What IRMAA means
IRMAA is an additional Medicare premium amount for some higher-income beneficiaries. It can apply to Part B and to Part D, even if the person's drug coverage is inside a Medicare Advantage plan.
How Social Security decides
Social Security explains that Medicare premiums can be higher for people with higher income. The determination generally uses tax information from the IRS, often from two years before the premium year.
Part B and Part D are handled differently
For Part B, IRMAA is added to the Part B premium. For Part D, the person may pay the plan premium to the insurance company and the IRMAA amount separately through Medicare or Social Security.
Life-changing events
Social Security allows people to request a lower IRMAA when income has gone down because of certain life-changing events, such as work stoppage, work reduction, marriage, divorce, death of a spouse, or loss of income-producing property.
IRMAA is not a plan penalty
IRMAA is not caused by picking the wrong Medicare plan. It is an income-related premium adjustment. Changing insurance companies does not by itself remove IRMAA.
Why it belongs in the Medicare budget
People comparing coverage should include IRMAA when estimating total Medicare costs. It can affect the true monthly budget alongside Part B, Part D, Medigap, Medicare Advantage, prescriptions, and out-of-pocket exposure.