The Roth Conversion That Cost a 62-Year-Old His $9,600 Health Insurance Subsidy

A $40,000 Roth conversion pushed a 62-year-old retiree past the 400% federal poverty line, eliminating his entire $9,600 ACA premium tax credit.

The ACA subsidy cliff returned January 1, 2026, after enhanced protections expired and multiple legislative extensions failed to pass Congress.

The true marginal cost of the conversion reached roughly 36%, since the $9,600 clawback added a stealth 24% surcharge on top of ordinary income tax.

Picture a 62-year-old who retired at 60, lives on roughly $58,000 a year drawn from a taxable brokerage account, and buys his health insurance on the ACA marketplace. In late December, a headline about tax-bracket management convinces him to convert $40,000 from his traditional IRA to a Roth. His logic seems airtight. He is in a low bracket, and future required minimum distributions look ugly.

Then his January premium notice arrives and his entire $9,600 premium tax credit has vanished. This is one of the most expensive errors in early retirement right now. It is happening because the enhanced ACA subsidies expired January 1, 2026.

From 2021 through 2025, the American Rescue Plan smoothed the ACA subsidy curve so that going one dollar over 400% of the federal poverty line no longer detonated the entire credit. Congress let the plan expire, and subsidies reverted to pre-ARPA rules.

That means the old cliff is back. Cross 400% FPL by a single dollar and the entire premium tax credit is clawed back on the tax return. Average net marketplace premium payments more than doubled, and the Urban Institute estimated 4.8 million more people went uninsured in 2026.

Where The $40,000 Conversion Actually Landed

The retiree's taxable-account spending is mostly return of basis and qualified dividends, so his modified adjusted gross income was comfortably under the cliff before December. Adding a $40,000 conversion to MAGI pushed him past 400% FPL. Every dollar of that conversion is ordinary income.

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Run the layers using verified 2026 figures. The single-filer standard deduction is $16,100. The 12% bracket runs to $50,400, and 22% begins above that. On paper the conversion looks like it lives mostly in the 12% bracket.