Marriage Tax Calculator

Marriage bonus, marriage penalty — what actually changes

Since 2018, the federal brackets for married couples filing jointly have been almost exactly double the single brackets, and so is the standard deduction ($32,200 joint vs. $16,100 single in 2026). That design has a consequence most couples find surprising: if two people earn roughly the same and take the standard deduction, marriage changes their federal income tax by almost nothing — the joint return and the two single returns land on the same number, as the defaults in this calculator show (a small penalty appears there once the earned income credit and payroll-tax details enter). The difference shows up at the edges, in two opposite directions.

Where the bonus comes from

When incomes are unequal, the joint return averages them. The lower earner's unused standard deduction and cheap 10% and 12% bracket space absorb income that the higher earner would have paid 22% or 24% on as a single. The extreme case is the one-income couple: $200,000 earned by one spouse costs about $33,300 in federal tax on a single return, but only about $23,200 on a joint return — a marriage bonus near $10,100 a year. Bonuses also appear at modest incomes through the earned income credit: two low earners who each claim the credit separately can lose part of it when their incomes combine, but a single earner with dependents often gains, because the joint phase-out range starts much higher.

Where the penalty hides

The doubling stops at the very top. The 37% bracket begins at $768,700 of joint taxable income — far less than twice the single threshold of $640,600 — so two high earners can owe thousands more as a couple than as singles. The same is true, in smaller print, of the Social Security wage base (each spouse gets their own cap either way, so no change) and of various credit phase-outs that use combined income: at lower incomes, two earners whose combined wages push past an earned-income-credit or education-credit limit can lose credits they would have kept as singles. Penalties are real but narrower than folklore suggests — for most middle-income couples the honest answer is "within a few hundred dollars either way," which is exactly why running your own two numbers beats guessing.

Why almost everyone files jointly

Married filing separately is the third option, and it is usually the worst: brackets and the standard deduction are halved rather than doubled, the earned income credit is generally unavailable, education credits disappear, and if one spouse itemizes, the other must too. It survives for edge cases — shielding a spouse from the other's tax liability, keeping income-driven student-loan payments based on one income, or clearing the medical-expense floor on a lower income. Joint filing also unlocks things singles cannot do at all: a spousal IRA for a non-working partner, a doubled capital-loss and home-sale exclusion capacity, and an unlimited marital deduction for estate and gift purposes — the wealth-transfer benefit that matters most to high-net-worth couples. Note that this calculator compares joint filing with the two-single counterfactual — the right question before marrying, and the one that produces the bonus/penalty figure.

How this estimate works

Each spouse's income is built from salary and business income, interest and dividends, rental and passive income, and capital gains. Pre-tax 401(k) and IRA savings come off the top. The deduction is the 2026 standard deduction for the filing status chosen (or your own total if you switch it off — add up mortgage interest, charitable donations, student loan interest up to $2,500, child care up to $3,000 and tuition up to $4,000 per person). Long-term gains and qualified dividends are stacked on top of ordinary income and taxed at 0%, 15% or 20%. Social Security and Medicare are figured per person on salary and business income — doubled rates if self-employed — and the earned income credit is applied from the dependents entered before the final federal figure. State and city tax is the flat rate you enter, applied to gross income, so it does not change with marital status. Results are estimates for planning, not a substitute for a prepared return.

Frequently asked questions

What is the marriage penalty?

The extra tax a couple pays filing jointly versus as two singles. It concentrates among similar high earners, because the top joint bracket starts well below twice the single threshold.

When is there a marriage bonus?

When incomes are unequal — most dramatically with one earner. The joint return lets the lower earner's unused deductions and low brackets shelter the higher earner's income.

Is married filing separately ever better?

Rarely, and this calculator does not model it: halved brackets, lost credits and matching-deduction rules make it the most expensive status for most couples, outside narrow student-loan or liability situations.

Does the calculator include state tax and credits?

State tax is your flat percentage of each spouse's gross income. Federally, the earned income credit is included; other credits are not, which is why this is an estimator and the Income Tax Calculator exists for full returns.