KEY POINTS
  • About 7% of Medicare's 63.3 million beneficiaries end up paying extra for premiums because their income is high enough for "income-related monthly adjustment amounts," or IRMAAs, to kick in.
  • You can appeal those surcharges, although you generally have to wait until you receive a determination from the Social Security Administration.
  • If the agency approves, any IRMAAs you paid would be credited to your bill.

If you're retiring and signing up for Medicare, there's a chance you'll be assessed extra monthly charges — at least at first.

While most enrollees pay the standard premium amounts for Part B (outpatient care) and Part D (prescription drugs), about 7% of Medicare's 63.3 million beneficiaries end up paying extra because their income is high enough for "income-related monthly adjustment amounts," or IRMAAs, to kick in.