How your income at 63–64 sets your Medicare Part B and Part D IRMAA premiums at 65
A detailed explainer shows that the tax return from two years prior (often ages 63–64) determines Medicare Part B and Part D income-related surcharges (IRMAA) at 65, with 2026 brackets starting at $109,000 MAGI for singles and scaling premiums from $202.90 to $689.90 per month.
Source: Yahoo Finance ·
Grace's Take
Your income at 63–64 can quietly lock in Medicare surcharges that stick with you for years, potentially costing thousands in unexpected premiums. If you're planning a major Roth conversion or liquidating investments before claiming Social Security, that spike in taxable income two years earlier could push your Medicare Part B and Part D costs from $202.90 to $689.90 monthly—a meaningful jump that many don't anticipate when timing their retirement moves. Worth running the numbers on whether any planned early-60s income events (conversions, withdrawals, capital gains) could cross into higher IRMAA brackets before your 65th birthday.
- •Medicare uses the **most recent tax return on file (typically 2 years prior)** to set IRMAA surcharges for Part B and Part D at age 65.
- •In 2026, single filers with **MAGI at or below $109,000** pay the standard **$202.90** Part B premium, with step-up brackets reaching **$689.90** at the top tier.
- •Roth conversions, capital gains, or large retirement account withdrawals in your early 60s can unintentionally push income into higher IRMAA brackets.
Those 6–15 years from retirement should time Roth conversions and large withdrawals carefully, using their early 60s as a strategic “tax window” to manage IRMAA exposure and control future Medicare costs.