IRMAA isn't a penalty for a mistake, it's a surcharge based on income from two years ago. Enter your 2024 income to see your 2026 Part B and Part D cost.
| Single MAGI | Joint MAGI | Part B total | Part D surcharge |
|---|---|---|---|
| $109,000 or less | $218,000 or less | $202.90 | $0 |
| $109,001 – $137,000 | $218,001 – $274,000 | $284.10 | $14.50 |
| $137,001 – $171,000 | $274,001 – $342,000 | $405.90 | $37.30 |
| $171,001 – $205,000 | $342,001 – $410,000 | $527.70 | $60.10 |
| $205,001 – $500,000 | $410,001 – $750,000 | $649.50 | $82.90 |
| Over $500,000 | Over $750,000 | $689.90 | $91.00 |
IRMAA doesn't work like income tax brackets. Once your MAGI crosses a threshold, the full surcharge for that tier applies to your entire premium, not just the amount above the line. Someone at $137,001 pays the same surcharge as someone at $170,000, and someone at $136,999 pays a meaningfully lower one. One dollar can be the difference between tiers.
Your 2026 premium is based on your 2024 tax return, the most recent one the IRS has on file. This means income moves you make today, a Roth conversion, a large capital gain, selling a home, won't affect your premium until two years later. It also means a bad surprise now might reflect a year that no longer represents your actual finances.
If you've had a qualifying life-changing event, retirement, divorce, death of a spouse, loss of income, you can file Form SSA-44 to ask Social Security to use a more recent year instead of the two-year-old figure. This is genuinely underused. If your circumstances changed and this applies to you, it's worth filing rather than assuming the number above is final.
This estimates your bracket based on the figures above but doesn't calculate your MAGI for you, that requires your actual tax return. It also doesn't model Part D surcharges for immunosuppressive-drug-only coverage, which follow a separate schedule. Confirm your exact situation with the Social Security Administration or a tax professional before making income decisions based on this estimate.