The two-year time machine

IRMAA stands for the Income-Related Monthly Adjustment Amount. In plain English, it is a surcharge tacked onto your Medicare Part B and Part D premiums once your income climbs above a certain line. In 2026, the standard Part B premium is $202.90 a month. But if your modified adjusted gross income tops $109,000 as a single filer or $218,000 as a married couple, you start paying more, and at the high end, the Part B premium alone climbs to $689.90 a month per person.

Here is the part that catches good, careful people off guard. Social Security does not look at this year’s income. It uses a two-year lookback. Your 2026 premium is based on your 2024 tax return. So a decision you made two years ago, long forgotten, reaches forward through time and lands on today’s healthcare bill.

It is a cliff, not a ramp

Most taxes ease in gradually. IRMAA does not. It is a cliff. Go one dollar over a threshold and the full surcharge for that entire bracket kicks in. A single retiree at $109,001 of income pays hundreds of dollars more than one at $108,999. For a married couple, crossing that first line can add roughly $2,300 a year between the two of them, and it repeats every year your income stays high. One dollar. That is the trap.

The Utah home-sale surprise

Now, who actually trips this wire? Rarely someone with steady, modest income. It is almost always a one-time event. A large IRA withdrawal. A big Roth conversion done all at once. An inherited retirement account cashed out. And here in Utah, one event stands above the rest: selling the family home.

Property along the Wasatch Front has appreciated dramatically over the last decade. The couple who bought in Bountiful or Lehi or Sandy years ago may be sitting on a gain far larger than they realize. The federal home-sale exclusion shields $250,000 of gain for a single seller and $500,000 for a married couple, but in this market plenty of long-time owners blow right past those limits. Every dollar of gain above the exclusion lands in your income, and two years later it can shove you over an IRMAA cliff you never saw coming.

And here is the cruelest detail. You can file an appeal with Social Security for a genuine life-changing event, such as retiring or losing a spouse. But a voluntary Roth conversion or the sale of your home does not qualify. You chose it, so you own the surcharge. There is no undo button.

How to sail around the reef

The good news is that the same two-year lookback that traps the unprepared rewards the planner. Because IRMAA is predictable, it can be steered around. A few principles I come back to again and again:

First, think in multiple years, not one. If you need to convert a traditional IRA to a Roth, do it in measured slices across several tax years to stay under the next threshold, rather than one giant conversion that detonates your MAGI. The same logic applies to large withdrawals and to timing a home sale.

Second, build tax diversification before you need it. Retirees who hold money across three buckets — taxable, tax-deferred and tax-free — have the freedom to choose where each year’s income comes from. The retiree with everything locked in a traditional IRA has no such flexibility; every dollar they touch is fully taxable and counts toward IRMAA.

This is where a fixed index annuity can earn its place in the plan. Its growth is tax-deferred, so it does not pile onto your MAGI year after year the way taxable interest does, and you decide when to turn income on rather than being forced into a distribution at the wrong moment. Used thoughtfully, it gives you one more lever to keep your income below the lines that matter.

The headline is simple. A great financial year, a strong market, a profitable home sale is something to celebrate, not regret. But without forward-looking, multiyear tax planning, that good year can quietly raise your Medicare bill for years to come. If you are nearing a big withdrawal, a conversion, or a home sale, let’s map out the income picture first so you don’t hit the reef you could have sailed around.

Lyle Boss, The REAL BOSS Financial, a native Utahn and retirement specialist who has spent decades helping families across Utah and the Mountain West build secure, income-focused retirement plans. Boss Financial, 955 Chambers St. Suite 250, Ogden, UT 84403. Telephone: 801-475-9400. https://www.safemoneylyleboss.com/