The marriage tax in 2026 is usually a bonus for one-earner couples and a penalty for equal high earners and middle-income retirees.
The marriage tax is the gap between what a married couple owes on a joint return and what the same two people would owe filing single. In 2026 joint brackets are exactly double single brackets through 32%, so most couples break even or save; penalties come from the 37% bracket, surtaxes, the SALT cap and Social Security thresholds.
By Craig Wear, CFP® | Last reviewed: October 14, 2026
Key Takeaways
- Every 2026 joint bracket threshold through the 32% rate is exactly twice the single threshold (the 32% bracket tops out at $512,450 joint versus $256,225 single), but the 37% rate starts at $768,700 joint, only 1.2 times the $640,600 single figure (IRS Rev. Proc. 2025-32).
- Social Security benefits start becoming taxable above $32,000 of provisional income for a joint return versus $25,000 for each single filer, so two retirees lose $18,000 of combined tax-free room by marrying (IRS Publication 915).
- The 3.8% net investment income tax and the 0.9% Additional Medicare Tax both start at $250,000 for joint filers versus $200,000 for each single filer, and these thresholds are not doubled (IRS NIIT).
- The 2026 SALT deduction cap is $40,400 for a single filer and the same $40,400 for a married couple filing jointly (IRC 164(b)(7)).
- The $6,000 senior deduction phases out above $75,000 of MAGI ($150,000 joint), but on a joint return each spouse’s $6,000 shrinks by 6% of the couple’s combined excess, so a two-senior couple loses it twice as fast (IRS Schedule 1-A).
- In a hypothetical 2026 example, two 67-year-olds each with $30,000 of IRA income and $24,000 of Social Security owe an estimated $2,184 more federal income tax married than single (Q3 Advisors calculation from Rev. Proc. 2025-32 and IRC 86).
Where the 2026 Marriage Penalty Still Lives
A threshold creates a marriage penalty when the joint figure is less than twice the single figure. Federal figures for tax year 2026.
What is the marriage tax?
The marriage tax is the change in a couple’s total federal tax caused by switching from two single returns to one married return. When the joint return costs more, it is a marriage penalty; when it costs less, it is a marriage bonus.
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Filing status is set by marital status on December 31. Under IRS Publication 501, a couple married on the last day of the year is treated as married for the whole year, so a December wedding changes the entire year’s return.
Separate returns rarely undo a marriage penalty, and filing single while married is not an option; that error is covered in the penalty for filing single when married.
Do single people pay more taxes than married couples?
Single people pay more than a married couple only when the couple’s incomes are uneven; when two spouses earn similar amounts below the 35% bracket, the tax is identical either way. The reason is mechanical: the joint brackets are twice as wide as the single brackets for most of the income range.
A one-earner couple gets the biggest bonus. In 2026, a single filer with $150,000 of wages has $133,900 of taxable income and owes an estimated $24,734. If that person marries a spouse with no income, joint taxable income is $117,800 and the tax is an estimated $15,340, a bonus of $9,394 (hypothetical, computed from Rev. Proc. 2025-32).
Which 2026 tax thresholds are not doubled for married couples?
The 2026 thresholds that are not doubled for joint filers are the source of every marriage penalty, and they cluster at the top of the bracket table and in surtaxes, deductions and benefit formulas. The table below sets each joint figure against two single filers.
| 2026 item | Single filer | Married filing jointly | Joint as share of 2 singles | Effect of marriage |
|---|---|---|---|---|
| Standard deduction | $16,100 | $32,200 | 100% | Neutral |
| Top of 24% bracket | $201,775 | $403,550 | 100% | Neutral |
| Top of 32% bracket | $256,225 | $512,450 | 100% | Neutral |
| 37% bracket starts above | $640,600 | $768,700 | 60% | Penalty |
| 0% long-term capital gains rate up to | $49,450 | $98,900 | 100% | Neutral |
| 15% capital gains rate up to | $545,500 | $613,700 | 56% | Penalty |
| AMT exemption | $90,100 | $140,200 | 78% | Penalty |
| NIIT and Additional Medicare Tax threshold | $200,000 | $250,000 | 63% | Penalty |
| SALT deduction cap | $40,400 | $40,400 | 50% | Penalty |
| Capital loss deduction against ordinary income | $3,000 | $3,000 | 50% | Penalty |
| Social Security base amount | $25,000 | $32,000 | 64% | Penalty |
| Additional standard deduction, age 65+ (per person) | $2,050 | $1,650 | 80% | Penalty |
| Roth IRA phase-out begins | $153,000 | $242,000 | 79% | Penalty |
| Medicare IRMAA top tier starts at | $500,000 | $750,000 | 75% | Penalty (top tier only) |
Sources: bracket, capital gains, AMT and age-65 figures from Rev. Proc. 2025-32; capital loss limit from IRS Topic 409; IRMAA tiers from the CMS 2026 premium fact sheet. The full rate tables are in the 2026 federal income tax brackets guide.
A common claim is that brackets are doubled “up to 32%.” In fact every boundary through the top of the 32% rate is doubled, so the 35% rate starts at $512,450 joint, exactly twice $256,225; only the 37% threshold breaks the pattern.
How much is the marriage penalty in 2026? Six worked examples
For most couples the 2026 income-tax marriage penalty is zero, and the bonus can run to several thousand dollars; real bracket penalties appear only when joint taxable income passes $768,700, and retirees can face penalties at far lower incomes. These hypothetical examples use the standard deduction and federal tax only.
| Hypothetical household (2026) | Tax as two singles | Tax married filing jointly | Marriage penalty or bonus |
|---|---|---|---|
| One earner, $150,000 wages; spouse $0 | $24,734 | $15,340 | Bonus of $9,394 |
| Uneven earners, $300,000 and $100,000 wages | $81,304 | $73,468 | Bonus of $7,836 in income tax, less $450 more Additional Medicare Tax |
| Equal earners, $75,000 each | $15,340 | $15,340 | None |
| Equal earners, $150,000 each | $49,468 | $49,468 | No income tax change; $450 Additional Medicare Tax penalty |
| Equal earners, $450,000 each | $241,269 | $243,251 | $1,982 income tax penalty plus $1,350 more Additional Medicare Tax |
| Two retirees age 67, each $30,000 IRA income and $24,000 Social Security | $3,620 | $5,804 | Penalty of $2,184 |
At $450,000 each, each single filer has $433,900 of taxable income and stays in the 35% bracket, but their combined $867,800 on a joint return pushes $99,100 above the $768,700 joint 37% threshold, costing an extra 2% on that slice.
The $150,000-each case surprises many couples. Neither spouse’s employer withholds the 0.9% Additional Medicare Tax because each salary is under $200,000, yet combined wages of $300,000 exceed the $250,000 joint threshold, so $450 comes due on Form 8959 at filing.
What marriage penalties sit outside the tax brackets?
Outside the brackets, the main marriage penalties in 2026 come from fixed-dollar caps and surtax thresholds that a married couple shares instead of each spouse receiving one. These often matter more than bracket math.
- SALT cap. Under IRC 164(b)(7), the cap is $40,400 for 2026 whether one person or a married couple files, and it shrinks by 30% of MAGI above $505,000 for both statuses (half for separate filers), with a $10,000 floor. Details are in the 2026 SALT cap guide.
- Net investment income tax. The 3.8% tax applies above $250,000 of MAGI on a joint return versus $200,000 per single filer, a threshold set in IRC 1411 that is not indexed for inflation. The NIIT guide shows how it stacks on capital gains.
- Capital losses. Excess capital losses offset only $3,000 of ordinary income per year on a joint return, the same as one single filer (IRS Topic 409).
- Earned income tax credit. The 2026 joint phase-out starts at $31,160 versus $23,890 for other filers with children. A parent of two earning $30,000 who marries a $30,000 earner could see the credit fall from about $6,029 to about $1,242, applying the 21.06% two-child phase-out rate in IRC 32(b) to the Rev. Proc. 2025-32 amounts; IRS tables round slightly differently.
- Mortgage interest. The $750,000 acquisition-debt limit applies per return for a married couple ($375,000 each if separate), while the IRS agreed in AOD 2016-02 to apply the limit per taxpayer for unmarried co-owners after Voss v. Commissioner.
Why do retirees face a bigger marriage penalty?
Retirees face a larger marriage penalty because several retirement tax rules use joint thresholds well below twice the single figure, and those rules hit incomes far lower than the 37% bracket. This matters most for older adults who marry or remarry.
Social Security taxation. Under IRC 86, benefits begin to become taxable when provisional income (other income plus half of benefits) exceeds $25,000 single or $32,000 joint, and up to 85% becomes taxable above $34,000 single or $44,000 joint. Two singles have $50,000 of combined first-tier room; a married couple has $32,000. These amounts are written into the statute and are not adjusted for inflation. The mechanics are in the 2026 Social Security taxation guide.
The retiree example, line by line. Each hypothetical 67-year-old has $30,000 of IRA withdrawals and $24,000 of benefits. As single filers, each has $42,000 of provisional income, $11,300 of taxable benefits and $17,150 of taxable income after the $16,100 standard deduction, the $2,050 unmarried age-65 amount and the $6,000 senior deduction, for an estimated $1,810 of tax each. Married, their $84,000 of provisional income makes $40,000 of benefits taxable, taxable income becomes $52,500, and the joint tax is an estimated $5,804.
The smaller age-65 add-on. Rev. Proc. 2025-32 sets the 2026 additional standard deduction at $2,050 for an unmarried person age 65 or older but $1,650 per spouse for married filers, so a two-senior couple receives $800 less than two single seniors.
The senior deduction phase-out. On Schedule 1-A, each eligible spouse’s $6,000 is reduced by 6% of joint MAGI above $150,000. Two single seniors with $100,000 of MAGI each keep $4,500 apiece, $9,000 in total; married with $200,000 of joint MAGI, they keep $3,000 apiece, $6,000 in total. In a second hypothetical with $76,000 of IRA income and $24,000 of benefits each, the senior deduction and age-65 differences alone produce an estimated $741 penalty. Planning around that phase-out is covered in Roth conversions and the senior deduction phase-out.
Medicare IRMAA. The 2026 Part B surcharge tiers are exactly doubled for joint filers until the top tier, which starts at $500,000 single but $750,000 joint (CMS). The full tier table is in the 2026 IRMAA brackets guide.
What happens to the marriage tax when a spouse dies?
When a spouse dies, the marriage bonus generally reverses: the survivor files a joint return for the year of death and then, unless a dependent child qualifies the survivor for qualifying surviving spouse status for up to two more years, moves to the single brackets with roughly the same retirement income. The 24% bracket ceiling drops from $403,550 to $201,775 and the standard deduction from $32,200 to $16,100. That shift is analyzed in depth in the widow’s penalty, and the household planning side in retirement planning for couples.
How does the marriage tax affect Roth conversion planning?
For many married retirees, the joint return is the widest tax window they will ever have, which is why Roth conversion analysis often focuses on the years both spouses are alive. Joint brackets are twice as wide through 32%, so a couple can fill the 22% or 24% bracket with conversion income that would push a single survivor into higher rates later.
The same retiree penalty rules apply to conversions: conversion income raises provisional income, can make more Social Security taxable and can trim the senior deduction. A financial professional can model whether conversions during the joint-filing years reduce lifetime household tax. Couples weighing separate returns can review Roth conversions when married filing separately, which explains why that route is often costly.
Frequently asked questions
Is there still a marriage penalty in 2026?
Yes, but it is narrow. The 2026 joint brackets are exactly double the single brackets through the 32% rate, so most couples pay the same or less. Penalties remain at the 37% bracket ($768,700 joint versus $640,600 single), the NIIT and Additional Medicare Tax thresholds, the SALT cap, the earned income credit and Social Security taxation.
Do single people pay more taxes than married couples?
A single person usually pays more than a married person with the same income, because the joint standard deduction and brackets are twice as large and the spouse may earn less. Two single people with similar incomes below the 35% bracket generally pay exactly what they would pay married, so neither status is cheaper for them.
At what income does the marriage penalty start in 2026?
There is no single starting point. For wage earners, the Additional Medicare Tax can create a penalty once combined wages exceed $250,000 while each spouse earns under $200,000, and the bracket penalty begins when joint taxable income passes $768,700 with each spouse under $640,600. For retirees, it can start once joint provisional income passes $32,000.
Can married couples avoid the marriage penalty by filing separately?
Usually not. The married filing separately brackets match single only up to $384,350 of taxable income, and separate filers lose the senior deduction, education credits and most earned income credit eligibility. Separate filers who lived together also have a $0 Social Security base amount, which can make up to 85% of benefits taxable.
Does getting married affect how Social Security is taxed?
Yes. Benefits become taxable above $32,000 of provisional income on a joint return versus $25,000 for each single filer, and up to 85% becomes taxable above $44,000 joint versus $34,000 single. Two retirees with moderate income can owe more tax married because their combined tax-free room shrinks from $50,000 to $32,000.
Does the date of the wedding matter for taxes?
Yes. Filing status depends on marital status on December 31, so a couple married on any day of the year, including December 31, is treated as married for the entire year under IRS Publication 501. A couple married on January 1 of the next year files as unmarried for the earlier year.
Is the SALT cap a marriage penalty?
Yes. The 2026 SALT cap is $40,400 for a single filer and the same $40,400 for a married couple filing jointly, so two single homeowners can deduct up to $80,800 combined while a married couple deducts half that. The cap is reduced by 30% of MAGI above $505,000, with a $10,000 floor.
Does marriage change Medicare IRMAA?
Mostly no. The 2026 Part B IRMAA tiers for joint filers are exactly twice the single tiers from $218,000 up to $410,000. The top tier breaks the pattern, starting at $750,000 joint versus $500,000 single, so only very high-income couples face an IRMAA marriage penalty.
Methodology: Thresholds come from primary sources: IRS Rev. Proc. 2025-32, the Internal Revenue Code (sections 32, 86, 151 and 164), IRS Schedule 1-A, IRS Topics 409 and 560, the IRS NIIT page, IRS Publication 501 and 915, IRS AOD 2016-02 and the CMS 2026 Medicare premium fact sheet. Worked examples are hypothetical, assume the standard deduction, no credits, and federal tax only, and were computed with a script from the 2026 rate schedules; Form 1040 Tax Table results under $100,000 can differ by a few dollars. Because this is a YMYL topic, anonymous forum anecdotes and unsourced calculator outputs were excluded.
This article is for educational purposes only and is not individualized investment, tax, or legal advice. Consult a qualified professional about your specific situation.
