Retired Firefighter With $810,000 Discovers Pension Just Triggered an IRMAA Surprise

Picture a 62-year-old retired firefighter living comfortably on a $78,000 public-safety pension. He has $410,000 in a 457(b) and about $400,000 in other savings. The truck needs replacing and the kitchen needs a remodel, so he pulls $60,000 from the 457(b) in a single tax year. Two years later, his Medicare bill arrives with a surcharge he didn’t see coming, and there is no way to reverse it.

This is one of the most common, and costliest, blind spots for retirees with sizable tax-deferred balances. The pension is taxable income on its own. Add a lump-sum 457(b) withdrawal on top of it, and Modified Adjusted Gross Income (MAGI) jumps past the first Income-Related Monthly Adjustment Amount (IRMAA) tier for Medicare. The surcharge then sticks for the entire premium year.

IRMAA is a cliff, meaning one dollar over the threshold triggers the full surcharge for that tier. For 2026, Tier 1 begins at MAGI above $109,000 for single filers and $218,000 for joint filers. Cross that line and the Part B premium climbs from the standard $203 per month to $284, an $81 monthly IRMAA add-on. Part D picks up another $15 per month at the same tier. For a married couple on Medicare, both spouses pay the surcharge, so the household impact roughly doubles.

Social Security uses your tax return from two years prior to set this year’s IRMAA. A 457(b) withdrawal taken in 2026 sets the 2028 Medicare premium. By the time the higher bill shows up, the underlying tax year is closed and the surcharge is locked. You cannot undo it by spending less the following year.

In our example, the firefighter’s pension alone runs roughly $78,000. Add interest from his cash savings plus a sliver of taxable Social Security once he claims, and his baseline MAGI is already nearing the $109,000 single threshold before any voluntary withdrawal. A $60,000 457(b) distribution can easily vault him over Tier 1.

A Strategic Path for People in This Spot

Here are two potential strategies:

1. Front-load 457(b) draws into pre-Medicare years or low-MAGI years. Between retirement and Medicare enrollment at 65, the firefighter has a window where IRMAA doesn’t apply at all. Pulling chunks during those years, or partial Roth conversions if his plan allows rollovers, drains the tax-deferred balance before it can collide with Medicare premiums and eventual Required Minimum Distributions at 73.
2. Spread withdrawals to stay under the Tier 1 line once on Medicare. If pre-65 windows have closed, the goal becomes keeping MAGI just under $109,000 single or $218,000 joint. That may mean smaller, annual 457(b) draws paired with taxable-account spending. Funding a big purchase from after-tax savings in a high-pension year is often cheaper than absorbing two years of IRMAA on top of the income tax bill.

An SSA-44 appeal is worth filing only when a qualifying life-changing event applies: work stoppage, marriage, divorce, or death of a spouse. A voluntary 457(b) withdrawal does not qualify.

What to Evaluate First

Run a MAGI projection for every year from now through age 75 before touching the 457(b). Map the pension, expected Social Security, investment income, and any planned distributions against the IRMAA tiers. The most common mistake here is treating a lump-sum withdrawal as a one-year tax decision when it is actually a three-year decision: the tax bill, plus two years later, the Medicare premium.