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 taking a $40,000 annual withdrawal keeps things comfortable. But at 73, the IRS will start requiring minimum distributions from his 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 fix this is open right now, and it closes at 72.

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. The fundamental logic behind RMDs is tax revenue collection. When you contribute to tax-deferred retirement accounts, you receive an immediate income tax deduction, and your investments grow tax-deferred, meaning the government hasn’t collected taxes on those contributions or earnings. The IRS mandates RMDs to ensure that individuals eventually pay taxes on this money rather than deferring taxes indefinitely.

The IRS uses a divisor from the Uniform Lifetime Table to set that floor. At 73, the divisor is 26.5. Assuming 5% annual growth on the $1.4 million IRA, the balance reaches approximately $1.62 million by age 73, the first RMD lands at approximately $61,132. That replaces the voluntary $40,000 withdrawal; the IRS simply requires more.

Today, 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, and after applying the standard deduction for a single filer over 65, his federal taxable income is approximately $56,000. This makes his federal tax bill roughly $7,400, keeping him in the 22% bracket.

At 73, the RMD replaces the $40,000 withdrawal with $61,132. After Social Security taxation and the standard deduction, taxable income rises to approximately $77,000. This makes the federal tax bill climb to roughly $12,000, pushing him into the 24% bracket. That is approximately $4,600 more per year in federal taxes, simply because the IRS forced a larger withdrawal.

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 standard deduction for single filers is $16,100, with an additional $6,000 deduction available for taxpayers age 65 and older under the One Big Beautiful Bill Act, which covers tax years 2025 through 2028.

The IRMAA Cliff Is the Hidden Risk

The bracket problem is manageable. The Medicare surcharge risk is the one that can ambush him.

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 is sitting close to that line.

One strong market year could push the IRA to $1.8 million, forcing an RMD of over $68,000 and pushing total income above $109,000. The result: more than $1,000 per year in Medicare surcharges stacked on top of the higher tax bill. IRMAA is assessed based on income from two years prior, so a single good year at 71 or 72 could trigger surcharges at 73.

Three Years to Act: The Roth Conversion Window

Between ages 70 and 72, he has three full tax years where he controls his IRA withdrawals entirely. No RMD is required. That is the conversion window. The strategy is straightforward: convert a portion of the traditional IRA to a Roth IRA each year. Conversions are taxable in the year they occur, but Roth accounts carry no RMDs and produce no taxable income in retirement. 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 taxes paid on conversions), keeping the projected RMD under control.

Here’s 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. Stay within the 22% bracket with careful sizing. Pay the tax now at a known rate rather than 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. Stay below the top of the 22% bracket.
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-triggering RMD. 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

Calculate 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 room to convert meaningfully without crossing into 24%. The common mistake is waiting. Once RMDs begin at 73, they cannot be converted to a Roth. They must be taken as taxable income first. The conversion window is the three years before RMDs start, and it does not come back.

A fee-only tax planner is worth the cost here because the optimal conversion amount depends on projecting IRA growth, Social Security taxation thresholds, and IRMAA brackets simultaneously. The stakes are high enough — tens of thousands of dollars over a 15- to 20-year retirement — that getting the conversion sizing right justifies professional input. Pay the man now, so you don’t have to pay the government later.