Retirees With Over $1.2 Million in a Traditional 401(k) Are Being Warned About This Tax Bomb at 73

"The Uniform Lifetime Table divisor at 73 is 26.5. Applied to today's $1.2 million balance, the first required minimum distribution runs about $45,000. Three years of 5% portfolio growth lift the balance closer to $1.39 million, pushing the first RMD nearer $52,000. That figure is not optional and lands as ordinary income."

"Combine that RMD with $40,800 of annual Social Security benefits and adjusted gross income lands near $93,000. The single 65 and older standard deduction in 2026 is $18,100, the regular $16,100 plus the $2,000 age add-on, so taxable income drifts into the 22% to 24% federal bracket. The federal tax bill alone runs $11,000 to $13,000 before state taxes."

"Up to 85% of Social Security benefits become taxable once combined income clears $34,000 for a single filer, a threshold written into law in 1984 and never indexed. CPI hit 330.3 in March 2026, with inflation still running above the Fed's 2% target. Decades of price growth have hollowed that ceiling out completely."

"At a $93,000 AGI, roughly $34,680 of the $40,800 benefit gets pulled into taxable income. The household ends up taxed on the dollars that funded Social Security in the first place, then taxed again on the benefit those dollars produced"

A retiree with $1.2 million in a traditional 401(k) faces required minimum distributions starting at age 72. At age 73, the Uniform Lifetime Table divisor of 26.5 can produce an initial RMD around $45,000, rising to roughly $52,000 after several years of portfolio growth. The RMD is taxed as ordinary income and combines with Social Security benefits to raise adjusted gross income to around $93,000. With the standard deduction for a single filer age 65 and older, taxable income can fall into the 22% to 24% federal bracket, creating an estimated $11,000 to $13,000 federal tax bill before state taxes. Social Security taxation thresholds from 1984 are not indexed, so inflation increases the portion of benefits subject to tax.

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