Fidelity warns Roth IRA conversions can backfire

Retirees often weigh the benefits of a Roth IRA conversion to minimize future tax liabilities. Moving traditional IRA assets into a Roth account requires paying income taxes on the converted amount during the year of the transfer. This transaction generates taxable income that shows up on your tax return.

Many individuals overlook how this extra income influences their Medicare costs. Social Security and Medicare adjust premiums based on modified adjusted gross income reported two years prior. A large Roth conversion creates a spike in your income level. This spike triggers the Income Related Monthly Adjustment Amount, also known as IRMAA.

IRMAA acts as a surcharge on top of standard Part B and Part D premiums. Once your income crosses specific thresholds, these additional costs apply automatically. These premiums remain in effect for the entire calendar year regardless of whether your income drops back down later.

Financial planning requires looking past the immediate tax bill of a conversion. You must account for potential increases in your health care premiums. Calculating the conversion amount against the resulting IRMAA bracket helps determine if the long term tax benefits outweigh the short term cost of higher Medicare premiums.