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How Roth Conversions Affect ACA Premium Tax Credits
For clients retiring before Medicare, health insurance may be purchased through an ACA marketplace. A Roth conversion can raise household income and reduce the premium tax credit that lowers monthly insurance premiums.
The Rule
Premium credits compare benchmark premium to expected contribution
The premium tax credit is generally based on household income, household size, and the cost of the benchmark plan, often described as the second-lowest-cost silver plan available to the household. If income rises, the expected household contribution can rise, reducing the credit.
| Input | Why it matters |
|---|---|
| Household income | Determines expected contribution and whether the household qualifies for a credit. |
| Household size | Determines the federal poverty level percentage used in the calculation. |
| Benchmark premium | The credit generally fills the gap between benchmark premium and expected contribution. |
| Age and location | Premiums vary substantially by age, county, and available plans. |
Why Roth Conversions Matter
The conversion may create a hidden health insurance cost
A Roth conversion creates taxable income. For a pre-Medicare retiree using marketplace coverage, that extra income may reduce the premium tax credit. The real cost of the conversion can therefore include federal tax, state tax, and lost health insurance subsidy.
The planning opportunity: coordinate Roth conversions around Medicare start age, marketplace subsidy years, and lower-income years before required minimum distributions begin.
Example
$90,000 conversion before Medicare
Assume a two-person household has $100,000 of income and a $24,000 annual benchmark premium. A $90,000 conversion increases household income to $190,000. Even if the tax bracket looks acceptable, the premium tax credit may fall sharply, increasing net health insurance premiums. That lost credit should be viewed as part of the conversion cost.
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