Retirees With Over $800,000 in a Traditional 401(k) Are Being Warned About This Social Security Clawback

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David Beren

Mon, April 13, 2026 astatine 8:39 AM CDT 5 min read

Required minimum distributions (RMDs) astatine property 75 harvester with Social Security to propulsion provisional income into zones wherever up to 85% of benefits go taxable, and Medicare IRMAA surcharges (ranging from $90 to $500+ monthly) are triggered by modified adjusted gross income supra $109,000 successful a two-year lookback, compressing the existent after-tax worth of Social Security by 20% to 30%.
Executing Roth conversions during the spread years betwixt status (age 63) and RMD commencement (age 73-75) astatine little marginal taxation rates tin substantially trim the accepted equilibrium and little aboriginal RMDs, Social Security taxation, and IRMAA exposure, though the IRMAA two-year lookback creates a applicable ceiling of staying nether $109,000 successful modified adjusted gross income each year.
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A accepted 401(k) equilibrium of $800,000 looks similar a status occurrence story, and astatine property 75, with Social Security coming successful and the portfolio inactive intact, the numbers look manageable. The IRS and Medicare are already coordinating to taxation a ample stock of it, including income the holder has not yet touched.

The mechanics starts with required minimum distributions. A retiree with $800,000 successful a accepted 401(k) taking RMDs of $35,000 per twelvemonth astatine property 75 indispensable adhd that withdrawal to different income erstwhile calculating what the IRS calls provisional income. Add Social Security income of $28,000, and provisional income reaches astir $49,000, which is good into the 85% Social Security taxability zone.

That means up to 85% of Social Security benefits are counted arsenic mean taxable income. On $28,000 successful benefits, astir $23,800 becomes taxable. Combined with a $35,000 RMD, the retiree reports taxable income of adjacent to $59,000 earlier accounting for different sources. The Social Security payment has not been reduced successful the account, but its existent after-tax worth has been softly compressed.

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The 2nd furniture arrives from Medicare. IRMAA surcharges are triggered supra $109,000 successful modified adjusted gross income, and the lookback regularisation makes them particularly hard to avoid: Medicare uses income from 2 years anterior to acceptable premiums. A retiree who crosses that threshold successful 2026 faces surcharges successful 2028, careless of what income looks similar then. The combined taxation and premium interaction tin trim the existent worth of Social Security by 20% to 30%.

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