6 Income Decisions That Trigger Medicare IRMAA Two Years Later

6 Income Decisions That Trigger Medicare IRMAA Two Years Later

Medicare IRMAA is the only tax bill you get where the decision that caused it is already two years behind you.

Your 2026 Medicare premium is set from your 2024 tax return. Not your current income. Not your retirement income. The return you filed in the spring of 2025, describing a year you may have spent still working, still selling things, still converting an IRA. The letter arrives in November, the premium starts in January, and there is nothing left to change about 2024.

The standard Part B premium for 2026 is $202.90 a month. The income-related monthly adjustment amount, which is what IRMAA stands for, sits on top of that and affects roughly 8% of people with Part B. Here are the six decisions that put people in it, and the one appeal that actually exists.

First, Understand That Medicare IRMAA Is a Cliff

Not a phase-in. A cliff.

One dollar of modified adjusted gross income over $109,000 single or $218,000 joint moves you from $202.90 a month to $284.10, for all twelve months. There is no proration, no partial tier, no credit for having been $1 over instead of $27,000 over.

Here is the full 2026 table for full Part B coverage:

2026 MAGI, single	2026 MAGI, joint	Part B IRMAA	Total Part B premium	Part D IRMAA
$109,000 or less	$218,000 or less	$0.00	$202.90	$0.00
Over $109,000 to $137,000	Over $218,000 to $274,000	$81.20	$284.10	$14.50
Over $137,000 to $171,000	Over $274,000 to $342,000	$202.90	$405.80	$37.50
Over $171,000 to $205,000	Over $342,000 to $410,000	$324.60	$527.50	$60.40
Over $205,000 to under $500,000	Over $410,000 to under $750,000	$446.30	$649.20	$83.30
$500,000 or more	$750,000 or more	$487.00	$689.90	$91.00

Two things to notice. The Part D surcharge runs on the same brackets, so every tier costs more than the Part B column alone. And for a married couple, both spouses on Medicare pay their own surcharge, which doubles the number in the table.

MAGI here is your adjusted gross income plus tax-exempt interest. That second piece catches people who assume municipal bonds are invisible.

1. A Roth Conversion in a Year You Are Already Close to a Line

Conversions are the single most common trigger, and the most avoidable.

The logic for converting is sound: pay tax now at a known rate, remove future required distributions, leave a cleaner asset to heirs. That logic does not disappear. What it usually leaves out is the surcharge, because a conversion is ordinary income and it lands in MAGI in full.

Convert $80,000 in a year when your baseline MAGI is $200,000 joint, and you have not just paid tax on $80,000. You have also moved from no surcharge to the first tier, which for a couple both enrolled in Part B and Part D costs roughly $2,300 across 2026. That does not make the conversion wrong. It makes the size of the conversion a decision rather than a round number, and it is why conversions are often done in slices sized to stop just under a bracket.

The risk in the other direction is real too: waiting to convert can mean converting later at higher rates, or not at all, and nobody knows what future brackets look like.

2. Selling Appreciated Stock or a Property in One Transaction

Capital gains are in MAGI. All of them, long-term included, even though they are taxed at preferential rates.

This is how a retiree with $70,000 of ordinary retirement income ends up in the fourth tier. Sell a rental with $250,000 of gain, and your MAGI for that year has almost nothing to do with your lifestyle. Two years later Medicare prices you as a high earner.

The levers are the ordinary ones and each has a cost. Spreading a sale across two tax years splits the gain but leaves you exposed to price movement. An installment sale spreads income but adds buyer credit risk. Offsetting with harvested losses helps only if you have them. None of these makes the surcharge disappear, and a sale that makes sense should usually still happen.

3. Taking More From a Traditional IRA Than You Need

Most people are careful about this and then hit the year their first required distribution lands on top of a partial year of work income.

The first RMD year is the one to look at closely, because a first distribution can be delayed into the following April, which puts two distributions in one calendar year. That is a legitimate choice and sometimes the right one. It is also a fast way to stack a year and land two tiers higher.

4. Filing Separately While Living With Your Spouse

This is the harshest row in the entire IRMAA structure and it catches people who file separately for reasons that have nothing to do with Medicare.

If you are married, lived with your spouse at any time during the year, and file a separate return, the 2026 brackets are not the ones above. They are:

2026 MAGI, married filing separately	Part B IRMAA	Total Part B premium	Part D IRMAA
$109,000 or less	$0.00	$202.90	$0.00
Over $109,000 to under $391,000	$446.30	$649.20	$83.30
$391,000 or more	$487.00	$689.90	$91.00

One dollar over $109,000 skips three tiers and goes straight to a $446.30 Part B surcharge. If you are considering separate returns for any reason, from a student loan calculation to a medical expense threshold, price this row before you decide.

5. A Deferred Comp Payout, an Option Exercise, or a Business Sale in Your Early Sixties

The two-year lookback means the years that set your first Medicare premiums are the years you turn 63 and 64.

Those are frequently the most concentrated income years of a career. Non-qualified deferred compensation begins paying out. Options get exercised before a retirement deadline. A business gets sold. All of it lands in MAGI, and all of it prices Medicare at 65 and 66.

The planning window is not at 65. It closes at 63. That is the single most useful thing to know in this article, and it is also the reason nobody acts on it, because at 62 Medicare feels like someone else's problem.

6. Assuming You Can Appeal Medicare IRMAA Because You Retired

You can appeal, but only for specific reasons, and "my income went down" is not one of them by itself.

The Social Security Administration uses Form SSA-44 to request a reduction based on a life-changing event. The form's list includes the death of a spouse, marriage, divorce or annulment, work stoppage, work reduction, loss of income-producing property, loss of pension income, and an employer settlement payment. Retiring is a work stoppage, so a genuine retirement that dropped your income is appealable with documentation.

What is not on the list is the choice you made. A Roth conversion, a stock sale, a property sale, an option exercise: these are voluntary events, not life-changing events, and the surcharge stands. There is a separate path to correct an amended or corrected return, which is a different request and worth asking about if your figures actually changed.

If early retirement is the plan, the years before Medicare deserve their own look. See 6 Questions to Ask Before You Retire Early and Bridge to Medicare, and for the other decision with a similar timing trap, 7 Things to Settle Before You Claim Social Security.

Who Does Medicare IRMAA Planning

The work here is unglamorous. It is projecting MAGI two years forward, sizing a conversion to a bracket edge, and knowing which paperwork exists when something legitimately changed.

Bull Oak is a San Diego, California advisory firm founded in 2014, now 12 years in practice with a team of seven, serving clients nationwide. It describes itself as a fee-only fiduciary practice built specifically around the transition into retirement, combining financial planning, investment management, and tax planning and filing.

That last combination is the relevant detail for an IRMAA question. Bracket-edge work needs the tax return and the portfolio decision in the same conversation, and the credentials listed on the firm's profile span both sides: CFP, Series 65, Series 66, Series 7, an MBA, plus Enrolled Agent and CPA. Credentials on Sam's List are self-reported, with verification through FINRA BrokerCheck and the CFP Board where applicable.

The honest constraints. Bull Oak's Sam's List profile does not yet show any client reviews, so there is no review data to cite here and no comparison to draw on that basis. The firm publishes a $1 million investable asset minimum, which puts it out of reach for many people reading this. And no adviser can make a Medicare premium outcome certain. Brackets change every year, the lookback means some of the damage is always already done, and a surcharge avoided in one year can simply arrive in another.

To compare practices, browse the Sam's List financial advisor directory and read what actual clients wrote before you get on a call.

Frequently Asked Questions

What tax year determines my 2026 Medicare premium? Your 2024 federal tax return, filed in 2025. Medicare uses a two-year lookback, so 2026 premiums are based on 2024 modified adjusted gross income, which is adjusted gross income plus tax-exempt interest. If your 2024 income was unusually high, the surcharge applies for all of 2026 regardless of your current income.

What is the standard Medicare Part B premium for 2026? $202.90 a month, with an annual Part B deductible of $283. Beneficiaries with 2024 MAGI above $109,000 single or $218,000 joint pay an income-related monthly adjustment amount on top of that, bringing the total to between $284.10 and $689.90 a month depending on the tier.

Is IRMAA prorated if I only go slightly over a bracket? No. It is a cliff. Exceeding a threshold by one dollar puts you in the full tier for the entire year, for both Part B and Part D. That is why conversions and asset sales are often sized to land just below a threshold rather than at a round dollar amount.

Can I appeal IRMAA after I retire? Often yes. Retirement counts as a work stoppage, which is one of the life-changing events on Form SSA-44, and the Social Security Administration can use a more recent year's income if you document it. Voluntary events such as a Roth conversion or a stock sale are not life-changing events and cannot be appealed on that basis.

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About the author: Kimberly Green is the cofounder of Sam's List, where business owners and high earners find vetted CPAs, financial advisors, and fractional CFOs. She's met one-on-one with 400+ financial professionals and writes from the real data behind thousands of client-advisor matches. Ask her anything about finding an accountant - she's heard it all, including the questions people are afraid to ask.