How Do Tax Brackets Actually Work?

Most people think that getting a raise can push them into a higher tax bracket and they'll end up taking home less money. This is not how it works. Understanding how tax brackets actually function is one of the most useful things you can know about your paycheck.

The Marginal Rate System

The US uses a progressive tax system. This means different portions of your income are taxed at different rates — not your entire income at one flat rate.

Think of your income as filling up buckets. The first bucket is taxed at 10%. Once it's full, income spills into the second bucket, taxed at 12%. Then 22%, and so on. Only the income in each bucket is taxed at that bucket's rate.

The 2025 Federal Tax Brackets (Single Filers)

A Real Example

Say you earn $60,000 as a single filer. Here's how your federal income tax is calculated:

• First, subtract the standard deduction: $60,000 − $14,600 = $45,400 taxable income
• 10% on the first $11,925 = $1,192.50
• 12% on $11,926–$45,400 = 12% × $33,475 = $4,017
• Total federal tax: ~$5,210

Your effective tax rate is about 8.7% — not 12%, even though you're "in the 12% bracket."

What "Crossing a Bracket" Actually Means

If your raise pushes $5,000 of income from the 22% bracket into the 24% bracket, only those $5,000 are taxed at 24%. The rest of your income doesn't change at all. You'd owe an extra $100 on that portion — but you also earned $5,000 more. You always come out ahead.

Marginal Rate vs. Effective Rate

Two terms you'll hear often:

• Marginal rate: The tax rate on your next dollar earned. This is your "bracket."
• Effective rate: Your total tax bill divided by your total income. This is always lower than your marginal rate and is the more meaningful number for budgeting.