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How the US Progressive Tax System Works
The United States uses a progressive tax system, which means different portions of your income are taxed at different rates. Higher rates only apply to income above certain thresholds — not to all of your income at once.
This is the most commonly misunderstood part of American taxes. If a single filer earns $60,000 in taxable income in 2025, they do not pay 22% on all $60,000. They pay 10% on the first $11,925, 12% on the income between $11,925 and $48,475, and 22% only on the remaining $11,525.
How $60,000 of taxable income is actually taxed (single filer, 2025)
Marginal Tax Rate Explained
The marginal tax rate is the rate that applies to the next dollar of income you earn — the rate of your highest bracket. In the example above, the taxpayer's marginal rate is 22%, because the income at the top of their range fell into that bracket.
Your marginal rate is the right number to use when evaluating financial decisions that involve additional income. If you are considering freelance work, a part-time job, selling an investment, or doing a Roth conversion, your marginal rate tells you how much of that extra income goes to federal taxes.
Example: If you are in the 22% bracket and earn $5,000 from a side project, you will owe approximately $1,100 in additional federal income tax on that income (plus self-employment tax if applicable). Knowing this lets you accurately evaluate whether the work is worth it.
Effective Tax Rate Explained
Your effective tax rate is the percentage of your total gross income that actually goes to federal income tax. It blends all the rates you paid across each bracket into a single average number.
Effective rate calculation (same $60,000 example)
The marginal rate is 22% but the effective rate is only 13.5% — because most of the income was taxed at 10% and 12%. This is why saying "I'm in the 22% bracket" does not mean you pay 22% of your income in federal tax.
When to Use Each Rate
Understanding which rate applies to a given situation prevents costly mistakes in financial planning.
Use your marginal rate when: deciding whether additional income is worth pursuing, calculating the tax cost of a Roth IRA conversion, figuring out how much a bonus will net after taxes, or evaluating any choice that results in more taxable income.
Use your effective rate when: comparing your tax burden to prior years, benchmarking whether your tax planning strategies are working, summarizing your overall federal tax situation, or comparing your tax burden to that of other earners.
Common myth: People sometimes decline raises or extra income because "it will push me into a higher bracket." But only the income above the bracket threshold is taxed at the higher rate. Moving into a higher bracket always increases your after-tax income. You are never worse off earning more money under a progressive tax system.
Marginal and Effective Rates at Different Income Levels (2025, Single Filer)
To make this concrete, here is how marginal and effective rates differ across a range of common income levels for a single filer taking the standard deduction in 2025. Taxable income equals gross income minus the $15,000 standard deduction.
| Gross Income | Taxable Income | Marginal Rate | Est. Federal Tax | Effective Rate |
|---|---|---|---|---|
| $30,000 | $15,000 | 10% | ~$1,500 | 5.0% |
| $50,000 | $35,000 | 12% | ~$3,918 | 7.8% |
| $75,000 | $60,000 | 22% | ~$8,115 | 10.8% |
| $100,000 | $85,000 | 22% | ~$13,621 | 13.6% |
| $150,000 | $135,000 | 24% | ~$25,421 | 16.9% |
| $250,000 | $235,000 | 35% | ~$57,211 | 22.9% |
Key insight from this table: Notice that someone earning $250,000 has a 35% marginal rate but only a 22.9% effective rate. The gap between those two numbers is the result of the progressive system — every dollar below the $250,000 level is taxed at a lower rate. This is why your marginal bracket is not a useful summary of your overall tax burden.
Frequently Asked Questions
Disclaimer: This page provides general educational information about marginal and effective tax rates based on 2025 federal tax law. It is for educational purposes only and is not tax, legal, or financial advice. Individual tax situations vary. Consult a qualified tax professional for advice specific to your situation.