher bracket applies only to the new income that crosses into it, not to your whole salary.
Which rate should I use for decisions?
Use the marginal rate for anything at the margin: an extra $1,000 of income, or a $1,000 deduction, is valued at your marginal rate, since those dollars sit at the top of your stack. Use the effective rate to understand your overall burden and to compare one year against another. Mixing the two — valuing a deduction at your effective rate — understates its worth.
Is the effective rate just federal tax?
It depends on what you include. A federal effective rate divides federal income tax by income. A true all-in effective rate also folds in payroll taxes such as Social Security and Medicare, plus any state and local income taxes you owe. The all-in figure is usually meaningfully higher, because payroll and state taxes apply on top of the federal bill.
Sources
The official figures this page quotes are drawn from the primary sources above — check them (or a qualified professional) before relying on a result.
Disclaimer: This calculator is foreducation and illustration only. Effective and marginal rates depend on your filing status, deductions, credits, and the specific brackets in force, and an all-in rate also turns on payroll and state taxes. The figures here are estimates, not tax advice. Confirm your situation with the relevant tax authority or a qualified professional.