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Understanding Tax Brackets (Why a Raise Won't Shrink Your Paycheck)
5 min read · Updated August 2026
Quick answer: The U.S. uses a marginal tax system, meaning each tax bracket's rate only applies to the portion of income within that bracket, not your entire income. This is why a raise can never reduce your overall take-home pay, even if part of it falls into a higher bracket.
"I got a raise, so why did my paycheck barely change?" — I hear some version of this question constantly, and it almost always comes down to one misunderstanding: how tax brackets actually work.
The mix-up, cleared up
A lot of people assume that moving into a higher tax bracket means their entire income gets taxed at that higher rate. It doesn't work that way. The U.S. uses a marginal system — each bracket's rate applies only to the slice of income that falls inside it, not to everything you earn.
A quick, simplified example
| Income range | Rate on that slice |
|---|---|
| $0 – $20,000 | 10% |
| $20,000 – $50,000 | 15% |
| $50,000+ | 22% |
Someone earning $55,000 here does not pay 22% on the whole $55,000. They pay 10% on the first $20,000, 15% on the next $30,000, and 22% only on that last $5,000. A raise that nudges part of your income into a new bracket only raises the rate on that extra slice — your take-home pay never actually drops because of it. That part trips people up more than you'd think.
So why does the paycheck still feel smaller than expected?
A few things get unfairly blamed on "tax brackets" that are really separate line items:
- Payroll taxes (Social Security and Medicare) — a flat percentage, separate from income tax brackets entirely.
- Pre-tax deductions — health insurance premiums, 401(k) contributions — these shrink your paycheck, but they also shrink your taxable income, which is the point.
- State and local income tax, where it applies, stacked on top of federal tax.
Why this is worth actually understanding
Once marginal brackets click, a pretty common — and expensive — hesitation tends to disappear: turning down a raise, overtime, or a side project because of a vague fear it'll somehow shrink your net pay. It won't. Every additional dollar you earn still adds to your take-home pay, at worst just at a slightly lower after-tax rate for that last slice.
Tax bracket thresholds and rates change most years and are set by the IRS — this article deliberately avoids citing specific current numbers, which are best confirmed at irs.gov.
Quick Answers
Will a raise put me in a higher tax bracket and reduce my paycheck?
No. Moving into a higher tax bracket only raises the rate on the portion of income within that bracket, not your entire income, so a raise can never reduce your overall take-home pay.
How do marginal tax brackets work?
Each bracket's rate applies only to the slice of income that falls within it. Income is taxed at increasing rates as it crosses each threshold, rather than one flat rate applied to all of it.
Why does my paycheck feel smaller than my salary suggests?
Payroll taxes, pre-tax deductions like health insurance and 401(k) contributions, and state or local income tax are often mistaken for tax bracket effects, but they're separate line items.