A 60-year-old couple can convert $178,000 from a traditional 401(k) to a Roth IRA in 2026, paying $39,200 in taxes now to save over $100,000 later. Stacked RMDs, Social Security taxation, and Medicare IRMAA surcharges push the effective marginal rate to roughly 40%, making today's 22% bracket conversions a clear advantage. SECURE 2.0 now forces workers earning over $150,000 to direct catch-up contributions into a Roth 401(k), strengthening the case to also convert existing traditional balances.
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Advisor.com's free matching tool pairs you with vetted fiduciaries from major national firms, all in under three minutes. See who you match with today. A 60-year-old couple sitting on $1.5 million in a traditional 401(k) faces a question with a real number attached.
Do you pay roughly $39,200 in voluntary tax in 2026 to avoid an estimated $100,000 in lifetime tax later? The answer for most readers in this band is yes, and the reason rests on bracket mechanics you can see today. You retire at 65, defer Social Security to 70, and let RMDs hit at 75.
Between 60 and 65 sits a five-year window where you control your taxable income almost completely. That window is the most valuable tax-planning real estate most Americans will ever own, and it closes quietly. For 2026, the 22% bracket for married filing jointly runs from $100,800 to $211,400, and the standard deduction is $32,200.
A retired couple with modest interest income and no wages can convert about $178,000 from a traditional 401(k) to a Roth IRA and stop precisely at the top of the 22% bracket. The federal tax bill on that conversion lands near $39,200, paid from a taxable brokerage account so the full conversion lands in the Roth. The savings show up in three places that compound on each other.
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