Effective Tax Rate Calculator

What this calculator does

You enter your gross income and what you actually paid in federal income tax, state and local income tax, and payroll tax. It returns your effective rate for each of those separately and combined, your take-home, tax per thousand dollars earned, how many days of the year you worked to cover the bill, and the gap between your marginal bracket and your effective federal rate.

It does not look up any brackets. You supply the figures, which means the answer is correct in any tax year, any state, any filing status, and it cannot go stale.

Marginal is not effective, and the difference is the whole point

This is the most consequential misunderstanding in personal finance, and it causes people to turn down money.

A progressive tax system does not tax your income at one rate. It slices your income into bands and taxes each band at its own rate. If a bracket boundary sits at $50,000 and you earn $60,000, only the last $10,000 is taxed at the higher rate. The first $50,000 is taxed exactly as it was before you got the raise.

So:

• Marginal rate — the rate on the next dollar. Relevant when deciding whether to work overtime, contribute to a retirement account, or realise a gain.
• Effective rate — total tax divided by total income. Relevant when describing what you actually pay.

Someone in a 22 percent marginal bracket routinely has an effective federal rate of 11 to 14 percent. The gap is not a loophole or a deduction. It is simply what a graduated rate schedule does.

A raise never leaves you worse off. There is no version of the bracket mechanism that takes more than the raise. What can create a genuine cliff is losing an income-tested benefit or credit at a threshold — that is a real effect, and it comes from benefit rules, not from tax brackets.

Include payroll tax, or you are describing someone else’s paycheck

The tax most wage earners actually feel is not the income tax.

Social Security and Medicare are withheld at a flat rate from the first dollar of wages, with no bracket structure and no standard deduction underneath them. For a household in the middle of the income distribution, that payroll bill frequently exceeds the federal income tax bill outright.

Two things follow. First, an “effective tax rate” that excludes payroll tax is a much smaller and much less useful number than one that includes it — and if you are comparing your number against something you read, check which convention it used.

Second, the self-employed pay both halves. An employee sees one share withheld and never sees the employer’s matching share, which economists broadly agree is borne by the worker anyway in the form of lower wages. A sole proprietor pays the whole thing visibly, which is why the self-employment tax calculator exists and why the sticker shock is real.

Use your return, not your paystub

Take the tax figures from your filed return.

Withholding is a projection. Your employer’s payroll system knows your wages and whatever your W-4 told it. It does not know your spouse’s income, your itemised deductions, your capital gains, your side income or your credits.

The difference between projected withholding and actual liability is precisely what a refund or a balance due is. Calculating an effective rate from withholding measures your W-4’s accuracy rather than your tax burden.

Reading the secondary numbers

Tax per $1,000 earned is the same information as a percentage, in a unit that is easier to reason about. “I keep $780 of every thousand” lands differently than “my effective rate is 22 percent,” and it makes comparisons across years or job offers immediate.

Days worked for tax applies your effective rate to the calendar. It is a rhetorical framing rather than an economic one — you do not literally work for the government until some date in April — but it converts an abstraction into something with a scale.

What this leaves out

• Sales and excise tax. Meaningful, regressive, and invisible in an income-based calculation. The reverse sales tax calculator extracts what you paid from a receipt.
• Property tax, directly or through rent. Often the largest state and local bill a household faces — see the property tax calculator.
• The employer’s payroll share, which most economists treat as part of employee compensation.
• Corporate tax incidence, which shows up in prices and wages.
• Tax expenditures. Deductions and credits you receive are already netted into the tax figures you entered.
• Definition of income. Gross, AGI and taxable income are three different numbers, and the denominator you choose moves the answer several points. Be consistent, especially when comparing against published figures.

For the forward-looking version of this — what a given salary leaves you in a given state — see the take-home pay calculator, which is built on maintained state-by-state rate data rather than figures you supply.