Retirees With Over $1.5 Million in a Traditional 401(k) Are Being Warned About This $43,000 Annual RMD at 73

A 73-year-old with $1.5 million in a traditional 401(k) calculates a first-year required minimum distribution by dividing the balance by 26.5 from the IRS Uniform Lifetime Table, resulting in $56,604. That taxable amount stacks on top of Social Security, pension income, dividends, and interest, and it increases in later years as the divisor declines. By age 80, the divisor drops to 20.2, and a portfolio around $1.6 million can require about $79,208. Over a typical 10 to 15 year horizon, average annual distributions can fall between $43,000 and $60,000, producing substantial federal income tax and additional state tax. Medicare IRMAA can further raise Part B and Part D premiums when modified adjusted gross income exceeds thresholds, using a two-year lookback, and combined with Social Security taxation can push marginal rates near 40% on additional withdrawals.

"A 73-year-old with $1.5 million in a traditional 401(k) divides that balance by the 26.5 factor in the IRS Uniform Lifetime Table and ends up with a first-year required minimum distribution of $56,604. That is taxable income landing on top of Social Security, pension payments, dividends, and interest, and it grows almost every year for the rest of the retiree's life."

"The Uniform Lifetime divisor shrinks every year, so the percentage withdrawn rises even when the balance is flat. By age 80, the divisor falls to 20.2. A portfolio that has grown to roughly $1.6 million by then produces a required withdrawal near $79,208. Across a typical 10 to 15 year RMD horizon on a $1.5 million starting balance, the average annual distribution lands between $43,000 and $60,000, depending on portfolio returns."

"Run that through the 22% federal bracket and you are looking at roughly $113,520 in federal income tax on the RMDs alone over a dozen years. State income tax stacks on top before the cascade starts."

"For 2026, a single filer with modified adjusted gross income above $109,000 (or a couple above $218,000) crosses the first IRMAA tier. The standard Part B premium is $203 a month, but Tier 1 adds about $1,148 per person per year in combined Part B and Part D surcharges. Medicare uses a two-year lookback, so a $56,000 RMD at 73 plus Social Security can trigger higher premiums at 75."

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