At a glance
Quick answer
Effective tax rate turns a named federal tax numerator into a percentage of total entered income. The federal income tax rate uses modeled income tax after the standard deduction. The included federal burden rate adds employee Social Security, regular Medicare, and Additional Medicare Tax. Both rates use wages, valid joint spouse wages, and other ordinary income as the same denominator. Adjusted gross income, taxable income, and income after the included burden are shown for context, not used as alternative denominators. The result does not measure every tax paid by a household. Property, sales, excise, state, local, and employer payroll taxes are absent, so the result must not be labeled a total tax rate.
How the calculation works
Choose the numerator before interpreting the percentage
Federal income tax effective rate divides modeled federal income tax by total entered income. The included federal burden rate divides federal income tax plus employee Social Security, regular Medicare, and Additional Medicare Tax by that same amount. Two percentages can therefore be correct for the same wages. A zero federal income tax rate does not imply zero included burden when payroll tax still applies. If total entered income is zero, the percentage is not defined and the calculator reports not applicable.
Keep the denominator stable across comparisons
Total entered income equals entered W-2 wages plus spouse W-2 wages only on a married filing jointly return plus other ordinary income. Other ordinary income enters federal income tax but is not treated as wages for payroll tax. Adjusted gross income, ordinary taxable income after the standard deduction, and income after the included federal burden appear as dollar context. None replaces total entered income in a displayed rate. The marginal rate answers what happens to the next ordinary taxable dollar and neither effective percentage predicts withholding.
Recognize rates that are still outside the result
The included burden omits employer payroll tax, state and local tax, sales tax, property tax, benefit deductions, withholding, and credits because this route has no credit inputs. It also omits Net Investment Income Tax because this route has no investment income inputs. At high wages, Additional Medicare Tax can enter the numerator, but a complete Alternative Minimum Tax calculation does not. Use the percentage as a consistent federal planning ratio, then disclose the numerator and denominator whenever sharing it.
Use percentages to compare, not to recreate the tax return
A percentage can summarize two scenarios only when both use the same components. If one result includes payroll tax and the other includes income tax alone, their difference says nothing useful about tax efficiency. Keep dollar tax beside the rate so a small denominator does not exaggerate a minor amount. When evaluating a deduction, compare before-and-after dollar liability as well as the effective rate. When evaluating another wage dollar, use the marginal rate instead. This discipline prevents a single attractive percentage from hiding which tax moved and whether the underlying income measure changed.
2025 and 2026 values
Tax year 2025
2025 final rate components
The final calculation uses the 2025 Tax Table below $100,000 of ordinary taxable income and the Tax Computation Worksheet from $100,000. Standard deductions are $15,750 for single and married filing separately, $31,500 for married filing jointly and qualifying surviving spouse, and $23,625 for head of household. Employee Social Security is 6.2% up to $176,100 and regular Medicare is 1.45% without a wage cap.
Tax year 2026
2026 planning rate components
The planning calculation uses Revenue Procedure 2025-32 ordinary brackets. Standard deductions are $16,100 for single and married filing separately, $32,200 for married filing jointly and qualifying surviving spouse, and $24,150 for head of household. Employee Social Security is 6.2% up to $184,500 and regular Medicare remains 1.45%. For both years, Additional Medicare Tax is 0.9% above $250,000 for married filing jointly, $125,000 for married filing separately, and $200,000 for the other supported statuses.
Recalculate it yourself
Worked example
Payroll tax creates a 7.65% burden at $10,000
A single filer enters $10,000 of wages, no spouse wages, and no other income for 2025.
- Taxable income = max($10,000 − $15,750 standard deduction, $0) = $0, so federal income tax = $0.
- Social Security = $10,000 × 6.2% = $620.
- Regular Medicare = $10,000 × 1.45% = $145.
- Included federal burden rate = ($0 + $620 + $145) ÷ $10,000 = $765 ÷ $10,000 = 7.65%.
Result
Federal income-tax effective rate is 0%, while the total included federal burden rate is 7.65%. The difference comes entirely from employee payroll tax.
What is included
- Federal income tax after the selected year and filing status standard deduction, employee Social Security and regular Medicare on entered W-2 wages, Additional Medicare Tax when applicable, and total entered income as the common denominator.
- Valid joint spouse wages, other ordinary income, adjusted gross income, ordinary taxable income, income after the included federal burden, the next dollar marginal rate, and the official or planning calculation method.
What is not included
- Itemized deductions, adjustments to income, federal tax credits, investment income, Net Investment Income Tax, Alternative Minimum Tax completion, employer payroll tax, state and local tax, property tax, sales tax, and benefit deductions.
- Withholding, estimated payments, refund or amount owed reconciliation, and any claim that the displayed ratio is the household's total tax burden.
Common mistakes
Comparing percentages with different denominators
A rate over gross income cannot be compared directly with one over taxable income. Confirm the denominator label before drawing a conclusion.
Calling the marginal bracket an effective rate
The marginal bracket applies to the next affected ordinary dollar. The effective rate divides a total tax numerator by total income.
Describing the included burden as all taxes
The ratio is federal and limited to named components. State, local, consumption, property, and employer taxes remain outside it.
Frequently asked questions
What does the Effective tax rate calculator measure?
The federal income tax rate divides modeled federal income tax after the standard deduction by total entered income. The included federal burden rate adds employee Social Security, regular Medicare, and Additional Medicare Tax to that numerator and uses the same denominator.
How is an effective rate different from a marginal rate?
An effective rate averages modeled tax across the chosen income denominator. A marginal rate describes the tax on the next dollar within the applicable rules.
Does the effective rate represent my total tax burden?
No. The result includes only the named federal income and employee payroll tax components. State and local tax, employer payroll tax, Net Investment Income Tax, benefits, withholding, sales tax, property tax, and other charges are outside its scope.
Does other ordinary income receive payroll tax in this calculator?
No. Other ordinary income enters the total income denominator and the modeled federal income tax calculation, but only entered W-2 wages and valid joint spouse W-2 wages enter employee Social Security and Medicare.
Primary sources
- 2025 Instructions for Form 1040, opens in a new tab
Reviewed 2026-07-25
- IRS Revenue Procedure 2024-40, opens in a new tab
Reviewed 2026-07-25
- IRS Revenue Procedure 2025-32, opens in a new tab
Reviewed 2026-07-25
- IRS Publication 15 (Circular E), Employer's Tax Guide for 2025, opens in a new tab
Reviewed 2026-07-25
- IRS Publication 15 (Circular E), Employer's Tax Guide for 2026, opens in a new tab
Reviewed 2026-07-25
- IRS Topic 751, Social Security and Medicare withholding rates, opens in a new tab
Reviewed 2026-07-25
- IRS Questions and answers for the Additional Medicare Tax, opens in a new tab
Reviewed 2026-07-25