Nobody Warned This 72-Year-Old His First RMD Would Cost an Extra $19,000 in Tax

Meet a 72-year-old single retiree with roughly $1 million in a traditional IRA, another couple hundred thousand in taxable and cash accounts, and about $30,000 a year in Social Security. This spring he modeled his first Required Minimum Distribution, and realized his tax bill next year will be roughly $19,000 higher than what he was expecting.

This is one of the most common wealth-stage surprises for retirees. Millions of Americans have most of their savings inside traditional IRAs and 401(k)s. When the RMD switch flips at age 73, forced withdrawals stack on top of Social Security, and higher tax bills arrive.

At age 73, the IRS uniform lifetime table uses a divisor of 26.5. Against roughly $1 million in his IRA, that produces a first-year RMD in the high $30,000s to low $40,000s depending on his Dec. 31 balance. Add the RMD to $30,000 in Social Security plus any interest from CDs or Treasuries, and his provisional income sails past the single-filer breakpoints of $25,000 and $34,000. That triggers the second problem: up to 85% of his Social Security becomes taxable, on top of the RMD itself being fully taxable.

Why the Bracket Math Bites

For a single filer in 2026, the standard deduction is $16,100. The 12% bracket ends at $50,400, and 22% runs from there to $105,700. Before the RMD, his taxable income sat comfortably inside the 12% bracket. Once the RMD stacks with newly taxable Social Security, his top dollars land squarely in 22% territory, and he loses the benefit of the lower brackets he had been living inside of for a decade.

Compound that with IRMAA surcharges on Medicare Part B and D, which key off modified adjusted gross income, and the true marginal cost of the last dollar of RMD is well above 22%. That is how the extra tax bill lands in the neighborhood of $19,000.

Between age 60 and 72, our retiree had a rare gift: low reported income, no RMDs, and flexibility on when to claim Social Security. That is prime territory for filling the 12% or 22% bracket voluntarily by converting IRA dollars to Roth. He missed it because there was no advisor at the table and his target-date fund quietly rebalanced without any tax planning.

(For readers still inside that window, the Roth window playbook walks through how retirees in their 60s can use these low-bracket years before RMDs and Social Security force their hand.)

Two Moves That Still Work at 72

1. Consider partial Roth conversion this year, before the first RMD arrives. He still has one clean tax year left. Converting enough IRA money to fill the 12% bracket (up to $50,400 of taxable income) shrinks the IRA balance that the 26.5 divisor will be applied against next year. Every dollar moved to Roth never generates another RMD. The conversion itself is taxable, but at 12% it is cheaper than the 22%-plus rate he will otherwise pay for the rest of his life.
2. Qualified Charitable Distributions starting at 73. If he gives to charity anyway, sending money directly from the IRA to a qualified nonprofit satisfies the RMD without adding a dollar to adjusted gross income. That potentially keeps Social Security taxation and IRMAA in check. For a retiree with a household spending base near $78,500 a year, even modest QCDs can meaningfully shift the tax picture.

If you’re in this position, get an actual projection of the year-end IRA balance and run the RMD against the 26.5 divisor. Decide before year-end whether to execute a bracket-filled Roth conversion. Don’t wait for the CPA to raise this issue during tax season. By then, the conversion window for this year has closed, the RMD is locked in, and the $19,000 tax bill is unavoidable.

Contact [email protected] for any questions or corrections.