Guides · Marginal vs effective
Marginal vs effective tax rate
What they are
Marginal rate is the rate that applies to the next dollar you earn. It depends on which tax bracket your last dollar falls into. If you earn $80,000 in the US (single, 2026), your marginal federal income-tax rate is 22% — because the band that contains your 80,000th dollar starts at $50,400 and ends at $105,700.
Effective rate is the average across all of your gross income: total tax divided by total income. At the same $80,000 scenario, the effective federal income-tax rate is roughly 11.4% — not 22%. The difference is the contribution of the lower-taxed lower bands.
Why the distinction matters
- Promotion math. A raise that pushes you from 22% to 24% marginal does not mean 24% of the raise goes to tax. Only the slice that crosses the threshold is taxed at the new rate.
- Pre-tax vs Roth. Pre-tax contributions are typically worth it when your marginal rate exceeds the rate you expect at withdrawal. Effective rate alone is not enough.
- Reading the news. Headlines that say "people in the X% bracket pay Y% of all income tax" usually conflate marginal and effective. The marginal rate describes the bracket you're in; the effective rate describes what you actually pay.
- Calculator outputs. When a calculator says "you pay 22% tax", check whether it means your marginal rate (the rate on the next dollar) or your effective rate (the average so far). Both are useful — but mixing them up leads to wrong conclusions.
Worked example: US $80,000 (single, 2026)
Standard deduction: $16,100. Taxable income: $63,900. The band walk:
| Band | Slice | Rate | Tax |
|---|---|---|---|
| $0 – $12,400 | $12,400 | 10% | $1,240 |
| $12,400 – $50,400 | $38,000 | 12% | $4,560 |
| $50,400 – $63,900 | $13,500 | 22% | $2,970 |
| Total income tax | $8,770 | ||
Marginal federal income-tax rate: 22%.
Effective federal income-tax rate: $8,770 / $80,000 = 10.96%.
Plus ~7.65% in employee-side payroll taxes (capped at the
$184,500 Social Security wage base for 2026), which is itself
roughly proportional up to the cap — so the all-in effective
contribution rate stays low. The calculator shows all three numbers
explicitly.
Common misconceptions
- "If I get a $1,000 raise and I'm in the 22% bracket, I only take home $780." Wrong. The raise is taxed at your marginal rate, but only the slice above the threshold is. If the raise stays inside the 22% band, the marginal rate is 22%, so you take home $780 of the $1,000 — but if part of the raise crosses into the 24% band, only that part is taxed at 24%.
- "A 37% bracket means I lose 37% of my income." Wrong. The 37% applies only to income above $640,600.
- "Effective rate is the same for everyone earning the same." Mostly yes — at the federal level, for the same filing status and standard deduction. But state tax, pre-tax contributions, and credits all change it.
How the calculator shows this
The result panel shows both rates side-by-side, with the marginal rate also appearing as the rate on the highest band in the bracket walk table. If you want to confirm where the marginal rate comes from, open the "Income tax by bracket" details and look at the last line — the band that contains your top dollar.