What the marriage penalty and bonus really are
The United States taxes married couples as a single unit, and that unit does not always owe what the two people would have owed separately. When the joint bill comes out higher, the gap is called a marriage penalty. When it comes out lower, it is a marriage bonus. Nothing about either is a deliberate charge or reward; both fall out of the arithmetic of a progressive rate schedule applied to pooled income.
Neither outcome is rare. Analysis by the Urban Institute has found married couples split close to evenly between those who pay more and those who pay less, with a smaller group landing near break-even. Which group you fall into is driven far less by how much you earn together than by how that total splits between you.
How this calculator works
The tool builds three complete tax pictures from the same set of figures and then compares them. It runs a full return for each of you as an unmarried filer, adds those two results together, and separately runs one joint return on the pooled numbers. The headline result is the gap:
A positive figure is a bonus, because the two separate returns cost more. A negative figure is a penalty. Each of those three returns is built the same way, in the order the tax code itself follows:
Taxable income = adjusted gross income − the larger of the standard or itemized deduction
Tax = bracket tax on ordinary income + preferential rates on long-term gains + surtaxes − credits
The 2026 figures come from IRS Revenue Procedure 2025-32: a standard deduction of $16,100 single, $24,150 head of household and $32,200 joint; seven brackets from 10% to 37%; long-term gains taxed at 0%, 15% and 20% with the zero-rate band ending at $49,450 of taxable income single and $98,900 joint. Payroll tax uses the Social Security Administration's 2026 wage base of $184,500 at 6.2%, plus Medicare at 1.45% with no ceiling and the 0.9% Additional Medicare Tax above $200,000 single or $250,000 joint. The 3.8% net investment income tax uses the same thresholds.
What each field means
- Salary and business income. Wages, self-employment profit and anything else that counts as earned income. This is the figure payroll tax is charged on, and the one the earned income credit is measured against.
- Interest and ordinary dividends, rental and passive income, short-term gains. All taxed at ordinary rates, and all counted as investment income for the 3.8% surtax.
- Long-term capital gain and qualified dividends. Entered separately because they get the preferential 0%, 15% and 20% ladder. They stack on top of your ordinary income rather than replacing it, so a large salary can push otherwise tax-free gains into the 15% band.
- 401(k), IRA and pre-tax savings. Reduces taxable income but not payroll tax, which is exactly how a real 401(k) deferral behaves on a W-2.
- Filing status before marriage. What each of you would use if the wedding never happened. Head of household matters here: it carries wider brackets and a bigger deduction than single, so a parent who qualifies for it has more to lose by marrying.
- Dependent children. Drives the child tax credit at $2,200 each and sets which earned income credit schedule applies.
- Deduction method. Choosing itemized lets you enter a total in place of the standard deduction, and the calculator uses whichever is larger, since no one is required to take the smaller one. The panel beside that field lists what actually belongs in the total for 2026 and, just as usefully, three things that are commonly added by mistake.
- State and city tax rate. A flat approximation, applied to total income. Useful for seeing the full picture of take-home pay, but not a substitute for a real state return.
- Self-employed. Switches payroll tax from the employee rate to the full 15.3% self-employment rate on 92.35% of earnings, and takes the deduction for one half of that tax.
Why unequal incomes usually produce a bonus
Picture one spouse earning $130,000 and the other earning nothing. Filing single, that $130,000 climbs the full ladder and the top of it is taxed at 24%. Filing jointly, the brackets are twice as wide, so the same money is taxed mostly at 10% and 12% and never reaches 24% at all. Nothing was earned or spent differently; the income simply had two sets of low brackets to fill instead of one.
This is why single-earner households see the largest bonuses, and why the effect shrinks steadily as the two incomes converge. Run the default figures in the calculator and then move $10,000 from one spouse to the other: the bonus grows as the gap widens and fades as it closes. At an exact 50-50 split, most couples in the ordinary brackets land within a few dollars of neutral, because the joint brackets through 32% are precisely double the single ones.
Where the penalty still bites in 2026
The 2017 tax law, made permanent in 2025, doubled the joint brackets up through 32% and removed most of the mid-income penalty that older articles still describe. What survives sits in three specific places:
- The top two brackets. The 35% rate starts at $256,225 single but $512,450 joint, which is double and therefore harmless. The 37% rate starts at $640,600 single and $768,700 joint — not double. Two people earning $500,000 each pay 35% at the top as singles and are pushed into 37% together.
- The Additional Medicare Tax. The 0.9% surtax begins at $200,000 for a single filer and $250,000 for a couple, not $400,000. Two people earning $150,000 each owe nothing as singles and $450 a year once married. This threshold is written into statute and is not indexed for inflation, so it catches more couples every year.
- The net investment income tax. The 3.8% surtax uses the same $200,000 and $250,000 thresholds, with the same result for couples holding taxable investments.
- The state and local tax cap. For 2026 the SALT deduction is capped at $40,400, and that figure does not change when you marry. Two single filers can deduct up to $80,800 between them; the same two people as a couple are held to $40,400. For itemizers in a high-tax state this is often the single largest penalty on the list.
Credits move the number more than brackets do
For most households the largest marriage effect is not a rate at all. The earned income credit is measured against household income, and its joint thresholds are nowhere near double the single ones: in 2026 the credit for one child runs out at $51,593 for an unmarried filer and $58,863 for a couple. Two parents each earning $30,000 can each qualify separately and then find the credit substantially reduced once their incomes are pooled. That single line can dwarf every bracket effect on the page.
The child tax credit behaves better. At $2,200 per child it starts phasing out at $200,000 for a single filer and $400,000 for a couple, exactly double, so it is close to neutral for the couples who receive it. Its refundable portion is capped at $1,700 per child, which is why a family with little tax to offset does not always collect the full $2,200 — a detail the calculator applies.
What this calculator does not cover
Being clear about the edges matters more than pretending there are none. This tool does not model married filing separately, the alternative minimum tax, the qualified business income deduction, the state and local tax cap, itemized deduction interactions, Social Security benefit taxation, the senior deduction, education or dependent care credits, or any real state tax code. It treats every dependent as a qualifying child under 17, so families claiming the $500 credit for older dependents will see a slightly generous result. It assumes both spouses are covered by the same tax year and are US residents filing a standard return.
The state and city figure is a flat percentage of total income. Real state systems have their own brackets, deductions and filing statuses, and several create marriage penalties considerably sharper than the federal one. Treat that row as a rough scaling of take-home pay, not as a state tax estimate.
A note on accuracy
Every figure in this calculator is checked against the source documents rather than copied from another tool. The brackets, standard deductions, capital gains bands, child tax credit and earned income credit tables all come from IRS Revenue Procedure 2025-32; the wage base comes from the Social Security Administration.
One thing worth flagging, because it explains why our numbers may not line up with some other marriage calculators you find: several of them subtract Social Security and Medicare tax from federal taxable income. Employees cannot do that. Only the self-employed get a deduction, and only for one half of their self-employment tax. A calculator that makes this mistake understates federal tax by several hundred to several thousand dollars a year. Some also leave the child tax credit out altogether, which matters enormously for families. We have implemented the rules as written.
Frequently asked questions
Does getting married raise or lower your taxes?
It depends almost entirely on how the two incomes compare. When one spouse earns much more than the other, joint filing usually lowers the combined bill, because the lower earner's unused low brackets absorb income that was being taxed at a higher rate. When both spouses earn similar amounts, the result is usually close to neutral in the middle brackets and turns into a penalty at high incomes. Urban Institute research has found the split is close to even across all married couples, with roughly as many paying more as paying less.
What is the marriage penalty in 2026?
A marriage penalty is any situation where a couple owes more filing jointly than the two of them would owe on separate single returns. In 2026 the ordinary brackets from 10% through 32% are set at exactly double the single amounts, so the penalty has largely moved to three places: the 35% and 37% brackets, which are not doubled; the 0.9% Additional Medicare Tax, which starts at $250,000 jointly instead of $200,000 each; and the 3.8% investment income surtax, which has the same problem.
What is a marriage bonus?
A marriage bonus is the opposite result, where filing jointly costs less than two single returns. It comes from income averaging. A single earner on $130,000 pays 22% on the top slice of that income, but the same $130,000 spread across the wider joint brackets is taxed mostly at 10% and 12%. Single-income households and couples with a large earnings gap see the biggest bonuses.
At what income does the marriage penalty start?
For bracket reasons alone, not until combined taxable income passes $768,700 in 2026, where the 37% rate begins for joint filers, well below double the $640,600 single threshold. The surtaxes bite earlier: two people earning $150,000 each pay no Additional Medicare Tax as singles, but owe 0.9% on $50,000 of combined wages once married. Low-income couples can also lose earned income credit through the same mechanism.
Does the standard deduction double when you get married?
Yes. For 2026 the standard deduction is $16,100 for a single filer and $32,200 for a married couple filing jointly, which is exactly twice as much. That is why the deduction itself creates neither a bonus nor a penalty. Everything the calculator shows comes from the rate brackets, the credits and the surtaxes instead.
Should we file jointly or separately after marrying?
Filing separately is rarely the cheaper option. It cuts you out of the earned income credit entirely, restricts education credits and the student loan interest deduction, and narrows the brackets. It can still make sense in specific situations, such as when one spouse has large medical expenses measured against a smaller income, or when income-driven student loan repayment is involved. This calculator compares joint filing with two single returns, not with married filing separately.
Does the date we marry during the year matter?
Only whether you are married on the last day of the tax year. Someone who marries on December 31, 2026 is treated as married for all of 2026, and someone whose divorce is final on that date is treated as unmarried for the whole year. Couples expecting a penalty sometimes delay a wedding into January for this reason, and couples expecting a bonus sometimes move one forward.
What can I include in itemized deductions?
For 2026 the main categories are state and local taxes, capped at $40,400 and covering income or sales tax plus property tax; mortgage interest on up to $750,000 of loan principal borrowed after 2017; charitable donations, with cash gifts allowed up to 60% of adjusted gross income but only the portion of total giving above 0.5% of AGI now counting; and medical costs above 7.5% of AGI. Three things are commonly added by mistake: student loan interest is a separate above-the-line adjustment you receive even on the standard deduction, child care is a credit rather than a deduction, and tuition has been handled through education credits since 2020.
Do tax credits change the marriage penalty calculation?
Often by more than the brackets do. The earned income credit phases out against combined income once you marry, which can wipe out thousands of dollars for a working couple with children, and its joint thresholds are not double the single ones. The child tax credit works the other way and is usually neutral, since its $400,000 joint phase-out is double the $200,000 single figure. This calculator includes both.
This calculator produces estimates for general information only and is not tax, legal or financial advice. It covers federal income tax and payroll tax under 2026 rules and does not replace a prepared return or the judgement of a qualified tax professional. Your actual liability depends on facts this tool does not ask about. For more on how we build and check these tools, see About CalculatorBoss and our Privacy Policy.