Picture a 73-year-old widow who retired at 66, lives on Social Security plus modest portfolio withdrawals, and has watched her traditional IRA grow to $1.9 million. She did not touch the IRA for years because she did not need to.
Now the IRS does. The SECURE 2.0 Act sets the required minimum distribution age at 73 for anyone born between 1951 and 1959, and her first RMD year is 2026.
The number is jarring. Divide $1,900,000 by the IRS Uniform Lifetime Table divisor of 26.5 at age 73 and the mandatory withdrawal comes to $71,698. Add Social Security of roughly $42,000 and her gross income climbs to about $114,000 in a year when she planned to spend perhaps $70,000.
A Case Study
- Age and birth year: 73, born 1953, single filer on Medicare.
- Assets: $1.9 million traditional IRA/401(k), no Roth balance.
- Required action in 2026: $71,698 first RMD by Dec. 31 (or April 1, 2027 if she defers the first one).
- Income trigger: Combined income near $114,000, crossing the $109,000 IRMAA threshold for single filers.
- What is at stake: Federal tax on the RMD plus a multi-year Medicare premium surcharge that arrives with a two-year lag.
The federal tax is painful but predictable. After the $16,100 standard deduction and the $2,050 senior add-on, the marginal hit on the RMD lands somewhere in the 22% to 24% bracket. The One Big Beautiful Bill Act also created a $6,000 senior bonus deduction for tax years 2025 through 2028, but it phases out starting at $75,000 MAGI for single filers. At roughly $114,000 in gross income, this retiree would see that bonus substantially reduced, leaving only a partial offset rather than the full $6,000.
The downstream cost is what catches savers off guard. Medicare uses a two-year lookback, so 2026 income drives 2028 premiums. Crossing into the first IRMAA tier adds $81.20 per month to Part B and $14.50 per month to Part D, totaling about $1,148 per year. Sustain that income across several years of growing RMDs and the cumulative surcharge climbs well above $3,000. Each RMD year that pushes MAGI above $109,000 locks in another 12 months of elevated premiums.
Inflation compounds the squeeze. The 10-year Treasury yield is hovering around 4.5% as of July 2026, which signals that a $1.9 million IRA earning even a modest return will keep growing, pushing future RMD dollar amounts higher every year even as purchasing power is eroded. A $71,700 withdrawal today buys less than the same figure would have two years ago.
Three Moves That Could Change the Outcome
1. Use Qualified Charitable Distributions, immediately. For charitable retirees, QCDs are the single most powerful lever available. The 2026 inflation-indexed limit is $111,000 per year, transferred directly from the IRA to a qualified 501(c)(3) charity. The distribution counts toward the RMD, never appears in AGI, and therefore never touches IRMAA. A $20,000 QCD on a $71,700 RMD shaves the taxable portion to about $51,700 and can drop her below the IRMAA cliff entirely. The One Big Beautiful Bill Act’s new restrictions on itemized charitable deductions make QCDs even more valuable in 2026, since a QCD bypasses both the 0.5% AGI floor and the 35% cap on itemized donations entirely.
2. Start Roth conversions now, even at 73. The window before RMDs balloon further still has value. With the 10-year Treasury yielding around 4.5%, her IRA will likely keep compounding, which means future RMDs will keep growing in dollar terms. Converting $20,000 to $40,000 per year into a Roth at the 22% bracket caps the tax cost at a known rate and steadily shrinks the balance that drives every future RMD calculation.
3. Skip the “defer the first RMD to April 2027” move. Doubling up two RMDs in one calendar year almost always pushes income into a higher IRMAA tier and a higher marginal bracket. For most retirees with balances above $1 million, taking the first RMD in its own calendar year is the cleaner choice. Taking both in 2027 would cost her more in Medicare premiums two years out than the brief deferral saves today.
How to Run the Math
- Verify the divisor and run the actual number. Pull the Dec. 31, 2025 IRA balance and divide by 26.5 from IRS Publication 590-B Appendix B.
- Decide on charitable intent by October. QCDs must be processed through the IRA custodian and arrive at the charity by year end. Waiting until December creates paperwork risk.
- Model 2026 MAGI against the IRMAA brackets, not just the tax brackets. The cheapest dollar of planning is the one that keeps her under $109,000 MAGI. Also model the $6,000 senior bonus phase-out: at $114,000 in income, most of that benefit disappears.
The common mistake is treating the RMD as a tax-only event. The real cost is the Medicare premium that arrives quietly in 2028, then again in 2029, growing right alongside the IRA it was generated from. The math only improves with early action.
Editor’s note: This article was updated to reflect the correct 2026 QCD annual limit of $111,000 (raised from $108,000 in 2025), the accurate Tier 1 IRMAA Part B surcharge of $81.20 per month and Part D surcharge of $14.50 per month (totaling approximately $1,148 per year), and the current 10-year Treasury yield of approximately 4.5% as of July 2026. Context was also added regarding the $6,000 senior bonus deduction phase-out above $75,000 MAGI, and the impact of the One Big Beautiful Bill Act’s new charitable deduction limits on the QCD strategy.
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