IRMAA Calculator: the facts

1. The 2026 Medicare premium is set by income from the 2024 tax return, two years back. The standard Part B premium is $202.90 a month; the income-related surcharges begin above $109,000 of modified adjusted gross income on an individual return and $218,000 on a joint return.
2. One dollar over a threshold moves the whole premium up a step. At $109,001 of 2024 income, a single filer pays $284.10 for Part B plus a $14.50 Part D surcharge: $1,148.40 more for the year than a neighbor one dollar under.
3. There are six tiers. The first surcharge adds $81.20 a month to Part B and $14.50 to Part D; the top tier, at $500,000 and above on an individual return, adds $487.00 and $91.00, for a Part B premium of $689.90.
4. A married couple filing jointly at $750,000 of income pays $1,379.80 a month for two Part B premiums, before Part D.
5. The surcharge is not a marginal tax. It applies to the whole premium, so the cost of crossing a threshold is the same whether you cross it by one dollar or by ten thousand.
6. If income has dropped since the 2024 return because of retirement, a death, a divorce, or another listed life-changing event, Social Security will use the more recent year on request (Form SSA-44).

Educational only, not investment, tax, or legal advice. Results are hypothetical estimates that vary with each use and over time and are not guaranteed accurate or complete. Using this tool creates no client relationship with Considerate Capital, and the site that linked here is not affiliated with it. By using it you agree to the tool terms (opens in a new window).