 faces a major RMD and Medicare IRMAA surcharges that may add up to $42,000 over retirement.){kind=link}
A 73-year-old retiree with $3.2 million sitting in a traditional 401(k) recently ran the numbers on his first Required Minimum Distribution and found a second bill hiding behind the obvious one. The RMD itself is only the start. Once that withdrawal lands on his tax return, it can quietly push his Medicare premiums into a higher bracket, and over the course of his retirement, those Medicare surcharges alone can add up to roughly $42,000. This is the story of how a 73 year old with $3.2 million learned that a large 401(k) balance, while a sign of decades of disciplined saving, can also trigger tax consequences that most retirees never see coming until the notice arrives in the mail.
How the $3.2 Million RMD Is Calculated
Required Minimum Distributions are not optional and not negotiable. Under current IRS rules, RMDs from a traditional 401(k) generally begin at age 73 for retirees born between 1951 and 1959, a threshold set by the SECURE 2.0 Act. The amount owed each year is calculated by dividing the account’s prior year-end balance by a life expectancy factor found in the IRS Uniform Lifetime Table.
At age 73, that divisor is 26.5. Applying it to a $3.2 million traditional 401(k) balance produces a first-year RMD of approximately $120,755. That figure is treated as ordinary taxable income, whether the retiree needs to spend the money or not. As the account continues to grow and the divisor shrinks with age, the dollar amount of future RMDs tends to climb even further, which is part of why so many retirees with large pre-tax balances end up with a growing, rather than shrinking, tax problem.
For a 73 year old with $3.2 million in retirement savings, this single withdrawal can be larger than his entire annual budget in some years, and it arrives automatically, regardless of market conditions or personal spending needs.
Why the Tax Story Doesn’t End With the RMD
Most retirees understand that an RMD is taxed as ordinary income. What frequently catches high-balance savers off guard is the second layer: Medicare’s Income-Related Monthly Adjustment Amount, commonly known as IRMAA.
IRMAA is a surcharge added to standard Medicare Part B and Part D premiums once a retiree’s Modified Adjusted Gross Income crosses specific thresholds. For a single filer, once MAGI exceeds roughly $109,000, IRMAA tiers begin to apply, with the surcharge growing larger at each higher income bracket. A $120,000-plus RMD, when combined with Social Security income, interest, and dividends, is often enough to push a retiree well past the first IRMAA threshold and into a higher tier.
Here is where the surprise multiplies. Up to 85% of Social Security benefits can become taxable once other income rises, meaning every additional dollar pulled from the 401(k) can drag Social Security income into the taxable column as well. Stack a six-figure RMD, a Social Security benefit, and modest investment income together, and it becomes easy to see how a 73 year old with $3.2 million can land in an IRMAA bracket that adds several thousand dollars a year in extra Medicare premiums, a cost that compounds year after year as RMDs continue.
The Two-Year Lookback That Delays the Shock
One of the most misunderstood parts of the IRMAA system is its timing. The Social Security Administration determines IRMAA surcharges using tax return information from two years earlier. That means income reported in 2026 will not affect Medicare premiums until 2028.
This lag is precisely what makes the problem so disorienting for retirees. A large RMD taken this year does not produce a visible consequence right away. Instead, the surcharge notice arrives roughly two years later, often described by retirees as unexpected, since the RMD that caused it has long since been reported and forgotten. By the time the increased premium notice shows up, the income year that triggered it is closed, and there is no way to go back and adjust it.
For a 73 year old with $3.2 million, this delayed feedback loop means the true cost of an early, unplanned RMD decision may not become clear until well into his mid-70s, when adjusting course is far more difficult.
Why Large 401(k) Balances Create a Bigger Problem in 2026
Several forces are converging to make this trap more common this year than in the past. Inflation, as measured by core PCE, has continued its gradual climb, while IRMAA income thresholds have not adjusted at the same pace, meaning more retirees are being pulled into higher brackets than in previous years. At the same time, the household savings rate has declined, leaving fewer retirees with easily accessible taxable brokerage funds to draw from instead of tapping into pre-tax retirement accounts.
Retirees who spent decades maximizing 401(k) contributions, often with the encouragement of employer matches and tax-deferral incentives, are now discovering that the very strategy that built their nest egg is the same one generating a larger-than-expected tax bill in retirement. A 73 year old with $3.2 million represents exactly the kind of saver this dynamic affects most: someone who did everything conventional financial advice recommended, only to find the bill waiting on the other side.
Strategies That Can Reduce the Impact
Retirees facing this situation are not without options, even though the RMD itself cannot be avoided once it is required. A few strategies are commonly used to reduce the downstream tax and Medicare consequences:
- Qualified Charitable Distributions: Retirees age 70½ or older can direct funds, up to an annual limit set by the IRS, straight from a traditional IRA to a qualified charity. This transfer counts toward satisfying the RMD requirement without adding to taxable income, making it one of the most effective tools available to someone already planning to give to charity.
- Roth conversions before RMDs begin: Converting portions of a traditional 401(k) or IRA to a Roth account in the years before age 73 can shrink the balance subject to future RMDs. While the conversion itself is taxed in the year it happens, spreading conversions across several lower-income years can reduce the size of RMDs, and therefore the Medicare surcharges, later on.
- Monitoring MAGI against IRMAA brackets: Because IRMAA operates on a cliff basis, crossing a threshold by even a small amount can trigger the full surcharge for that tier. Retirees who track their projected income each year, factoring in the RMD, Social Security, and investment income, can sometimes make small adjustments, such as timing capital gains or losses, to stay just under a bracket line.
None of these strategies eliminate the RMD requirement itself, but each can meaningfully reduce the size of the tax and Medicare bill that follows it.
Public Interest in RMD and IRMAA Planning
Stories involving large 401(k) balances and unexpected Medicare surcharges have drawn significant attention from readers approaching retirement age, particularly those who spent their careers contributing consistently to employer-sponsored retirement plans. The scenario of a 73 year old with $3.2 million resonates because it reflects a common outcome for disciplined, long-term savers rather than an outlier case. Financial commentators and retirement planning communities have increasingly focused on IRMAA awareness as more baby boomers cross the RMD threshold in the years following the SECURE 2.0 Act’s updated rules.
Final Thoughts
The case of a 73 year old with $3.2 million in his 401(k) is a reminder that reaching a large retirement balance is only part of the planning journey. Required Minimum Distributions are mandatory, predictable in their formula, and unavoidable once the age threshold is reached. What is avoidable, or at least manageable, is the secondary cost created by Medicare IRMAA surcharges, which can quietly add tens of thousands of dollars in expenses across a retirement if left unaddressed.
Retirees with substantial pre-tax retirement savings are well served by reviewing their projected income well before their first RMD year, ideally with the guidance of a qualified tax or financial professional. Understanding how Social Security, RMDs, and investment income interact with IRMAA thresholds can mean the difference between a smooth retirement income plan and a costly surprise arriving two years after the fact.
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