The $83,000 RMD Problem: Why 67-Year-Olds With Large 401(k)s Can’t Wait Until 73 to Plan
A six-year window exists between retirement and your first required distribution, and most couples burn through it without realizing it controls their Medicare costs, their tax bracket, and how much of their Social Security the IRS gets to touch.
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A recent Reddit thread on r/retirement spread quickly with a title that captured a regret shared by many retirees: “Don’t miss the Roth Conversion window (I did).” The poster had waited until Social Security checks and required distributions stacked on top of each other, leaving almost no room for tax planning. For a 67-year-old couple sitting on $1.8 million in a traditional 401(k) and planning to file Social Security at 70, that window is open right now and it closes faster than most retirees appreciate.
The stretch between full retirement age and the first required distribution at 73 is the last time household income is flexible enough to reshape. Let that window close, and the tax cascade that arrives with the first RMD becomes very difficult to reverse.
The RMD That Lands on Top of Everything Else
At 73, the IRS Uniform Lifetime Table divides the prior-year 401(k) balance by 26.5. If $1.8 million grows to roughly $2.2 million by then at a moderate net return, the first-year RMD comes to about $83,000. It is mandatory, taxed as ordinary income, and lands on top of every other income source the household already carries.
Add Social Security to the pile. A married couple with strong earnings histories who both delay to 70 can collect roughly $80,000 to $90,000 in combined annual benefits, boosted by the 2.8% COLA that took effect in 2026. Layer in dividends and interest from a taxable account and the household clears $180,000 of modified adjusted gross income before any discretionary spending has begun.
The 2026 IRMAA thresholds for joint filers begin at $218,000, then step up at $274,000, $342,000, $410,000, and $750,000. Each tier is a hard cliff. Cross one by a single dollar and the surcharge applies to the full year of Medicare premiums for both spouses.
The Two-Year Lookback Turns Age 67 Into the Decision Point
IRMAA is set using tax returns from two years earlier. Your 2028 Medicare premiums will be based on your 2026 return, and 2029 premiums on 2027. That is why the planning window closes right now for a 67-year-old, not later, when the RMD finally hits.
The surcharges are real money. A couple in the first IRMAA tier pays roughly $2,297 per year in combined Part B and Part D surcharges above the standard premium. Tier two pushes that total to about $5,800 for the couple, and tier three tops $9,000. That surcharge exposure, combined with taxation of up to 85% of Social Security benefits, means a retiree nominally in the 22% federal bracket can face an effective marginal rate approaching 40% on RMD dollars. The standard Part B premium alone is $202.90 per month in 2026, and that is the floor before any IRMAA surcharge is added.
Filling the 24% Bracket Without Tripping the Cliff
The 2026 24% federal bracket for joint filers runs from $211,400 to $403,550, and the standard deduction for a married couple is $32,200. A retired couple with no other income has room to convert north of $220,000 per year and remain inside the 24% band.
The real binding constraint is IRMAA, not the bracket itself. Keeping MAGI on the 2026 return below $218,000 dodges the first surcharge tier entirely. Converting to around that line each year from 67 through 69, then drawing on Roth and taxable buckets while Social Security grows at roughly 8% per year of delay, can move $600,000 to $700,000 out of the traditional 401(k) before benefits and RMDs push income up permanently.
For the taxable account funding day-to-day spending during conversion years, income-focused vehicles help keep the drawdown gentle. Schwab U.S. Dividend Equity ETF (NYSEARCA:SCHD) yields roughly 3.2% as of early October 2026. With the 10-year Treasury now trading above 5%, a laddered bond sleeve carries considerably more appeal than it did during most of the prior decade. Persistent services inflation running at roughly 4% year over year also argues for maintaining meaningful equity exposure through the conversion window.
Three Moves to Make This Quarter
- Project your age-73 RMD by taking your expected 401(k) balance at that point and dividing by 26.5, then layer in projected Social Security. If the combined figure clears the $218,000 IRMAA cliff for joint filers, you have a conversion job to finish before 70.
- Size each annual Roth conversion so your 2026 MAGI lands around $217,000. That fills the 24% bracket and stays below the first IRMAA tier. Note that the One Big Beautiful Bill Act, signed into law in July 2025, made the TCJA income tax brackets permanent. Conversions still make strong mathematical sense as a way to reduce future RMD exposure, even though the concern about a looming bracket sunset has been resolved.
- If crossing the first IRMAA threshold looks unavoidable in a given year, front-load the conversion into a single tier rather than dribbling into two. A fee-only advisor paid a flat retainer earns the fee back on tier management alone once joint MAGI exceeds $218,000.
Editor’s note: This update corrects the Tier 2 IRMAA annual combined surcharge for a married couple to approximately $5,800 and the Tier 3 figure to approximately $9,000, reflecting verified 2026 Part B and Part D surcharge amounts. The 10-year Treasury yield reference was updated from approximately 4.8% to above 5%, and SCHD’s dividend yield was updated to approximately 3.2%, both reflecting current October 2026 market data.
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Marc Guberti is a personal finance writer who has written for US News & World Report, Business Insider, Newsweek and other publications. He also hosts the Breakthrough Success Podcast which teaches listeners how to use content marketing to grow their businesses.
