73-Year-Old With $2.1M Just Found Out His First RMD Pushed Him Into IRMAA Tier Three

A retiree turns 73 and takes his first required minimum distribution (RMD) from a long-untouched traditional IRA. Two years later he opens a letter from Social Security explaining his Medicare premiums are jumping by hundreds of dollars per month. Nothing about his spending changed. Nothing about his investments changed. The tax code simply caught up with 30 years of deferral.

Let’s dive into a case example: A single 73-year-old has $2.1 million in total assets, $1.7 million of it sitting in a traditional IRA, and roughly $42,000 a year in Social Security. His first RMD lands near $64,000 using the IRS Uniform Lifetime Table, which determines these distributions. Stack that on top of taxable Social Security and any portfolio income from his $400,000 in outside assets, and his modified adjusted gross income (MAGI) clears the third IRMAA tier for a single filer.

What IRMAA Tier 3 Costs

For 2026, a single filer with MAGI greater than $171,000 and up to $205,000 pays a Part B surcharge of $324.60 on top of the $202.90 base, for a total monthly premium of $527.50. Part D adds another $60.40 surcharge per month at that tier. The bill arrives with a two-year lag, so the RMD taken at 73 shows up in Medicare premiums at 75, and because RMDs grow each year as the divisor shrinks, the surcharge tends to recur and climb. A lifetime of tax deferral compresses into a forced, escalating taxable income stream that lands when the retiree has the least flexibility to manage it.

Basically, $1.7 million in pre-tax money is too large to draw down gracefully starting at 73. By the early 80s, the required draw on a portfolio that keeps compounding can easily push MAGI into the fourth or fifth IRMAA tier, where the Part B total premium climbs to $649.20 or $689.90 a month.

Two Strategies Worth Considering

For anyone still in their late 60s or very early 70s, the dominant move is to shrink the RMD base before it activates. Two levers to consider:

1. Pre-73 Roth conversions. Converting traditional IRA dollars to a Roth in the years between retirement and age 73 fills the lower brackets voluntarily, at known rates, before Social Security and RMDs stack on top. Every dollar converted is a dollar that never generates a future RMD and never counts toward MAGI again. The trade is paying tax now to avoid a larger, IRMAA-amplified tax bill later. For a $1.7 million IRA balance, even modest annual conversions over five or six years can meaningfully lower the lifetime RMD trajectory.
2. Qualified charitable distributions. A QCD sends IRA dollars directly to charity, satisfies the RMD, and never hits AGI or MAGI. The 2025 QCD limit is roughly $108,000, indexed annually. For a retiree who already gives to charity, routing those gifts through the IRA instead of writing checks from a brokerage account is a great way to neutralize IRMAA exposure on the RMD itself.

Withdrawal sequencing matters too. Pulling from the taxable brokerage first, where only realized gains hit MAGI at preferential capital-gains rates, preserves Roth space and keeps ordinary-income RMDs from being layered on top of fully taxable interest and dividends.

For this retiree at 73, the conversion window is largely closed. The conversion itself counts as ordinary income and worsens the very IRMAA problem he is trying to fix. The realistic plays now are QCDs to blunt the RMD, careful sequencing of withdrawals from the $400,000 outside the IRA, and accepting that the Tier 3 surcharge is the price of a successful deferral strategy that ran a few years too long.