How tax brackets actually work
The most common tax misconception in America: that a raise into a "higher bracket" can lower your take-home pay. It can't, ever, and here's why.
The mental model people have (and it's wrong)
The intuition many people carry: "If I'm in the 22% bracket and I get a raise that pushes me into the 24% bracket, I'll pay 24% on my whole income — so I'll bring home less."
This isn't how the US progressive tax system works. The 24% rate applies only to the dollars above the bracket threshold, not to all your income. A raise can never lower your take-home pay, because the higher rate is only charged on the extra dollars.
The correct mental model: stacked slabs
Think of your income as water filling a series of pools, each with a different "tax rate" stamped on it. The first $X of income falls into the first pool and gets taxed at the lowest rate. The next $Y falls into the second pool at a higher rate. And so on. Each dollar only gets taxed at the rate of the pool it lands in.
For 2025, single-filer federal brackets are:
| Bracket | Rate |
|---|---|
| $0 – $11,925 | 10% |
| $11,925 – $48,475 | 12% |
| $48,475 – $103,350 | 22% |
| $103,350 – $197,300 | 24% |
| $197,300 – $250,525 | 32% |
| $250,525 – $626,350 | 35% |
| $626,350+ | 37% |
This is taxable income — after the standard deduction ($15,000 for single filers in 2025) and any other adjustments.
A worked example
Take a single filer with $80,000 of taxable income. The tax calculation:
- First $11,925 × 10% = $1,192.50
- Next $36,550 (up to $48,475) × 12% = $4,386.00
- Next $31,525 (up to $80,000) × 22% = $6,935.50
- Total federal income tax: $12,514.00
Their marginal tax rate is 22% — that's the rate on the last dollar they earned. Their effective tax rate is $12,514 ÷ $80,000 = 15.6% — that's the average rate across all their income.
The key distinction: "I'm in the 22% bracket" describes the marginal rate. The effective rate — what you actually pay as a percentage of total income — is always lower in a progressive system, because the lower brackets keep their lower rates.
What happens when you get a raise
Suppose our $80k earner gets a $10k raise to $90k. The new tax:
- Nothing in the 10%, 12%, and 22% brackets changes (those dollars are taxed the same).
- The extra $10,000 sits in the 22% bracket (since $90k is still below $103,350).
- Extra tax: $10,000 × 22% = $2,200.
- Extra take-home: $10,000 − $2,200 = $7,800.
The raise is never a loss. If the same raise pushed someone from $100k to $110k, they'd cross into the 24% bracket — but only the dollars between $103,350 and $110,000 would be taxed at 24%. They'd still take home more.
When taxes do something weird: phase-outs
People sometimes lose money on a raise — but it's never because of the bracket structure. It's because of phase-outs: tax credits and benefits that disappear or shrink at higher income levels. Examples:
- Saver's Credit. Worth up to $1,000 for low-income retirement contributors, but cuts off sharply at certain income thresholds.
- Premium Tax Credit (ACA subsidies). Significant cliffs near 400% of Federal Poverty Level, where an extra $1 of income could cost thousands in subsidies.
- Student Loan Interest deduction. Phases out between $80k-$95k for singles.
- State-level benefits (SNAP, Medicaid, childcare subsidies) with hard income cliffs.
These are real and worth knowing if you're near a threshold — but they're not what people mean when they say "the 22% bracket vs the 24% bracket." Bracket changes themselves are always a win.
Run your numbers
The income tax calculator shows your bracket-by-bracket federal tax plus FICA, marginal rate, and take-home for any salary.
The other taxes you also pay
Federal income tax is one of three or four taxes on your paycheck:
- Federal income tax (the brackets above)
- FICA — Social Security (6.2% up to a cap) + Medicare (1.45% on everything, +0.9% on high incomes). Total: 7.65% for most workers.
- State income tax — varies wildly. 0% in 9 states (TX, FL, WA, NV, AK, SD, TN, NH, WY); 13.3% top rate in CA.
- Local income tax in some cities (NYC, Philadelphia, parts of OH).
Add them up and the combined marginal rate on the last dollar can easily hit 40%+ in high-tax states — but again, never on all your dollars, only on the ones above each respective threshold.
How to think about marginal vs effective for decisions
The right rate to use depends on the question you're asking:
- "Should I take this side gig?" → Marginal rate. Every extra dollar is taxed at the marginal rate.
- "Should I contribute to a Traditional 401(k)?" → Marginal rate. The contribution reduces your top dollars.
- "How much will I pay in taxes this year?" → Effective rate × income, or the actual stack-up math.
- "Is my Roth vs Traditional 401(k) choice right?" → Compare your current marginal rate to expected retirement marginal rate.
The TL;DR
Brackets apply to slices of income, not the whole thing. Raises are always net-positive. "Effective tax rate" (your total tax ÷ total income) is always less than your top bracket rate. The only way a raise can actually reduce take-home is via a benefit phase-out — and even then, that's not what tax brackets are doing.