The Surcharge That Arrives Two Years After the Decision.
IRMAA is a cliff, it reads a tax return from two years ago, and almost every planning move that produces a good outcome for a high-net-worth client can trigger it. Here is the mechanism, and where it is worth intervening.
The three features that make it a planning problem
The Income-Related Monthly Adjustment Amount is a surcharge added to a client's Medicare Part B and Part D premiums when income exceeds a threshold. In 2026 it generally begins above $109,000 of MAGI for an individual filer, doubled for joint filers (SSA.gov), on top of the standard Part B premium of $202.90/mo (CMS.gov).
Three structural features are what turn it from a tax into a trap:
- It is a cliff, not a ramp. One dollar over a threshold moves the client into the entire bracket for twelve months. There is no phase-in, so the marginal cost of the last dollar of income can be enormous.
- It looks back two years. The 2026 premium is set from the 2024 return. The bill arrives long after the decision, usually after the money has been spent and the conversation forgotten.
- It hits twice, per person. The surcharge is applied to Part B and Part D. For a married couple both enrolled, one bracket crossed is four surcharges running for a year.
What triggers it, in practice
Every item on this list is something a good advisor does deliberately, for sound reasons, and none of them is wrong. They just have a Medicare consequence attached that is easy not to price.
- Roth conversions. The single most common trigger, and the most painful because the whole point is to do them in the low-income years between retirement and RMDs — which are exactly the years that set the first Medicare premiums.
- A business sale or partnership buyout. Usually the largest single-year MAGI event in a client's life, and usually in their sixties.
- Selling appreciated property. A rental, a second home, a Florida property bought decades ago. Capital gains count.
- Large annuity distributions from non-qualified contracts, where earnings come out first — covered in does annuity income count toward IRMAA.
- Concentrated stock unwinds and the exercise of options.
- Deferred comp landing in a lump rather than over a schedule.
- Working past 62 while claiming, where wages feed both the earnings test and the IRMAA lookback.
The appeal that usually is not available
This is the part worth knowing before a client asks you to fix it after the fact.
Social Security will reconsider using current-year income after a life-changing event, filed on form SSA-44. There are eight: death of a spouse, marriage, divorce or annulment, work reduction, work stoppage, loss of income-producing property, loss of an employer pension, and receipt of a settlement from a current or former employer.
Social Security's own manual is blunt that the list is exclusive, and it names the events that specifically do not qualify: capital gains from the sale of property, lottery and casino winnings, conversion of an IRA, and cashing bonds.
So the conversion you ran and the property they sold are not appealable. They are precisely what the surcharge was designed to capture. What is appealable — and badly under-filed — is the client who simply retired. Work stoppage is on the list, and the year someone stops working is exactly the year their two-year-old return is least representative of their income. If you do nothing else with this page, check whether your recently retired clients filed an SSA-44.
Where to intervene
- Start the clock at 63, not 65. Build the Medicare consequence into the conversion schedule before the first conversion, not after the premium notice.
- Model the bracket edge, not just the tax. Because IRMAA is a cliff, the last few thousand dollars of a conversion can cost more than they save. Knowing where the edge sits changes how much you convert, not whether.
- Consider splitting across tax years. Half in December and half in January is the same money and, sometimes, the entire difference between a surcharge and none.
- Sequence the big one-off deliberately. A business sale cannot usually be moved, but a property sale, an option exercise or a deferred-comp election often can — and a year in which the client is already over the top bracket is the cheapest year to add more.
- Check for a qualifying event every year. Retirement, a spouse's death, a pension loss. These are the ones that get missed.
Our IRMAA calculator shows where a given MAGI lands, and the IRMAA guide covers the mechanics in client-facing language if it is easier to send than to explain.
Frequently asked questions
Does a Roth conversion trigger IRMAA?
It can. A conversion adds to modified adjusted gross income in the year it happens, and IRMAA reads MAGI from two years prior. A conversion at 63 shows up on the client's first Medicare premium at 65. Social Security's own manual names an IRA conversion as an event that does not qualify for relief, so the surcharge stands.
Can a client appeal IRMAA after a large one-time gain?
Not on the gain itself. Social Security's list of life-changing events is exclusive — eight events, including work stoppage, work reduction, marriage, divorce and the death of a spouse — and its manual specifically names capital gains from a property sale, lottery winnings, an IRA conversion and cashing bonds as non-qualifying. Where a qualifying event genuinely happened, form SSA-44 is under-filed and worth the effort.
How much is IRMAA worth avoiding?
It applies to Part B and Part D simultaneously, for twelve months, per person. For a married couple both on Medicare, a bracket crossed is two surcharges on two parts. That is the arithmetic that makes a few thousand dollars of deliberate income timing worth real money.
Is IRMAA permanent?
No, and this is the reassuring half. It is redetermined annually from the most recent return available, so a single elevated year raises premiums for one year rather than for life. The planning question is therefore about which single year absorbs the income, not about avoiding it forever.
At what age does this start mattering?
Age 63. With a two-year lookback and Medicare at 65, the tax year in which a client turns 63 is the first one that sets a Medicare premium — and it is very often the year of a business sale, a retirement package or the start of a conversion ladder.
Bring a live conversion schedule.
An advisor meeting is the fastest way to see where the bracket edge falls for a specific client.
Figures are 2026 plan-year values from SSA.gov and CMS.gov. This page is education for licensed professionals, not tax advice — a client's exclusion ratio, taxable amount and bracket position belong with their CPA.