73-Year-Old Faces $280,000 Tax Bill on $1.5 Million 401(k) RMDs

3 articles · Updated · 24/7 Wall St. · May 23

$56,604 is the first required minimum distribution in 2026 for a single retiree born in 1953 with a $1.5 million traditional 401(k), based on the IRS age-73 divisor of 26.5.
17 years of shrinking IRS divisors and assumed 6% portfolio growth drive cumulative RMDs to about $1.4 million by age 90, producing roughly $280,000 in federal tax at an effective rate near 20%.
$109,000 in modified adjusted gross income triggers Medicare IRMAA surcharges, and an RMD layered on top of Social Security and interest income can also make 85% of benefits taxable, pushing the next-dollar marginal rate near 40%.
$111,000 is the 2026 Qualified Charitable Distribution limit, offering the clearest way to satisfy RMDs without raising adjusted gross income; asset location and timing of Roth conversions or other withdrawals can also reduce future hits.
Year-end planning matters because the 2026 RMD will use the Dec. 31, 2025 balance, while Medicare surcharges apply with a two-year MAGI lookback that can turn routine withdrawals into a longer tax cascade.

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