Marginal Tax Rate Calculator (2026)

What Is a Marginal Tax Rate?

Your marginal tax rate is the rate applied to your next dollar of taxable income. It does not apply to your entire income. The U.S. federal tax system uses progressive brackets, meaning different portions of income are taxed at different rates.

Marginal vs Effective Tax Rate

Your marginal rate is your top bracket rate. Your effective tax rate is your average tax rate across all income. Most taxpayers misunderstand this difference.

• Marginal: The rate applied to your next dollar earned.
• Effective: Total tax ÷ total taxable income.

How This Calculator Works

This tool estimates your federal marginal tax rate using 2026 bracket thresholds.

1. Enter filing status.
2. Enter taxable income (after deductions).
3. The calculator identifies the bracket your top income falls into.

If you need help estimating taxable income first, use: Taxable Income Calculator.

Example: How Marginal Brackets Actually Apply

Suppose a single filer has $70,000 in taxable income. Only the portion above the previous bracket threshold is taxed at the higher marginal rate. Earlier income is taxed at lower bracket rates.

This means moving into a higher bracket does not cause all income to be taxed at that higher rate.

Bracket Stacking Explained

Federal income tax uses progressive stacking:

• Income fills lower brackets first.
• Once a bracket is full, the next dollar moves into the next bracket.

For the full bracket table, see: Federal Tax Brackets 2026.

Why Your Marginal Rate Matters

• Evaluating Roth vs Traditional retirement contributions
• Timing capital gains
• Deciding whether to take additional income this year
• Understanding bonus taxation impact

Marginal rate decisions often connect with: Tax Planning Strategies for 2026.

Common Mistakes

• Believing all income is taxed at the highest bracket.
• Confusing gross income with taxable income.
• Ignoring deductions when estimating marginal rate.

What This Tool Does Not Include

• State income taxes
• AMT adjustments
• Special surtaxes

Next Steps

• Understand your effective rate
• Estimate full federal tax
• Compare deductions vs credits