IRMAA stands for the Income-Related Monthly Adjustment Amounts. IRMAA can apply to Medicare Part B (medical insurance) and Medicare Part D (prescription drug coverage).

The IRMAA amounts may apply if your income is higher than a certain level. The government looks at your income as reported on your taxes two years ago.

How much are the IRMAA amounts for Part D and Part B?

This table lays out how much the IRMAA adjustments are for Medicare Part D and Part B as of 2019. It’s based on your 2017 income taxes. The government looks at your modified adjusted gross income from two years before the current year.

Modified adjusted gross income/ tax filing category    
Individual Married, filing jointly Married, filing separately Your monthly Medicare Part B premium may be The amount added to your monthly Medicare Part D premium may be
$85,000 or less $170,000 or less $85,000 or less $135.50 $0
$85,001 – $107,000 $170,001 – $214,000 N/A $189.60 $12.40
$107,001 -$133,500 $214,001 – $267,000 N/A $270.90


$133,501 – $160,000 $267,001 – $320,000 N/A $352.20 $51.40
$160,001 to less than $500,000 $320,001 to less than $750,000 $85,001 to less than $415,000 $433.40 $70.90
$500,000 or above $750,000 and above $415,000 and above $460.50 $77.40


How will I know if I have to pay an IRMAA adjustment for Part D and Part B?

If you’re required to pay an IRMAA amount, you’ll get a notice from Social Security. The notice is called an “initial IRMAA determination.”

Generally, you don’t have to do anything, although it would be a good idea to review the notice to make sure it’s correct and keep it for your records. For most people, the Medicare Part B IRMAA amount is added to your premium and automatically deducted from their Social Security benefits. The Medicare Part D IRMAA, if it applies to you, will be added to your Part D premium.

If your income level drops, you can file an appeal with Social Security. The instructions for filing an appeal are on your IRMAA determination letter.

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