IRMAA stands for income-related monthly adjustment amount and is an additional amount that some people might have to pay along with their Medicare premium.
If you are making less than $87,000 a year as an individual or you are making a combined less than $174,000 as a couple, you earnings are below the IRMAA line and you’ll pay a $144.60 monthly premium for Part B. If your income exceeds these numbers, you will pay an additional amount each month depending on how much you earn. For example, the next tier up pays $202.40 per month; this is nearly a $60 increase in monthly premiums.
Even though your additional income results in a more expensive Medicare Product, the high earners should still join Original Medicare. Medicare offers the highest quality plans at a very inexpensive cost.