Impact of Roth IRA Conversion on Social Security Benefits and Medicare IRMAA

Key Takeaways

• Complete Roth conversions at least 2 years before Social Security claiming and Medicare enrollment to avoid IRMA penalties—income from 2 years prior determines your Part B and Part D premiums
• Roth distributions are truly tax-free and don't count as income for Social Security taxation or Medicare premium calculations, unlike other tax-free income sources like municipal bonds
• Spread large conversions (e.g., $200k/year for a $1.7M conversion) across multiple years to manage your tax bracket and avoid being pushed into a higher bracket in any single year
• Don't optimize for the lowest tax bill in one year—focus on minimizing your total lifetime tax bill across all years; overpaying today doesn't guarantee better long-term outcomes