What Is a Marginal Tax Rate?
Quick Answer
Your marginal tax rate is the tax rate applied to your last dollar of income. It represents the highest tax bracket your income reaches. For example, a single filer with $70,000 in taxable income has a marginal rate of 22%. But that does not mean all $70,000 is taxed at 22% — only the portion above $48,475 is. Your actual overall tax burden is measured by your effective tax rate.
How Marginal Tax Rate Works
The U.S. uses a progressive tax system where income is taxed in layers. Each layer (bracket) has its own rate. Your marginal rate is simply the rate on the top layer.
The 2025 federal marginal rates for single filers are:
- 10% on income up to $11,925
- 12% on income from $11,926 to $48,475
- 22% on income from $48,476 to $103,350
- 24% on income from $103,351 to $197,300
- 32%, 35%, and 37% on higher amounts
Your marginal rate is the rate that applies to the next dollar you earn. This makes it especially useful for evaluating financial decisions at the margin.
Why Your Marginal Rate Matters
Knowing your marginal rate helps you make smarter decisions about:
- Retirement contributions: Every dollar you put into a traditional 401(k) saves you taxes at your marginal rate. If you are in the 22% bracket, a $1,000 401(k) contribution saves you $220 in federal tax.
- Deductions: Pre-tax deductions and the standard deduction reduce income taxed at your highest rate first.
- Side income: If you pick up a side hustle, that income starts at your current marginal rate, not at 10%.
Real Example With Actual Numbers
David is single, earns $95,000 in New York, and takes the standard deduction of $15,000. His taxable income is $80,000.
Here is how his federal tax is calculated:
| Bracket | Income | Tax |
|---|---|---|
| 10% | $11,925 | $1,192.50 |
| 12% | $36,550 | $4,386.00 |
| 22% | $31,525 ($80,000 - $48,475) | $6,935.50 |
| Total | $80,000 | $12,514.00 |
David's marginal rate is 22%. His effective rate is 15.6% ($12,514 / $80,000).
Now suppose David gets a $10,000 raise to $105,000. His taxable income becomes $90,000. The additional $10,000 is still in the 22% bracket (which goes up to $103,350), so he pays $2,200 more in federal tax and keeps $7,800 of the raise before state taxes. He is always better off. Run your own scenario with the SalaryHog calculator.
Marginal Rate vs Effective Rate
| Marginal Rate | Effective Rate | |
|---|---|---|
| What it measures | Tax on your last dollar | Average tax on all dollars |
| David's example | 22% | 15.6% |
| Best used for | Evaluating deductions, extra income | Understanding total tax burden |
Both numbers are important. Your marginal rate guides financial decisions; your effective rate tells you the big picture. The SalaryHog calculator shows both.
How to Lower Your Marginal Rate
You cannot change the bracket thresholds, but you can reduce the income that reaches higher brackets:
- Maximize 401(k) contributions ($23,500 limit in 2025)
- Contribute to an HSA ($4,300 individual / $8,550 family in 2025)
- If married, filing jointly often lowers your marginal rate by doubling the bracket thresholds
Try the calculator to see how these adjustments change your take-home pay.