When the Medicare Surcharge Is Based on the Wrong Year
The income-related surcharge on Medicare premiums is assessed from a tax return two years old. For someone who has just retired, that return shows a full working salary — and the premium is set as though they still earn it. A specific procedure exists to have the determination made on current income instead, and it is used by a fraction of the people entitled to it.
- A two-year lag:: The premium is set from a return filed for the year two years before.
- Qualifying events are listed:: Work stoppage or reduction, marriage, divorce, death of a spouse, loss of a pension and certain others.
- Requested on a form:: Form SSA-44, with documentation of the event and an estimate of current income.
- Not every income fall qualifies:: A large one-off gain dropping out of income is not itself a life-changing event.
Where the AI summary above gets this wrong
"The Medicare surcharge is based on your income, so it adjusts when your income falls."
That's surface-true. Here's what it misses:
- It adjusts two years late, and only if you ask — The determination uses a return from two years earlier and does not update because circumstances changed. Someone who retires in one year pays a surcharge based on their final working salary into the next, and the correction has to be requested rather than applied automatically.
- Retirement itself is a qualifying event — Work stoppage and work reduction are on the list, which means the single most common reason for a large income fall is a valid basis for a new determination. The form requires evidence of the event and an estimate of the current year's income — a letter from the employer and a signed statement are frequently enough.
- A dropped one-off gain is not an event — Where the high income came from selling a house or a large Roth conversion, the surcharge applies for that year and falls away naturally two years later. That is not a life-changing event, which is why the timing of a conversion should account for the surcharge two years out rather than relying on an appeal.
01 Why the premium looks wrong
The adjustment is determined from the most recent tax return available, which is the return for the year two years before. Someone paying a 2026 premium is assessed on their 2024 income.
For a working household that lag is invisible. For someone who retired in between, it is the difference between a salary and a pension, and the premium is set on the salary. Both spouses pay it, and it applies to the Part D premium as well as Part B.
The surcharge also works on cliffs rather than a slope: a dollar over a threshold moves the whole premium to the next band, which is why the threshold arithmetic matters so much in the years being measured.
Shows: the total income-related surcharge across the household for the year it applies, which is what a successful request for a new determination removes. Ignores: whether a qualifying life-changing event occurred, the Part D portion where it applies separately, and future years assessed on later returns.
Source: Medicare premiums
02 The events that permit a new determination
The listed events are specific: marriage, divorce or annulment, the death of a spouse, work stoppage, work reduction, loss of income-producing property through a disaster or other event beyond your control, loss or reduction of a pension, and receipt of a settlement from an employer due to closure or bankruptcy.
Retirement falls squarely within work stoppage, which makes this available to almost everyone in the first two years after leaving work. The death of a spouse is also on the list, and that combination — a large income fall and a change of filing status — is where the surcharge is most punishing.
What is not on the list is an income fall with no qualifying cause. A year with a large capital gain produces a surcharge two years later that simply has to be paid, and then falls away.
Source: Form SSA-44: Medicare income-related monthly adjustment amount
03 Making the request
The request is made on Form SSA-44. It asks which event occurred and when, for an estimate of the current year's modified adjusted gross income and the year after, and for supporting evidence.
The evidence is usually straightforward: a letter from an employer confirming the date work stopped, a death certificate, a divorce decree, or a statement from a pension provider. The form can be posted or taken to a local office with the documents.
It is worth filing as soon as the notice of the surcharge arrives, since the adjustment applies from the point the request is granted rather than being fully backdated in every case. And it is worth filing again the following year if the event's effect continues, because each year is determined separately from its own return — the same annual rhythm as the rest of the Medicare calendar.
Source: Medicare costs
This is the most reliably recoverable money in the whole Medicare system, and the request is a single form. If you retired in the last two years and your premium looks high, it is high because it is being charged on your final salary. File SSA-44 with a letter from your employer showing when you stopped, and do it the week the notice arrives. For a couple it is frequently several thousand dollars a year.
FAQ
Why is my Medicare premium based on old income?
The surcharge is determined from the tax return for the year two years earlier, which is the most recent return available when the premium is set. It does not update automatically when income falls.
Does retiring let me have the surcharge reduced?
Yes. Work stoppage is a qualifying life-changing event, so a new determination can be requested on Form SSA-44 using an estimate of your current income, with evidence of the date work ended.
Can I appeal a surcharge caused by a one-off capital gain?
Generally not. A large one-off gain is not a life-changing event, so the surcharge applies for that year and falls away two years after the income does.
Sources
Regulator references
- Form SSA-44: Medicare income-related monthly adjustment amount · Social Security Administration · 2026The form used to request a new determination after a life-changing event.Last verified: 2026-09-07
- Medicare premiums · Social Security Administration · 2026How the income-related surcharge is determined and from which year's return.Last verified: 2026-09-07
- Medicare costs · Centers for Medicare & Medicaid Services · 2026The premiums the surcharge is added to.Last verified: 2026-09-07
Calculator unit tests · the assertions this page's worked example is checked against, and their last result
Changelog
- 2026-09-07 — initial publish (new format)
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Jordan Reeves
Founder of Talk Through Wealth. A software engineer for over a decade before turning to retirement planning, Jordan built the projection engine after watching family members get fragmented, country-by-country advice that never reconciled. He writes about retirement the way the engine computes it: month-by-month, lifetime-long, and skeptical of any rule of thumb that hasn't been run through the math.