Marriage Tax Calculator

Getting married changes your filing status, and your filing status decides which standard deduction, which brackets and which caps apply to your income. This page shows the effect in dollars for the 2025 tax year (returns filed in 2026) and the 2026 tax year (returns filed in 2027). To trace a single return from gross income down to taxable income first, use the Taxable Income Calculator; for a full estimate of one return, the Income Tax Calculator is the better fit.

How the marriage tax calculation works

The calculator prepares five returns from what you enter. Two of them assume you stay unmarried: one single (or head of household) return for each partner. One is a married filing jointly return with your incomes and deductions combined. The last two are married filing separately returns, one per spouse. Every return follows the same three steps:

Each return takes whichever is larger, the standard deduction or your itemized deductions. Separate returns get one extra check: IRS Publication 501 does not allow one spouse to claim the standard deduction when the other itemizes, so the calculator prices both spouses with the standard deduction and both itemizing, then keeps the cheaper pair.

Worked example: one income of $120,000

One partner has $120,000 of AGI and the other has no income, tax year 2026. Unmarried, the earner files as single: $120,000 minus the $16,100 standard deduction leaves $103,900 of taxable income. The first $12,400 is taxed at 10% ($1,240), the next $38,000 at 12% ($4,560) and the remaining $53,500 at 22% ($11,770), for $17,570. The partner without income owes nothing.

On a joint return the standard deduction doubles to $32,200 and taxable income drops to $87,800. The first $24,800 is taxed at 10% ($2,480) and the other $63,000 at 12% ($7,560), for $10,040. The couple pays $7,530 less, a bonus worth about 6.3% of their income, because the earner's top rate falls from 22% to 12%. With the 2025 figures the same couple's bonus is $7,724. This is the classic case the joint return was designed for: one income spread across two people's worth of brackets.

Worked example: two $250,000 earners and the SALT cap

Now both partners have $250,000 of AGI in 2026 and each pays $25,000 in state income and property taxes. As single filers, each $25,000 sits under the $40,400 cap, so each partner itemizes, deducts the full $25,000 and has $225,000 of taxable income. The tax on each return is $41,024 on the first $201,775 plus 32% of the remaining $23,225, or $48,456. Together they pay $96,912.

Married, their $50,000 of state and local taxes meets one $40,400 cap, so $9,600 of deductions disappears. Joint taxable income is $500,000 minus $40,400, or $459,600, and the tax is $82,048 plus 32% of $56,050, which is $99,984. That is a marriage penalty of $3,072: exactly the $9,600 of lost deductions times their 32% rate. Separate returns do not help, because each separate return gets half the cap ($20,200) and the two returns again total $99,984. Under the 2025 cap of $40,000 the same couple's penalty is $3,200.

Joint brackets are doubled, except at the top

The table compares the 2026 bracket thresholds. Every joint threshold up to the start of the 35% rate is exactly twice the single one, and the joint standard deduction ($32,200) is twice the single amount ($16,100) as well.

Because the lower brackets double, two partners with equal incomes pay exactly what two single filers pay, and unequal incomes earn a bonus as the higher income spills into the lower earner's unused room. Only the 37% rate breaks the pattern: it starts at $768,700 of joint taxable income instead of twice $640,600 ($1,281,200), so joint income between those two points is taxed at 37% rather than 35%. With the standard deduction the largest possible bracket penalty is 2% of $512,500, or $10,250 for 2026 ($10,022 for 2025, when the thresholds were $626,350 and $751,600).

The next table puts numbers on the pattern. Each cell is the joint tax minus the two single returns for 2026, with the standard deduction, both partners under 65 and both filing as single when unmarried. Negative values are bonuses, positive values penalties.

Read across any row: equal incomes are neutral until the 37% zone, a 60/40 split is close to neutral, and the bonus grows with the gap between the two incomes. The one-earner bonus stops growing at about $39,750 once the joint return also reaches the 37% bracket, because from there every extra dollar is taxed at 37% either way.

The SALT cap counts once per return

The second big source of penalties is the cap on state and local taxes (SALT): income or sales tax plus property tax. For 2026 the cap is $40,400 per return ($20,200 if married filing separately), reduced by 30% of the income above $505,000 ($252,500 for separate returns) but never below $10,000 ($5,000). For 2025 the figures are $40,000, $500,000 and the same floor. The threshold is the same for a single filer and a married couple, which hurts high-earning couples twice. The table shows the 2026 penalty for two partners with equal AGI who each pay the SALT amount shown and have no other itemized deductions.

At $400,000 each, the couple's joint AGI of $800,000 pushes the joint cap down to the $10,000 floor, so even $20,000 of SALT each costs $2,730: unmarried, both partners itemize $20,000; married, the joint return falls back to the $32,200 standard deduction. At the two lower incomes, $20,000 each still fits under one $40,400 cap, so nothing is lost.

Single parents and head of household status

Head of household is a filing status for unmarried people who pay more than half the cost of a home for a qualifying person, usually a child. It comes with a larger standard deduction ($24,150 for 2026) and wider lower brackets than single status, and it ends when you marry. Take a parent with $60,000 of AGI filing as head of household and a partner with $60,000 filing as single. The parent's taxable income is $35,850 and the tax $3,948; the partner's taxable income is $43,900 and the tax $5,020, for $8,968 in total. On a joint return, $120,000 minus $32,200 leaves $87,800 of taxable income and $10,040 of tax: a penalty of $1,072, even though the incomes are equal. The child tax credit would be the same either way here, and a parent with one child and $60,000 of income is already past the 2026 earned income credit range, which ends at $51,593. At lower incomes the credit can add a much larger penalty.

Other places a marriage penalty hides

• Earned income tax credit. For 2026 the credit for one child begins to phase out at $23,890 of income for single and head of household filers and at $31,160 on a joint return, only $7,270 higher instead of twice as high. Two modest earners can lose a credit that one of them would receive alone. This calculator leaves credits out, so check the EITC separately.
• Age 65 or older, or blind. The additional standard deduction for age 65, and again for blindness, is $2,050 per box for an unmarried person in 2026 but $1,650 per married spouse ($2,000 and $1,600 for 2025). Two retirees with $60,000 of AGI each pay $4,054 each as singles and $8,204 jointly, a $96 penalty. The $6,000 senior deduction (2025 to 2028) is neutral because its phase-out starts at $75,000 per single return and $150,000 per joint return, but separate returns cannot claim it.
• Tips. On the 2025 Schedule 1-A the qualified tips deduction is capped at $25,000 per return, with no higher amount for joint returns. Two tipped workers with $25,000 of qualified tips each could deduct $50,000 as singles but $25,000 married. The overtime deduction cap doubles ($12,500 single, $25,000 joint), so it is neutral.
• Surtaxes on high incomes. The Net Investment Income Tax and the Additional Medicare Tax start at $200,000 for single filers but $250,000 for joint filers, not $400,000. These are separate taxes and are not part of this calculator.
• Child tax credit. Its phase-out begins at $400,000 for joint filers, exactly twice the $200,000 threshold for everyone else, so it rarely creates a penalty.

Married filing jointly vs. married filing separately

Once married, a couple files jointly or separately; single status is no longer available, and head of household is possible only for a spouse who lived apart for the last six months of the year and meets the other tests. Separate returns almost always cost more. Their brackets match the single brackets up to 35%, but the 35% bracket ends at $384,350 for 2026, half the joint threshold. The SALT cap is halved, the senior, tips and overtime deductions are not allowed, and Publication 501 lists further losses: no student loan interest deduction, no education credits, a restricted earned income credit, a child tax credit that phases out at half the joint income level, and a $1,500 limit on deducting capital losses instead of $3,000.

Separate filing can still make sense when one spouse has large medical bills, because the 7.5% of AGI floor is measured against that spouse's smaller separate AGI, or when each spouse wants to be responsible only for their own return. The calculator shows the separate total next to the joint tax so you can see what that independence costs.

How to use the calculator and who it is for

1. Pick the tax year. 2025 uses the brackets for returns filed in 2026; 2026 uses the brackets for returns filed in 2027.
2. Enter each partner's AGI. Wages and other taxable income minus pre-tax 401(k), HSA and similar amounts. If you are unsure, the AGI Calculator builds the figure from your pay stub totals.
3. Tick the boxes that apply. Age 65 or older by December 31, blindness, and head of household status if a partner would qualify while unmarried.
4. Add itemized deductions if you have them. State and local taxes, mortgage interest and cash gifts to charity, entered per person.
5. Read the result. The headline shows the penalty or bonus, the side-by-side table shows deductions, taxable income, tax and effective rate for each option, and the split table shows how the answer changes if the same total income were divided differently.

The tool is for engaged couples weighing the tax side of a wedding date, newly married couples deciding between joint and separate returns, and couples whose incomes are about to change because of a raise, a business, retirement or a child. Financial planners and tax preparers also use it to explain where a penalty comes from before running full software.

Key terms

• Marriage penalty: extra tax on a joint return compared with two single returns.
• Marriage bonus: tax saved on a joint return compared with two single returns.
• Adjusted gross income (AGI): total income minus adjustments such as deductible IRA and HSA contributions; the starting point for every return here.
• Standard deduction: the flat deduction for your filing status: $16,100 single, $32,200 joint and $24,150 head of household for 2026.
• Itemized deductions: listed expenses such as state and local taxes, mortgage interest and charity, used instead of the standard deduction when they are larger.
• SALT cap: the limit on deducting state and local taxes, applied once per return.
• Head of household: a status for unmarried people supporting a qualifying person, with a bigger deduction and wider brackets than single status.
• Marginal rate: the bracket your last dollar of taxable income falls into.
• Effective rate: total income tax divided by income.

What changes the result, and tips around the wedding

The income split matters most: the bigger the gap, the bigger the bonus. Itemized deductions decide whether the SALT cap bites, age adds the 65-or-older effects, head of household status adds a penalty for single parents, and the tax year moves every threshold. A few practical points follow from the rules:

• Your marital status on December 31 decides your filing status for the whole year, so a December wedding counts as married for all of that year.
• After the wedding, update both Forms W-4. If both of you work and each form simply switches to married filing jointly without the multiple jobs step, too little tax is usually withheld; the Tax Withholding Calculator helps you check.
• Run both tax years. The 2026 figures are a little higher than 2025, and a raise or a new job can move you across a threshold.
• If you have children or modest incomes, check the earned income tax credit and the child tax credit as well, because credits can outweigh the bracket effects shown here.

Limitations

The calculator compares regular federal income tax on ordinary income. It does not include tax credits, the lower rates on long-term capital gains and qualified dividends, the Net Investment Income Tax, the Additional Medicare Tax, the alternative minimum tax, self-employment tax or state income taxes. It treats the AGI you enter as final, so AGI-based rules that change with filing status (such as the IRA deduction phase-out) are not recalculated. The 2026 limit on itemized deductions in the 37% bracket uses the 5.4% factor from the IRS estimated tax worksheet. For a full return, use tax software or a tax professional; for state income tax, the State Income Tax Calculator gives a separate estimate.

Related calculators

• Follow one return from gross income to taxable income with the Taxable Income Calculator.
• Estimate the full federal tax on one return with the Income Tax Calculator.
• See which bracket your income reaches with the Tax Bracket Calculator.
• Build your AGI from income and adjustments with the AGI Calculator.
• Compare average and marginal rates with the Effective Tax Rate Calculator.
• Estimate a refund or balance due with the Tax Refund Calculator.

Sources

• Internal Revenue Service, Rev. Proc. 2025-32: 2026 brackets, standard deductions and additional standard deduction; 2025 standard deduction as amended by P.L. 119-21; 2026 earned income credit table.
• Internal Revenue Service, Rev. Proc. 2024-40: 2025 brackets and additional standard deduction.
• Internal Revenue Service, Publication 501: marital status on the last day of the year, married filing separately rules, head of household.
• Internal Revenue Service, Schedule 1-A (Form 1040), 2025: senior, tips and overtime deductions, caps and phase-outs.
• Internal Revenue Service, Instructions for Schedule A, 2025: SALT cap of $40,000 and the phase-down worksheet.
• Internal Revenue Service, Publication 505 (2026): 2026 SALT cap, charitable gift rules, the limit on itemized deductions, and the thresholds for the Net Investment Income Tax and Additional Medicare Tax.
• Internal Revenue Service, Schedule 8812 (Form 1040), 2025: child tax credit phase-out thresholds.