A married couple whose joint income lands at $218,001 instead of $218,000 does not pay a little more on that extra dollar. The Social Security Administration’s 2026 tables add $81.20 a month to each spouse’s Part B premium and $14.50 to Part D once joint modified adjusted gross income (MAGI) passes $218,000. For two spouses who both carry Part D, the added premiums come to about $2,297 a year.
IRMAA tier and SSA-44 route: The Retirement Tax & Withdrawal Planner holds an IRMAA tier calculator among its four calculators, plus the IRMAA appeal route for Form SSA-44.
Work out which IRMAA tier a joint income lands in →
Where the $218,000 line sits in the 2026 Medicare tables
Medicare’s income-related monthly adjustment amount, known as IRMAA, is a surcharge layered on top of the standard premiums for beneficiaries with higher incomes. The Centers for Medicare & Medicaid Services (CMS) publishes the dollar amounts in its 2026 Medicare Parts A and B premiums fact sheet. The standard Part B premium for 2026 is $202.90 a month, and the first surcharge tier for a married couple filing jointly begins above $218,000. The second joint tier begins above $274,000.
The Social Security Administration (SSA) carries the same schedule on its Medicare premiums page. For the first tier, the SSA lists an extra $81.20 a month for Part B and an extra $14.50 a month for Part D. A spouse in that tier therefore pays $284.10 a month for Part B ($202.90 plus $81.20) instead of $202.90.
The structure is a cliff, not a slope. Joint MAGI of $218,000 or less carries no surcharge, and $218,001 places both spouses in the first tier for the year. The extra dollar is not taxed at a higher rate. It changes which premium column applies, and the difference lands on both spouses at once.
The arithmetic behind about $2,297 a year
The figure in the headline is a calculation from the SSA’s first-tier amounts, not a number either agency prints. Per spouse, the added monthly cost is $81.20 for Part B plus $14.50 for Part D, which is $95.70. For two spouses the total is $95.70 times 2, or $191.40 a month. Over twelve months, $191.40 times 12 equals $2,296.80, which rounds to about $2,297.
The result depends on both spouses being enrolled in Part D, because the Part D surcharge applies only to people who have a Part D plan. If both spouses carry Part B alone, the added cost is $81.20 times 2, or $162.40 a month, which is $1,948.80 a year. If both have Part B and only one has Part D, the added cost is $162.40 plus $14.50, or $176.90 a month, which is $2,122.80 a year.
CMS’s fact sheet says about 8% of people with Medicare Part B pay an income-related amount, so the cliff affects a minority of enrollees. For a household near the line, though, a few thousand dollars of additional income can bring a bill of roughly the same size for the year.
How 2024 income sets premiums paid in 2026
The SSA does not look at current-year income. Its Medicare premiums page says the 2026 determination uses the tax return filed in 2025 for tax year 2024. A couple’s 2026 surcharge, or the absence of one, was therefore decided by a return that had already been filed before the year began.
The same two-year gap runs forward. Income reported for 2026 is the year that would be read for premiums in 2028. What counts is the figure on the return: the SSA-44 form asks for “adjusted gross income” and tax-exempt interest income, which shows the two figures the agency asks about. One-time income that lands on a return, such as a large sale of investments or a big retirement-account withdrawal, can therefore push a joint MAGI over $218,000 for a single year, and the premium tier follows two years later.
Higher tiers add more on top of the first step
The first tier is the smallest of five joint tiers. The CMS fact sheet puts the next joint thresholds above $274,000, $342,000 and $410,000, with the top tier at $750,000 or more. At each step the Part B total rises: $284.10 in the first tier, $405.80 in the second, $527.50 in the third, $649.20 in the fourth and $689.90 at the top. The Part D surcharge climbs alongside, from $14.50 in the first tier to $37.50, $60.40, $83.30 and $91.00.
A couple above $274,000 therefore faces a bigger jump than the one described above, and the same two-year lookback applies at every level.
A two-year-old return sets the premium, and SSA-44 asks for proof of what changed
The lookback creates the main difficulty. A couple that retires or cuts back on work can have a much lower income this year, while Medicare still bills on the higher figure from two years earlier. The SSA’s page on lowering IRMAA says people who had a life-changing event can ask for a reduction using Form SSA-44. It lists marriage, divorce, the death of a spouse, loss of income and an employer settlement payment among those events, and the form itself also names a work stoppage or reduction by the beneficiary or a spouse.
The SSA-44 form asks for evidence tied to the event. For a work change, it calls for an original signed statement from the employer or copies of pay stubs. A marriage needs an original marriage certificate or a certified copy of the public record, a divorce needs a certified copy of the decree, and a death needs a certified copy of the death certificate. The form also asks for estimated adjusted gross income and tax-exempt interest income for the year selected, so the amount that ends up mattering depends on the couple’s own numbers. SSA says to attach the evidence, after which it mails the original documents back, or to show the originals to an SSA employee.
Filing Form SSA-44 with the Social Security Administration is free and needs no paid help, and the two SSA pages linked above are the places to confirm which events and documents apply to a particular household.
Reading an IRMAA notice against a changed income
A surcharge based on a two-year-old return can outlast the income that produced it. The SSA-44 route depends on matching a change in income to a listed event and the evidence that goes with it.
The Retirement Tax & Withdrawal Planner includes the IRMAA appeal route (SSA-44) and four calculators, among them an IRMAA tier calculator, for matching a joint income to a premium tier.
Get the SSA-44 appeal route in The Retirement Tax & Withdrawal Planner →
This article was prepared with AI assistance and checked against the cited Social Security Administration and CMS pages.
