The honest answer to this question is that the figures do not exist yet, and any page showing them is showing a projection. The brackets for a given year are announced by CMS in the autumn before it, and until that announcement the only true statements are about the mechanism: what it reads, which year it reads, and what to do if the year it reads no longer describes your life.
What IRMAA is, and which year it reads
The income-related monthly adjustment amount is a surcharge added to the Part B premium, and to the Part D premium, for people above defined income thresholds. The income it reads is not the current year's: it is the modified adjusted gross income from a tax return two years earlier, which is the most recent return the Social Security Administration has on file when the determination is made. That two-year lag is the single most surprising feature of the rule.
Why this page shows no numbers
The brackets are set annually and announced with the following year's premiums, normally in the autumn. Until then there is no published figure for 2027, and this site does not estimate: the rule everywhere here is that a figure comes from the page that published it or it does not appear. For reference, the base the surcharge is added to is published: the standard Part B premium is $202.90 each month in 2026, before any adjustment.
The part people can actually act on
Because the determination reads a two-year-old return, a person whose income has since fallen for a defined reason may ask for it to be redetermined rather than waiting two years for the figure to catch up. Retirement, the loss of a job, and the death of a spouse are among the recognised events. Social Security publishes the form and the process, and the State Health Insurance Assistance Program will help with it, free.
Questions people ask about 2027 irmaa brackets
When are the 2027 brackets published?
With the 2027 premium announcement, normally in the autumn of 2026. Until then no published figure exists.
Which year's income is used?
The modified adjusted gross income on the tax return from two years earlier, which is the most recent one on file when the determination is made.
My income dropped. Do I have to wait two years?
Not necessarily. Social Security allows a redetermination after defined life-changing events, and publishes the form for it.
Why does this page not estimate the brackets?
Because an estimate is not a published figure. Everything on this site comes from the page or the file that published it, or it is not here.