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Marriage Tax Penalty or Bonus 2026: When Getting Married Raises Your Tax Bill

Daniel · CountryTaxCalc Updated May 2026
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KEY INSIGHT
The marriage tax penalty or bonus depends entirely on the income split between spouses. Marriage bonus (pay less): when one spouse earns significantly more than the other, or when one spouse earns little or nothing — combining incomes shifts brackets favourably. Marriage penalty (pay more): when both spouses earn similar, high incomes and thresholds that are not doubled for married couples start to bite. For 2026 the married brackets are exactly double the single brackets through the 35% bracket, so the federal bracket penalty arises only in the 37% bracket (single starts at $640,600, married filing jointly at $768,700). Other penalties come from limits that are not doubled, such as the SALT cap, the 3.8% net investment income tax threshold ($250,000 joint vs $200,000 single), and the top Medicare IRMAA tiers.
At a glance

Key Facts

Marriage Tax Bonus: When You Pay Less Married
A marriage bonus occurs when the combined married income results in lower taxes than the sum of two single returns. Scenarios that create a marriage bonus: One-earner couples: one spouse earns $200,000, the other earns nothing — the same $200,000 spread across the married brackets (which are double the single brackets through most income levels under TCJA) reduces the effective rate. Dual-earner couples with large income gap: one earns $150,000, the other earns $30,000. As singles: $150,000 earner is in the 24% bracket; $30,000 earner is in the 12% bracket. As married ($180,000 combined): much of the income falls in the 22% bracket. Single high earner with zero-income spouse: one spouse earns $700,000. As single: 37% on taxable income above $640,600. As married: 37% threshold is $768,700 MFJ — significant bracket benefit on the top portion.
Marriage Tax Penalty: When You Pay More Married
A marriage penalty occurs when the tax on combined married income exceeds the sum of two single returns. The penalty exists when the married brackets are not exactly double the single brackets. 2026 penalty zone at the top: 37% bracket: single starts at $640,600; MFJ starts at $768,700 (less than double = PENALTY). The penalty is most pronounced for two-earner couples where BOTH spouses earn above $640,600 (the single 37% threshold). As married, they hit 37% on combined income above $768,700; as singles, each had the full $640,600 in lower brackets before hitting 37%. Example: two spouses each with $700,000 of taxable income ($1.4M total). As singles: each pays 37% on $59,400 ($700K – $640,600), so $118,800 in total is taxed at 37%. As married: $1.4M – $768,700 = $631,300 is taxed at 37%. That is $512,500 more income taxed at 37% instead of 35%, a penalty of about $10,250.
SALT Cap and Marriage Penalty
For 2026–2029, the One Big Beautiful Bill Act (OBBBA) raised the SALT cap to $40,400 in 2026 (rising 1% a year through 2029) for single and joint filers alike — a married couple gets the same cap as one single filer, so the SALT marriage penalty remains. Under the old $10,000 flat cap (2018–2025): singles each deducted up to $10,000 ($20,000 combined); married couples deducted only $10,000 total — a $10,000 lost deduction costing $2,400 in extra tax at the 24% rate. Under the 2026 OBBBA cap: each single filer can deduct up to $40,400 ($80,800 combined) while an MFJ couple deducts up to $40,400 — a lost deduction of up to $40,400 (about $9,696 at the 24% rate) for couples with large SALT bills. Above $505,000 MAGI the cap is reduced by 30 cents per dollar, down to a $10,000 floor: at $700,000 MFJ MAGI the reduction would be $58,500 ($195,000 × 30%), so the cap falls to the $10,000 floor — high earners in CA/NY/NJ still feel the pinch. For married filing separately: half the applicable amount ($20,200 in 2026). The cap reverts to $10,000 flat in 2030, and the SALT marriage penalty continues at that lower cap.
IRMAA Medicare Surcharge: Hidden Marriage Penalty for Retirees
IRMAA (Income-Related Monthly Adjustment Amount) is an additional Medicare Part B and D premium surcharge for high-income beneficiaries. IRMAA thresholds (2026, based on MAGI from two years earlier): Single: surcharge begins above $109,000; MFJ: surcharge begins above $218,000. The MFJ threshold is exactly double the single threshold through the first four tiers. However, at the top tiers, the married thresholds are less than double the single thresholds, creating a penalty: the top tier starts at $500,000 for singles but $750,000 for joint filers. Example: two spouses with $400,000 of MAGI each are each in the fifth tier ($446.30 a month IRMAA) as singles, but as MFJ their $800,000 combined MAGI puts both in the top tier ($487.00 a month).
ACA Premium Tax Credits and the Marriage Penalty or Bonus
ACA marketplace subsidies create one of the most significant marriage-related tax issues for lower-to-middle-income households. As singles: each person is assessed individually for subsidies based on their own income vs federal poverty level (FPL). Two single individuals with $40,000 each in income may each qualify for significant ACA subsidies. As married ($80,000 combined): the combined $80,000 is compared to the married FPL threshold — eliminating or reducing subsidies compared to single status. The benefits cliff: for couples near the 400% FPL threshold, marriage can trigger sudden loss of ACA subsidies worth thousands annually. This has led to couples intentionally delaying marriage to preserve individual ACA subsidy eligibility — a perverse incentive created by the ACA household income calculation.
Married Filing Separately: When It Helps and When It Hurts
Married Filing Separately (MFS) can sometimes reduce the marriage penalty — but has significant downsides. MFS limitations: most tax credits (EITC, Child and Dependent Care, American Opportunity Credit, Premium Tax Credit) are eliminated or reduced; student loan interest deduction is disallowed; IRA deductibility is severely restricted if either spouse has a workplace plan; Social Security taxation is calculated differently (less favourable); the annual capital loss deduction limit is halved to $1,500. When MFS can help: one spouse has very high income and the other has significant medical expenses that need a lower AGI denominator to clear the 7.5% threshold; avoiding IRMAA surcharges (if one spouse is on Medicare and the other is not, MFS can separate incomes for IRMAA purposes); student loan income-driven repayment (IDR) — MFS keeps the lower-income spouse's IDR payments lower even though it increases taxes.
Introduction

The marriage tax penalty is a real phenomenon — not a myth — but it only applies to certain income combinations. Understanding whether your marriage creates a tax penalty or bonus helps with financial planning before and after marriage. The interaction of tax brackets, the standard deduction, the SALT cap, IRMAA Medicare surcharges, and ACA subsidies all affect the marriage tax calculation. This guide walks through the mechanics of the marriage penalty and bonus at different income levels, the specific traps to watch for, and when Married Filing Separately might be worth considering.

Section 01

Calculating Your Marriage Penalty or Bonus

To determine your specific marriage penalty or bonus, compare taxes under two scenarios: (A) each partner as a single filer on their own income, and (B) as a married couple filing jointly.

Quick Estimate Method

For a rough estimate: calculate each person's single-filer tax; then calculate the combined MFJ tax on total income; compare the totals. The difference is your marriage bonus (negative) or penalty (positive). For couples with roughly equal incomes below the 37% bracket, the federal brackets and standard deduction are exactly doubled, so any penalty comes from limits that are not doubled (SALT cap, NIIT threshold, some credits and phase-outs). For couples with highly unequal incomes, the bonus can be several thousand dollars, depending on income.

OBBBA Changes and 2030 SALT Reversion

The One Big Beautiful Bill Act (OBBBA, 2025) extended TCJA's bracket structure and changed the SALT cap. For marriage penalty planning: the raised SALT cap ($40,400 for single and joint filers in 2026, rising 1% a year through 2029) does not eliminate the SALT marriage penalty: a married couple gets the same cap as one single filer. In 2030, the cap reverts to $10,000 flat regardless of filing status, and the marriage penalty continues at that lower cap. The TCJA bracket structure is extended by OBBBA, so bracket-related marriage penalties and bonuses are broadly stable through at least 2029.

State Marriage Penalties

States also impose marriage penalties or bonuses based on how their brackets compare to the federal structure. State marriage penalties and bonuses vary: California's married brackets are double its single brackets, while other states such as New Jersey use married brackets that are not simply double the single brackets. Research your specific state's bracket structure.

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FAQ

Frequently Asked Questions

Can we avoid the marriage penalty by filing separately?

MFS eliminates the combined income issue but comes with significant costs — loss of EITC, child and dependent care credit, ACA subsidies, IRA deductibility, and worse student loan repayment terms. For most couples, the tax cost of MFS due to lost credits and deductions exceeds the marriage penalty. The exception: if one spouse has very high income and large itemisable deductions that require a low AGI baseline (e.g., large medical expenses), MFS may be worth it. Always calculate both scenarios with a CPA — the MFS vs MFJ analysis needs to include all credits and deductions, not just the bracket comparison.

We're getting married in 2026. What tax issues should we plan for?

Pre-marriage tax checklist: (1) Calculate your projected combined 2026 income and estimate the marriage bonus or penalty; (2) Update your W-4 withholding immediately after marriage — the IRS W-4 worksheets for married filers differ from single; under-withholding as a dual-income couple is common and leads to a year-end bill; (3) Review ACA marketplace coverage — marriage triggers a qualifying life event requiring re-application, and combined income may change your subsidy; (4) Be aware of IRMAA thresholds if you are 63+ (IRMAA is based on income 2 years prior); (5) Update beneficiary designations on retirement accounts and insurance; (6) Consider whether to file jointly or separately for the year of marriage — you can choose either for the year you marry.
Disclaimer:This guide provides general tax information for educational purposes only. Marriage tax penalty and bonus calculations depend on your specific income, deductions, filing status, and state of residence. IRMAA, ACA subsidies, and student loan IDR interactions add complexity. This is not tax advice. Calculate your specific situation before and after marriage with a qualified CPA.
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