A single high-income year can lock in a higher Medicare Part B premium for the next year through the IRMAA surcharge
A retiree who sells a rental property, converts part of a traditional IRA to a Roth, or simply books one unusually large income year can end up paying a noticeably higher Medicare Part B premium — not that year, but the next one. The surcharge is called the income-related monthly adjustment amount, or IRMAA, and…