A 70-Year-Old With $1.4 Million Faces a $62,000 RMD That Pushes Him Into a Higher Tax Bracket

At 70, he feels fine. Social Security covers the basics, his IRA is growing, and a $40,000 annual withdrawal keeps things comfortable. But at 73, the IRS will start requiring minimum distributions from that IRA, and the amount it demands will push him into a higher tax bracket, raise his Medicare premiums, and cost him roughly $4,600 more per year in federal taxes. The window to act is open right now, and it closes before he turns 73.

Why the RMD Math Hits Harder Than It Looks

The required minimum distribution (RMD) system requires IRA owners to withdraw a government-calculated minimum each year starting at age 73, under the SECURE 2.0 Act. That age-73 trigger applies to people born between 1951 and 1959; those born in 1960 or later must wait until 75. The logic is straightforward: contributions to tax-deferred retirement accounts come with an immediate income tax deduction, and investments grow without current taxation. The IRS mandates RMDs to ensure that money is eventually taxed as ordinary income rather than deferred indefinitely.

The IRS uses a divisor from the Uniform Lifetime Table to set the annual floor. At 73, that divisor is 26.5, a figure that has remained unchanged since the table was revised in 2022. Assuming 5% annual growth on the $1.4 million IRA, the balance reaches approximately $1.62 million by age 73, which puts the first RMD at approximately $61,132. That figure replaces the voluntary $40,000 withdrawal. The IRS simply requires more.

Right now, his gross income is $38,400 in Social Security plus $40,000 from the IRA. His income is high enough that 85% of Social Security becomes taxable. After applying the standard deduction for a single filer over 65, which is $16,100 base plus the $2,050 age add-on for a total of $18,150, his federal taxable income is approximately $56,000. That produces a federal tax bill of roughly $7,400 and keeps him in the 22% bracket.

At 73, the forced $61,132 RMD replaces the voluntary $40,000 withdrawal. After Social Security taxation and the standard deduction, taxable income rises to approximately $77,000. The federal tax bill climbs to roughly $12,000, pushing him into the 24% bracket. That is approximately $4,600 more per year in federal taxes, caused entirely by the mandatory withdrawal increase.

For 2026, the 22% bracket for single filers covers taxable income up to $105,700, with the 24% bracket beginning above that threshold. The 2026 base standard deduction for single filers is $16,100. Under the One Big Beautiful Bill Act, taxpayers age 65 and older can also claim an additional $6,000 senior deduction for tax years 2025 through 2028. That deduction phases out at a rate of 6 cents per dollar of modified adjusted gross income above $75,000 for single filers, fully disappearing at $175,000. With gross income already above $75,000, this person receives only a partial benefit at current income levels, and the deduction shrinks further during high-conversion years.

The IRMAA Cliff Is the Hidden Risk

The bracket problem is manageable. The Medicare surcharge risk is the one that catches retirees off guard.

IRMAA (Income-Related Monthly Adjustment Amount) is a Medicare premium surcharge that applies when modified adjusted gross income crosses a threshold. For 2026, that threshold for a single filer is $109,000. At $99,532 in gross income at age 73, he sits uncomfortably close to that line. The standard Part B premium is $202.90 per month for those who stay under the threshold.

One strong market year could push the IRA to $1.8 million, forcing an RMD above $68,000 and pushing total income above $109,000. At that point, the first IRMAA surcharge tier adds $81.20 per month to Part B premiums and $14.50 per month to Part D premiums, totaling roughly $1,148 per year in extra Medicare costs on top of the higher tax bill. The timing risk compounds the problem: because IRMAA is assessed based on income from two years prior, a single high-income year at 71 or 72 can trigger surcharges at 73, before the retiree has any opportunity to respond.

Three Years to Act: The Roth Conversion Window

Between ages 70 and 72, there are three full tax years in which he controls his IRA withdrawals entirely. No RMD is required. That is the conversion window. The strategy is to convert a portion of the traditional IRA to a Roth IRA each year, paying tax on the converted amount now. Roth accounts carry no RMDs and produce no taxable income in retirement, so every dollar converted now is a dollar the IRS cannot force out later.

The target is to convert enough to bring the IRA balance down to a level where the age-73 RMD stays below the IRMAA threshold. Converting $80,000 per year for three years reduces the IRA by $240,000 before accounting for taxes paid on conversions, which keeps the projected RMD under control. Conversion amounts also need to be sized carefully against the OBBBA senior deduction phase-out. Adding $80,000 to income during conversion years pushes MAGI well above $75,000, reducing or eliminating that deduction. A tax planner can model the interaction of both thresholds at the same time.

Here is what the approach looks like, year by year:

1. Age 70 (Year 1): Convert $80,000 from a traditional IRA to Roth. This adds $80,000 to taxable income on top of the existing $40,000 withdrawal and Social Security. Sizing the conversion carefully can keep total income within the 22% bracket. Paying tax now at a known rate is preferable to paying at an unknown future rate.
2. Age 71 (Year 2): Repeat the $80,000 conversion. Monitor the IRA balance and adjust if the portfolio grows faster than expected. The goal is to stay below the ceiling of the 22% bracket while steadily reducing the pre-tax balance.
3. Age 72 (Year 3): Final conversion year before RMDs begin. Convert the remaining amount needed to bring the projected age-73 balance below the level that would trigger an IRMAA surcharge. After three years, the IRA is smaller, the Roth is funded, and forced distributions at 73 are meaningfully reduced.

Converting at 22% today beats being forced to withdraw at 24% or higher for the next 20 years, with Medicare surcharges compounding on top.

What to Do First

The most productive first step is calculating the exact conversion amount that keeps taxable income at the top of the 22% bracket each year. With the 22% bracket running to $105,700 in taxable income for 2026 single filers, there is meaningful room to convert without crossing into 24%. The most common mistake is waiting. Once RMDs begin at 73, they cannot be converted directly to a Roth. They must be taken as taxable income first, and only the remaining balance can then be converted. The conversion window exists in the years before RMDs start, and it does not come back.

A fee-only tax planner is worth the cost at this stage. The optimal conversion amount requires projecting IRA growth, Social Security taxation thresholds, IRMAA brackets, and the OBBBA senior deduction phase-out simultaneously. The stakes span tens of thousands of dollars over a 15- to 20-year retirement, and getting the conversion sizing right, with professional input, is likely the highest-return financial decision available during this window.

Editor’s note: This update corrected the OBBBA senior deduction phase-out rate from “6% per dollar” to the accurate figure of 6 cents per dollar of MAGI above $75,000 for single filers, which means the $6,000 deduction fully disappears at $175,000 rather than just above $75,100. It also added the 2026 standard deduction breakdown showing that single filers age 65 and older can claim the $16,100 base plus the $2,050 age add-on for a total base deduction of $18,150, and noted that the standard Part B Medicare premium stands at $202.90 per month for those below the IRMAA threshold.

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