Effective Tax Rate Calculator

Take a single filer earning $85,000 in 2025. After the $15,000 standard deduction, taxable income is $70,000. Applying the 2025 brackets: 10% on the first $11,925 ($1,192.50), 12% on the next $36,550 up to $48,475 ($4,386.00), and 22% on the remaining $21,525 up to $70,000 ($4,735.50). Total federal income tax is about $10,314. That is a marginal rate of 22% but an effective (average) rate of just 12.1% ($10,314 ÷ $85,000). This gap is the whole point of an effective tax rate calculator: your bracket is not what you actually pay.

The formula and 2025 brackets

The effective tax rate is simply:

Tax is computed progressively across the 2025 brackets for single filers (taxable income):

Married-filing-jointly and head-of-household filers use wider brackets; the calculator switches them automatically by filing status. All figures are for tax year 2025.

Effective vs marginal rate

Your marginal rate is the bracket your last dollar falls into - useful for decisions like "how much of this raise or bonus do I keep?" Your effective rate is the blended average across every bracket and is the better number for "what share of my income goes to tax?" In a progressive system the effective rate is always below the marginal rate.

Adding FICA for an all-in rate

Income tax is only part of payroll. Turn on FICA to add the employee share of Social Security (6.2% on wages up to the 2025 wage base of $176,100) and Medicare (1.45% on all wages, plus 0.9% additional Medicare on wages over $200,000 single / $250,000 married filing jointly). For our $85,000 single filer, that adds roughly $6,503 in FICA, pushing the all-in effective rate to about 19.8%.

Standard vs itemized deduction

The calculator defaults to the 2025 standard deduction ($15,000 single, $30,000 married filing jointly, $22,500 head of household). Switch to itemized if your mortgage interest, state and local taxes (capped), and charitable gifts together exceed the standard amount - a larger deduction lowers taxable income and therefore your effective rate.

How to use this calculator

You only need a few numbers to get a realistic estimate. Work through the inputs in order:

1. Gross income: enter your total wages or earnings for the year before any taxes or deductions are taken out.
2. Filing status: choose single, married filing jointly, or head of household. The calculator swaps in the correct bracket widths and standard deduction automatically.
3. Deduction: keep the standard deduction (the default for most filers) or switch to itemized and enter your total if it is larger.
4. FICA (optional): toggle this on to fold in Social Security and Medicare for an all-in payroll rate rather than income tax alone.
5. State rate (optional): enter a flat percentage if you want a rough state-plus-federal figure.

The result updates instantly. Read your effective rate for "what share of my income goes to tax," and your marginal rate for "what will my next dollar be taxed at."

A second worked example: married filing jointly

Consider a married couple filing jointly with $150,000 in combined wages in 2025. After the $30,000 standard deduction, taxable income is $120,000. Applying the 2025 joint brackets: 10% on the first $23,850 ($2,385.00), 12% on income from $23,850 to $96,950 ($8,772.00), and 22% on the remaining $23,050 up to $120,000 ($5,071.00). Total federal income tax is about $16,228. That is a marginal rate of 22% but an effective rate of roughly 10.8% ($16,228 ÷ $150,000) - even lower than the single filer earning $85,000, because the wider joint brackets shelter more income at the 10% and 12% rates.

Who this calculator is for

An effective tax rate is one of the most useful single numbers in personal finance, and several groups reach for it:

• Budgeters who want to know what share of income actually leaves for federal tax, so they can plan around real take-home pay.
• Job seekers comparing two salary offers, or weighing a raise, who need the after-tax difference rather than the headline number.
• Side-income earners and freelancers estimating how much of a new contract or gig will survive taxes.
• Retirement savers deciding between traditional (pre-tax) and Roth (after-tax) contributions, where your current and expected future rates matter.
• Anyone curious why the "tax bracket" they hear about is not the percentage they actually pay.

Key terms explained

• Gross income: your total earnings before any deductions or taxes - the denominator in the effective-rate formula.
• Taxable income: gross income minus your standard or itemized deduction. The brackets apply to this figure, not to gross.
• Marginal rate: the bracket your last dollar lands in, and the rate on your next dollar earned.
• Effective (average) rate: total tax divided by gross income - the blended result of every bracket.
• Deduction vs credit: a deduction lowers the income that gets taxed; a credit lowers the tax itself, dollar for dollar. Credits move the effective rate far more per dollar.
• FICA: the combined Social Security and Medicare payroll taxes, separate from federal income tax.

What changes your effective rate the most

If you adjust the inputs and watch the number move, a few factors dominate:

• Income level: as you earn more, a larger share of income reaches higher brackets, so the effective rate climbs - gradually, never in a cliff.
• Filing status: joint and head-of-household filers get wider brackets and a larger standard deduction, lowering the rate at the same income.
• Deduction size: a bigger standard or itemized deduction shrinks taxable income and pulls the rate down.
• Pre-tax contributions: 401(k), traditional IRA and HSA dollars are excluded from taxable income, lowering both the tax and the rate.
• FICA and state tax: turning these on raises the all-in rate well above the federal-income-tax-only figure.

Tips to lower your effective rate

Within the rules, the most effective ways to reduce the tax on a given income are:

• Max out pre-tax accounts: traditional 401(k) and IRA contributions and HSA deposits come straight off taxable income.
• Itemize when it beats the standard deduction: large mortgage interest, capped state and local taxes, and charitable giving can add up.
• Claim every credit you qualify for: the Child Tax Credit, education credits and others cut tax directly - this calculator does not include them, so your real rate may be lower.
• Hold investments long term: long-term capital gains use lower 0/15/20% rates than ordinary income.
• Time income and deductions: bunching deductible expenses into one year, or deferring a bonus, can shift income across tax years.

How the result is used in real life

Your effective rate is the right number for big-picture decisions, while your marginal rate is the right one for incremental ones. When you build a household budget, multiply gross income by (1 minus the effective rate, plus FICA and state) to estimate real take-home cash. When you weigh a $5,000 raise or a side gig, use the marginal rate instead - that is what the new dollars are taxed at. The split also drives retirement planning: if you expect a lower effective rate in retirement, traditional pre-tax savings can win; if you expect a higher one, Roth contributions taxed at today's rate may be better.

Limitations and assumptions

This tool is a planning estimate, not tax preparation. Keep these assumptions in mind:

• It models federal income tax on ordinary (wage) income using the 2025 brackets - not capital-gains rates, the AMT, or self-employment tax.
• It does not apply tax credits (such as the Child Tax Credit or education credits), so your real tax and effective rate are often lower than shown.
• It does not include the QBI deduction or above-the-line adjustments beyond the deduction you enter.
• State tax is a single flat rate; it does not model state brackets, credits or deductions.
• Figures are for tax year 2025; brackets, the standard deduction and FICA limits are adjusted annually for inflation.

How it compares to related calculators

This page answers "what share of my income goes to federal tax?" If your question is different, a sister tool fits better:

• To see the dollar amount of federal tax owed in detail, use the Income Tax Calculator.
• To find the rate on your next dollar or your top bracket, use the Tax Bracket Calculator.
• To estimate net pay per paycheck after all withholding, use the Paycheck Calculator.
• To compare two job offers or model a raise, use the Salary Calculator.
• To project whether you will owe or get money back, use the Tax Refund Calculator.