Married or Not in Retirement: The 2026 Tax and IRMAA Difference for Eight Retiree Couples, in Every State

Published 2026-10-28. Tax year 2026 (the return filed in early 2027).

Does getting married in retirement raise or lower your taxes?

It depends on how evenly the income is split. Of 8 retiree pairs priced both ways for 2026, marrying raised federal income tax plus the Medicare IRMAA surcharge for 4, by up to $1,961 a year (M2: Two equal modest incomes), lowered it for 3, by up to $6,228 (M5: One pension income, one Social Security only), and made no difference for 1. Couples with one large and one small income tend to gain from a joint return; two similar incomes can pay more, because three joint-return rules are less generous than two single returns: the Social Security taxation thresholds, the extra standard deduction at 65 and the senior deduction's phase-out. The state line adds up to $4,740 of penalty or $3,322 of bonus.

Price both returns on your own numbers: the 2026 federal income tax calculator
Free: your 2026 federal income tax as a single filer and as a joint return.

The eight pairs

Each person's own 2026 income is the same either way; only the filing changes. Unmarried, each files a single return; married, they file one joint return, with each spouse's own IRA and pension money on the state return (several states tax a couple by each spouse's own income). Everyone is 65 or older and on Medicare, so each person can take the senior deduction (IRC §151(d)(5)(C)) and pays the IRMAA surcharge the year's MAGI sets (the 2026 tiers).

Federal tax and IRMAA, married vs unmarried

Where a penalty comes from. The joint return's ordinary brackets and basic standard deduction are twice the single ones (below the top brackets), but three things are not. The thresholds above which Social Security becomes taxable are well under twice the single ones and are not indexed (IRC §86; IRS Publication 915): married, more of the benefits became taxable for 3 of the 8 pairs, most for M7 ($41,050 unmarried, $61,200 married). The additional standard deduction for age 65 or older is smaller for each married person than for an unmarried one (Rev. Proc. 2025-32). And the senior deduction left after its phase-out was smaller married for 3 pairs (IRC §151(d)(5)(C)). A bonus comes from the other direction: one large income spread over the joint brackets, and the joint IRMAA tiers, which start at twice the single ones, so the larger income's surcharge can disappear.

State tax, every state

State income taxes follow their own marriage rules. Marriage changed the state tax by more than 50 cents in 199 of the 408 pair-state cases: a penalty in 111 and a bonus in 88.

Related: The widow's penalty: the survivor filing-status change · The ACA marriage penalty · Household Social Security claiming · What $1 over an IRMAA tier costs

Download the data

Every case on this page, with its inputs: marriage-penalty-for-retirees-2026.csv (the 8 pairs, federal + IRMAA) · marriage-penalty-for-retirees-2026-states.csv (the 408 pair-state cases) · marriage-penalty-for-retirees-2026.json (both, CC0). Dollar amounts in USD; a positive penalty means marriage costs more, a negative one is a bonus.

Questions

Is there a marriage penalty for retirees?

Sometimes. Of 8 retiree pairs priced both ways for 2026, marriage raised federal tax plus IRMAA for 4 (up to $1,961 a year) and lowered it for 3 (up to $6,228). Most of a penalty comes from three joint-return rules: the Social Security taxation thresholds and the extra standard deduction at 65 are less than twice the single amounts, and the senior deduction phases out sooner for two.

Do two retirees with similar incomes pay more tax if they marry?

They can. Two people each with $26,000 Social Security + $24,000 IRA pay $1,961 more married in federal tax plus IRMAA a year as a married couple than as two single filers.

Does marriage lower taxes when one retiree has most of the income?

Usually. A pair where one has $36,000 Social Security + $50,000 IRA + $30,000 pension and the other $20,000 Social Security pays $6,228 less married married: the larger income is taxed on the wider joint brackets, and the joint IRMAA tiers start at twice the single ones.

Does marriage change Medicare IRMAA?

It can. A joint return is tested against the joint tiers, and each spouse on Medicare pays the surcharge the joint MAGI sets. Marriage raised the IRMAA surcharge for 0 of the 8 pairs and lowered it for 3.

Method and sources

Every figure was computed by QuantCalc's open tax engines (federal 2.5.1, state 1.21.2) and the IRMAA module through the household module the free federal and state tax calculators run, then recomputed by the C engines behind the federal and state tax APIs, from independently written requests, agreeing to the cent. Unmarried = the tax on person A's single return plus person B's; married = the joint return of the same income. The penalty is married minus unmarried, for the federal tax, the state tax and the annual IRMAA surcharge (Part B + Part D for each person). The sources of the rules this study leans on:

• 26 U.S. Code § 86
• Publication 915, Social Security and Equivalent Railroad Retirement Benefits
• 26 U.S. Code § 151
• Public Law 119-21 (One Big Beautiful Bill Act), enrolled text
• Rev. Proc. 2025-32: 2026 inflation-adjusted items (incl. One Big Beautiful Bill amendments)
• 2026 Medicare Parts A & B Premiums and Deductibles
• POMS HI 01101.020: IRMAA sliding scale tables
• Instructions for Form 1040 (2025)

What is not modelled

• Taxes only. Marriage also changes Social Security spousal and survivor benefits, pensions with survivor options, Medicaid and ACA eligibility, and estate planning; none of that is here.
• Everyone takes the standard deduction; no capital gains, dividends, interest or wages, so the 3.8% net investment income tax never applies.
• IRMAA is priced on the 2026 tiers and premiums; the surcharge 2026 income sets is paid in 2028, on tiers not yet published.
• On the joint state return, Social Security is not split between the spouses (the engines read the household figure); IRA and pension money is each spouse's own. Married filing separately, which some states allow on the state return, is not compared.
• The pairs are illustrations, not averages. The Indiana and Maryland figures include the county income tax at the engine's default county rate (Indiana 1.75%, Maryland 3.12%); other local income taxes (city and school-district taxes, and county taxes in other states) are not included.

An estimate, not tax advice. These are computed examples for the 2026 tax year from QuantCalc's open tax engines (federal 2.5.1, state 1.21.2). Your own return depends on facts these examples do not include. Check any decision with your tax preparer before acting.

@misc{quantcalc2026doesgettingmarriedinretirementraiseyourt,
  title  = {Does Getting Married in Retirement Raise Your Taxes? Eight Retiree Couples, Federal, IRMAA and Every State (2026)},
  author = {{QuantCalc Research}},
  year   = {2026},
  url    = {https://quantcalc.app/research/marriage-penalty-for-retirees-2026/},
  note   = {Accessed <date>}
}