Most people look at their W-2 or their tax software summary and see a single percentage next to the words "federal withholding," then walk away believing that is the rate they pay. Almost always, that number is the marginal bracket — the tax rate on the last dollar you earned — not the rate on all of your dollars. The effective tax rate is the number that actually answers the question "what share of my income did I hand over to the government this year?"
This calculator divides your total tax paid by your gross income to produce that real, blended average rate, then places it next to your marginal bracket so you can see exactly how much of a gap progressive taxation creates between the two. Type in your numbers and every figure updates instantly.
How to Use
- Enter your Gross Income — the total you earned during the year before pre-tax deductions. If you prefer to use adjusted gross income (AGI) from your 1040 instead, that works too; just be consistent between the income and tax lines.
- Enter your Total Tax Owed — the bottom-line tax on your return after all credits, deductions, and withholdings. Pull this from line 24 of Form 1040 (or your state return if you want a combined federal-plus-state rate).
- Optionally add your Marginal Bracket — the top percentage your final dollar of income is taxed at. The tool uses this only to compute the gap between your marginal and effective rates.
- Pick your Pay Periods / Year — 12 for monthly, 24 for semi-monthly, 26 for biweekly, or 52 for weekly — so the per-paycheck tax figure matches how you are actually paid.
- Read the result card. The highlighted Effective Tax Rate is the percentage of your gross income that went to taxes. Below it, the calculator shows your after-tax income, the gap between marginal and effective, and the average tax withheld per paycheck.
The Effective Tax Rate Formula
The math is deliberately simple:
Effective Tax Rate = ( Total Tax Paid ÷ Gross Income ) × 100
For example, if you earned $100,000 and paid $15,000 in total tax, your effective rate is 15,000 ÷ 100,000 = 0.15, or 15%. Notice how far below your 22% marginal bracket that sits. That gap exists because the U.S. federal income tax is progressive: the first chunk of your income is taxed at 10%, the next chunk at 12%, the next at 22%, and only the portion above a threshold is taxed at your top bracket. Your effective rate is the weighted average of all those bracket rates, reduced further by deductions and credits.
If your gross income is $0 or negative, the tool refuses to divide by zero and shows an error — a real rate cannot be computed against no income. If your total tax is $0 (which can happen for lower earners who qualify for the standard deduction and credits), the effective rate is correctly 0%.
Effective vs. Marginal: Why the Gap Matters
The marginal rate answers a narrow question: "If I earn one more dollar, how much tax do I owe on that dollar?" The effective rate answers the broader question: "Of every dollar I actually earned, how much did I keep?"
A single filer with $100,000 of taxable income in 2024 lands in the 22% marginal bracket, yet their total tax is typically around $15,000–$18,000 — an effective rate of roughly 15%–18%. The 4–7 point gap is the reason you should never use your marginal bracket to estimate your take-home pay, and never use it to judge the value of a deduction. A $1,000 401(k) contribution does not save you $220 in tax at the margin in the way people naively assume; it saves 22 cents on the last dollar, but only for the portion of that contribution that falls inside the 22% bracket.
Conversely, when you run a side hustle or consider a raise, the marginal rate — not the effective rate — is the right number to use, because the extra dollars are taxed at the top bracket. Knowing both numbers keeps you from overestimating how much a raise will cost you in tax (use effective for lifetime planning) and from underestimating how much an extra hour of freelance work is taxed (use marginal).
Examples
Example 1 — The default profile. A single filer earns $100,000 in gross wages and owes $15,000 in federal income tax. Their effective tax rate is 15.0%, after-tax income is $85,000, and because their marginal bracket is 22%, the gap is 7.0 percentage points. On a biweekly pay schedule, the calculator shows roughly $576.92 of tax per paycheck.
Example 2 — The zero-tax household. A part-time worker earns $75,000 but, after the standard deduction, credits, and withholdings, owes $0 when they file. Their effective tax rate is 0.0%, after-tax income is the full $75,000, and the gap to their 12% marginal bracket is a full 12 points. This is a real outcome for earners who qualify for refundable credits, and it illustrates why the effective rate can sit far below the published bracket table.
Example 3 — The high earner. A married professional household earns $1,500,000 and pays $450,000 in combined federal and state tax. Their effective rate is 30.0%, after-tax income is $1,050,000, and even though their marginal bracket is 35%, the gap is only 5 points. At very high incomes, most dollars are taxed near the top bracket, so effective and marginal rates converge.
FAQ
What is the effective tax rate?
The effective tax rate is the percentage of your total gross income that you pay in taxes. It is calculated as total tax paid divided by gross income, multiplied by 100. Unlike your marginal bracket, which only applies to your last dollar earned, the effective rate is a blended average across every dollar you earned and every deduction, credit, and bracket that applies to you.
How is effective tax rate different from marginal tax rate?
Your marginal tax rate is the tax rate on the next dollar you earn — the top bracket you fall into. Your effective tax rate is the tax on all of your dollars combined. Because the U.S. tax system is progressive, your effective rate is always lower than your marginal bracket (or equal, if every dollar is taxed at the top rate). The gap is typically 4–8 percentage points for middle-class earners and shrinks toward zero for very high earners.
Does this calculator use federal, state, or payroll tax?
You decide. The calculator divides whatever total tax number you enter by whatever income number you enter. If you enter only your federal income tax from Form 1040, you get your federal effective rate. If you add state income tax and FICA, you get a combined effective rate. Just keep the numerator and denominator on the same basis — do not divide a federal-only tax by a gross-income figure that already excludes state tax.
Why is my effective tax rate lower than my bracket?
Because of the standard deduction, personal exemptions, and progressive bracket structure. The first roughly $14,600 of a single filer's income is taxed at 0% via the standard deduction, and the next chunks are taxed at 10% and 12% before you ever reach the 22% bracket. Averaging all of those lower rates with your top bracket pulls the overall percentage well below the top number on your bracket chart.
Is 15% a good effective tax rate?
For a single filer earning $100,000, an effective federal rate around 12%–18% is normal. For a household earning $250,000, a federal effective rate of roughly 15%–22% is typical. There is no single "good" number — the right benchmark is your own bracket table and your state's tax burden. What matters is understanding that your real take-home pay is gross income multiplied by (1 − your effective rate).
What counts as "total tax paid"?
Use the bottom-line tax on your return after non-refundable credits — for U.S. federal filers, that is line 24 of Form 1040. Do not include refundable credits as if they reduced tax below zero, and do not include payroll taxes (Social Security and Medicare) unless you specifically want a combined rate that treats FICA as part of your tax burden.
Disclaimer
This effective tax rate calculator is provided for informational purposes only and does not constitute tax, legal, or financial advice. Results are based entirely on the numbers you enter and the simple formula ETR = Total Tax ÷ Gross Income; they do not model 2024 or 2025 IRS brackets, deductions, credits, or state-specific rules. Actual effective rates vary by filing status, dependents, deductions, credits, and jurisdiction. Always confirm your tax position with a qualified CPA or enrolled agent before making financial decisions based on this result.