Effective vs Marginal vs Blended Tax Rate: The Difference That Costs You

Three numbers describe your income tax, and mixing them up is the single most common tax mistake people make. Someone turns down overtime because they think it will be "taxed at 32%," or assumes a raise barely moves the needle when it actually does. The fix is knowing which rate answers which question.

[!NOTE] Direct Answer Summary:

• Marginal rate: the rate on your next dollar of income — your top bracket.
• Effective rate: the weighted average across all your income — what you actually pay.
• Blended rate: the same thing as the effective rate. "Blended" and "effective" are two names for one number.

So there are really two distinct concepts — marginal and effective/blended — and understanding when each one matters is what protects your money.

Marginal Tax Rate: The Rate on Your Next Dollar

Your marginal rate is the bracket your last dollar lands in. If you are a single filer with $100,000 of taxable income in 2025, your marginal rate is 22% — but that rate applies only to the income above $47,150, not the whole $100,000.

Use your marginal rate to answer forward-looking questions:

• "If I take on $5,000 of overtime, how much tax will that money cost?"
• "How much will a $2,000 traditional 401(k) contribution save me?"
• "Is this side income worth it after tax?"

Because those decisions are about the next dollars, they are taxed at your marginal rate — never your average.

Effective (Blended) Tax Rate: What You Actually Pay

Your effective rate — identical to your blended tax rate — is your total tax divided by your total taxable income. For that same $100,000 filer, it works out to about 17%.

Effective / Blended Rate = Total Tax Liability / Total Taxable Income × 100

Use your effective rate to answer backward-looking questions:

• "What percentage of my income did I actually pay in tax?"
• "How does my real tax burden compare year over year?"
• "What is my true take-home percentage for budgeting?"

Side by Side

The $5,000 Overtime Example

Say you are offered $5,000 in overtime and you are in the 22% marginal bracket. People often reason with their effective rate ("I only pay 17%, great") or panic with a higher bracket they haven't even reached. Both are wrong.

The correct number is your marginal 22%: that $5,000 is taxed at 22%, so you keep about $3,900 (before FICA and state). Your effective rate barely moves — it inches up because the new money is a small share of your total. Use marginal to price the decision; watch effective to see the overall result.

Where Blended Rate Fits

"Blended tax rate" is just the everyday name for the effective rate — the weighted average of all your bracket rates. It is the exact same math as a blended interest rate on multiple loans: weight each rate by the amount it applies to, then average. If you want the step-by-step arithmetic, see how to calculate a blended tax rate, or run your numbers directly:

Frequently Asked Questions

What is the difference between marginal and effective tax rate?

Your marginal tax rate is the rate applied to your last dollar of income — your top bracket. Your effective tax rate is your total tax divided by your total taxable income, which averages every bracket together. The marginal rate is always equal to or higher than the effective rate.

Is the effective tax rate the same as the blended tax rate?

Yes. "Effective tax rate" and "blended tax rate" are two names for the same figure: the weighted average percentage of your income that you actually pay in tax. Tax software typically labels it "effective tax rate."

Which tax rate should I use for a raise or overtime?

Use your marginal rate. A raise or overtime pay is additional income stacked on top of what you already earn, so it is taxed at the rate of your highest bracket — not your lower average (effective) rate.

Why is my effective tax rate lower than my marginal rate?

Because progressive taxation applies lower rates to your lower tiers of income. Only the income in your top bracket is taxed at the marginal rate; everything below is taxed less. Averaging all those rates produces an effective rate below the marginal one.

Can my marginal and effective tax rates ever be equal?

Only if all of your taxable income falls within the lowest (10%) bracket. In that case every dollar is taxed at the same rate, so the marginal and effective rates match. Above that threshold, the effective rate is always lower.