Marginal Tax Rate
Quick Definition
Your marginal tax rate is the federal income tax rate applied to your last dollar of taxable income. In the U.S. progressive tax system, income is taxed in slices, with each slice taxed at its own rate. Your marginal rate is the rate of the highest tax bracket your income reaches.
What It Means
When someone says "I am in the 22% bracket," they are describing their marginal tax rate. But being in the 22% bracket does not mean you pay 22% of your total income in taxes. It means only the income above the 22% bracket threshold is taxed at 22%. Everything below that threshold is taxed at 10% and 12%.
The marginal rate is the number that matters for financial decisions. Should you contribute to a traditional or Roth 401(k)? Should you harvest a capital gain this year? Should you do a Roth conversion? The answer depends on your marginal rate, because every additional dollar of income is taxed at that rate, and every dollar of deduction saves you taxes at that rate.
The One Big Beautiful Bill Act (OBBBA), signed into law on July 4, 2025, made the seven-bracket rate structure permanent. The TCJA-era rates (10/12/22/24/32/35/37%) were scheduled to sunset after 2025, which would have reverted the 24% bracket to 28% and eliminated the 10% bracket. That sunset was eliminated.
How It Works
2026 Federal Tax Brackets
The IRS released 2026 brackets in Revenue Procedure 2025-32. These apply to income earned in 2026 and reported on returns filed in early 2027.
Single Filers:
| Tax Rate | Taxable Income Range |
|---|---|
| 10% | $0 to $12,400 |
| 12% | $12,401 to $50,400 |
| 22% | $50,401 to $105,700 |
| 24% | $105,701 to $201,775 |
| 32% | $201,776 to $256,225 |
| 35% | $256,226 to $640,600 |
| 37% | $640,601 or more |
Married Filing Jointly:
| Tax Rate | Taxable Income Range |
|---|---|
| 10% | $0 to $24,800 |
| 12% | $24,801 to $100,800 |
| 22% | $100,801 to $211,400 |
| 24% | $211,401 to $403,550 |
| 32% | $403,551 to $512,450 |
| 35% | $512,451 to $768,700 |
| 37% | $768,701 or more |
Source: IRS Revenue Procedure 2025-32 and Tax Foundation analysis.
Finding Your Marginal Rate
Your marginal rate depends on your taxable income, not your gross income. Taxable income is calculated after subtracting deductions:
Gross Income minus above-the-line deductions (401(k) contributions, HSA, student loan interest) equals AGI. AGI minus the standard deduction ($16,100 single / $32,200 MFJ in 2026) or itemized deductions equals Taxable Income.
Find the bracket that your taxable income falls into. That bracket's rate is your marginal rate.
Example Calculation
A single filer with $90,000 gross income, $5,000 in 401(k) contributions, and the standard deduction:
- AGI: $90,000 minus $5,000 = $85,000
- Taxable income: $85,000 minus $16,100 = $68,900
- Marginal rate: 22% (taxable income falls in the $50,401 to $105,700 bracket)
This person's marginal rate is 22%. Every additional dollar they earn is taxed at 22%. Every dollar they deduct saves 22 cents.
Real-World Examples
Example 1: Valuing a Deduction
A single filer in the 24% marginal bracket contributes $5,000 to a traditional IRA.
- Tax savings: $5,000 x 24% = $1,200
- If they were in the 12% bracket instead: $5,000 x 12% = $600
The same $5,000 contribution saves twice as much at 24% as it does at 12%. This is why marginal rate matters for tax planning: it tells you exactly what a deduction or pre-tax contribution is worth.
Example 2: The Raise That Crosses a Bracket
A single filer earning $105,000 in taxable income (top of the 22% bracket) gets a $5,000 raise.
- First $700 of the raise (to $105,700): taxed at 22% = $154
- Remaining $4,300 (above $105,700): taxed at 24% = $1,032
- Total tax on the raise: $1,186
- Take-home from the raise: $5,000 minus $1,186 = $3,814
The raise still increases take-home pay. The higher bracket rate only applies to the dollars above the threshold, not to all income. This is the progressive system working as designed.
Example 3: Roth Conversion Planning
A retiree has $30,000 of taxable income from Social Security and pension payments. They are in the 12% bracket, which tops out at $50,400 for single filers in 2026. They have $20,000 of headroom before hitting the 22% bracket.
They convert $20,000 from a traditional IRA to a Roth IRA. The conversion is taxed at their current marginal rate of 12%, costing $2,400 in federal tax. If they waited and converted during a year when their income placed them in the 22% bracket, the same conversion would cost $4,400.
Knowing your marginal rate and your bracket headroom lets you time Roth conversions, capital gains harvesting, and other income events to minimize lifetime taxes.
Key Points to Remember
- Your marginal rate is the rate on your last dollar of taxable income, not the rate on all your income.
- It is the number that matters for decisions: deductions save at the marginal rate, additional income is taxed at the marginal rate.
- Brackets apply to taxable income (after deductions), not gross income.
- The OBBBA made the seven-bracket structure permanent in July 2025, eliminating the scheduled TCJA sunset.
- State income taxes add to your marginal rate. A California resident in the 37% federal bracket pays 37% plus up to 13.3% state, for a combined marginal rate of 50.3%.
- Marginal rate is always higher than effective rate. Effective rate is total tax divided by total income.
Common Mistakes to Avoid
- Believing a raise can reduce take-home pay: The higher bracket rate only applies to dollars above the threshold. A raise always increases net pay. Read our guide on how tax brackets work for the full explanation.
- Confusing marginal and effective rates: Saying "I am in the 24% bracket" does not mean you pay 24% of your income in taxes. Your effective rate is lower because your first dollars are taxed at 10% and 12%.
- Using the wrong year's brackets: The OBBBA changed the 2025 standard deduction mid-year, and 2026 brackets shifted with inflation adjustments. Always use current-year figures from the IRS.
- Ignoring state marginal rates: In high-tax states, the state marginal rate can add 10+ percentage points to your federal marginal rate. This affects Roth vs. traditional decisions significantly.
- Forgetting FICA: Federal income tax brackets do not include Social Security (6.2%) or Medicare (1.45%) taxes. Your total marginal rate on wages is higher than your income tax marginal rate alone.
Frequently Asked Questions
Q: What is the difference between marginal tax rate and effective tax rate? A: Marginal rate is the rate on your last dollar of income (your top bracket). Effective rate is your total tax divided by your total income (your average rate). Effective rate is always lower because your first dollars are taxed at lower rates. Use the marginal rate for planning decisions and the effective rate to understand your overall tax burden.
Q: How do I find my marginal tax rate? A: Calculate your taxable income (gross income minus above-the-line deductions minus standard or itemized deductions). Find the bracket that amount falls into on the current IRS table. That bracket's rate is your marginal rate. Use our tax bracket calculator to find yours.
Q: Did the OBBBA change the marginal tax rates for 2026? A: The seven rates (10/12/22/24/32/35/37%) remain the same and are now permanent. The income thresholds for each bracket increased by approximately 2.7% for inflation. The bottom two brackets (10% and 12%) received an additional 4% inflation adjustment under the OBBBA, slightly widening their income ranges.
Q: Why does my marginal rate matter for Roth vs. traditional decisions? A: If your current marginal rate is high, traditional 401(k) and IRA contributions save taxes at that high rate now. If you expect your marginal rate to be lower in retirement, you come out ahead. If your current marginal rate is low, Roth contributions lock in tax-free growth at a low cost. The decision hinges on comparing your current marginal rate to your expected future marginal rate.
Q: How do capital gains interact with my marginal rate? A: Long-term capital gains and qualified dividends use separate brackets (0%, 15%, 20%) that are tied to your taxable income level, not your ordinary income marginal rate. However, large capital gains can push your ordinary income into a higher bracket, which affects the taxation of other income. Use the take-home pay calculator to see your full tax picture.
