The IRMAA Two-Year Lookback: Why 2024 Income Sets Your 2026 Medicare Premium

Quick Answer: Your 2026 Medicare Part B and Part D premiums are set by your 2024 tax return. If your modified adjusted gross income two years ago crossed an IRMAA threshold — because of a home sale, a Roth conversion, a large capital gain, or a final year of full-time work — you pay an income-related surcharge on top of the standard $202.90 monthly Part B premium, and a separate add-on for drug coverage. Some of those surcharges can be appealed with form SSA-44, but only for qualifying life-changing events — and a one-time income spike usually is not one.

IRMAA (the Income-Related Monthly Adjustment Amount) surprises more Central Florida retirees than almost any other Medicare rule, because the bill arrives two years after the decision that caused it.

How the lookback works

Social Security receives your tax data from the IRS on a two-year delay. Each fall, it applies your income from two years prior to the coming year's premium:

Premium year	Tax return used	Typical trigger events
2026	2024	Home sale, Roth conversion, capital gains, last full year of salary
2027	2025	First retirement year — often lower, but only if you appeal or wait
2028	2026	Your first fully-retired tax year finally speaks for itself

The thresholds are set annually and step through several tiers — each tier raises both your Part B premium and your Part D surcharge. The letter announcing your IRMAA (an "initial determination") arrives from Social Security, usually in late fall, and many people mistake it for junk mail. Do not throw it away: your appeal rights run from that letter.

The Winter Park special: the house

The single most common IRMAA story we hear in Winter Park and greater Orlando: a couple sells the family home in 2024, downsizes to a condo, and banks a healthy gain. Even with the home-sale exclusion, a large gain above the excluded amount lands in that year's income — and in late 2025 the IRMAA letters for 2026 arrive, one for each spouse. Two surcharges, twelve months each.

Here is the part that matters: a home sale is not an appealable event. SSA-44 relief exists for life-changing events, not income events.

What SSA-44 can and cannot fix

Qualifying life-changing events (appealable):

• Work stoppage or work reduction (retirement is the big one)
• Marriage, divorce or annulment, or death of a spouse
• Loss of income-producing property from a disaster or other event beyond your control
• Loss or reduction of a pension
• An employer settlement from a company closure or reorganization

Not qualifying (the surcharge stands for the year):

• Selling a home or investment property
• Roth conversions and capital gains you chose to realize
• A one-time bonus, severance timing, or business-sale windfall

If you retired in 2025 or 2026, the work-stoppage event lets you ask Social Security to use your more recent, lower income instead of the two-year-old return — often erasing the surcharge entirely. File the SSA-44 with evidence (retirement date letter, estimated current-year income) rather than waiting for the system to catch up.

Planning around the lookback (before it happens)

The lookback rewards people who plan income two years ahead of Medicare milestones:

1. Time large conversions and sales with the thresholds in mind — a conversion split across two tax years may stay under a tier line that a single-year conversion crosses. Your tax professional can model this; the IRMAA tiers are cliff-edged, so one dollar over a line prices the whole year.
2. Watch the two years before you turn 65. Income at 63 sets your first Medicare premium at 65.
3. Both spouses pay. IRMAA applies per person, so one income event can generate two surcharges.
4. It resets every year. IRMAA is not permanent — a high 2024 affects 2026 only. Your 2025 return governs 2027.

The stakes are real but bounded: even at higher tiers, IRMAA is a defined monthly amount, and in 2026 the Part D side of your coverage still carries the $2,100 annual out-of-pocket cap on covered drugs regardless of what premium tier you pay. Surcharges raise premiums; they never reduce benefits — patients at AdventHealth and Orlando Health receive identical coverage whether or not IRMAA applies.

Frequently Asked Questions

How will I know IRMAA applies to me? Social Security mails an initial determination letter, typically in November or December, stating the income year used and your surcharge tiers. Read it the day it arrives — appeal windows are measured from that notice.

I retired this year but my letter uses my old salary. What do I do? That is the textbook SSA-44 case: work stoppage. File the form with your retirement date and a good-faith estimate of this year's income, and Social Security can substitute the lower figure for your premium calculation.

Is there any way to undo a Roth conversion that triggered IRMAA? No — conversion recharacterizations were eliminated years ago, and conversions are not appealable events. The planning has to happen before December 31 of the conversion year, which is exactly why the two-year lookback deserves a place in every pre-Medicare tax conversation.

The bottom line on the lookback

IRMAA is not a penalty and it is not permanent — it is a pricing formula with a two-year memory. That memory is exactly why it belongs in every retirement-income conversation from age 63 onward: the return you file this spring is a Medicare premium decision, whether or not anyone frames it that way. If a letter has already arrived, sort it into one of two piles — life-changing event (file the SSA-44 now) or income event (plan the next tax year so it does not repeat). Either way, the worst response is the most common one: paying the surcharge for years without ever checking which pile you were in.

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Important Notice: We do not offer every plan available in your area. Please contact Medicare.gov or 1-800-MEDICARE (1-800-633-4227) to get information on all of your options.