Your IRMAA Notice Letter, Explained

When the letter arrives

Most people receive their IRMAA decision late in the year, before the new premium year starts, often around the same time as the annual letter about their Social Security cost-of-living adjustment. New enrollees get one when they sign up for Medicare. You also get a new notice whenever Social Security changes its decision, for example after approving a Form SSA-44 request. The letter is titled along the lines of "Notice of Medicare Income-Related Monthly Adjustment Amount."

Read it as soon as it arrives. The 60-day clock for an appeal starts when you receive it.

Section by section

The exact layout varies, but the notice usually contains the same parts. Here is what each one means and what to check.

Anatomy of an IRMAA initial determination
Section	What it says	What to check
The decision	That you must pay an income-related monthly adjustment amount for the year, and the amounts for Part B and Part D	That the premium year is the one you expect
Information used	The tax year, your filing status and the MAGI the IRS reported	Compare with line 11 plus line 2a of that year's Form 1040, and the filing status on it
How we figured it	The income range of your tier and the amounts that apply to it	Use the 2026 brackets to confirm the tier
If your income has gone down	That you can ask for a new decision if a life-changing event reduced your income	Whether one of the eight SSA-44 events applies to you
If you disagree	Your right to appeal, the 60-day deadline and how to request a reconsideration	Whether the tax information itself is wrong or outdated
How you will pay	Whether the amount is deducted from your benefits or billed	That your bank or payment details are up to date if you are billed

Checking the numbers

The most important line is the MAGI and the tax year. Take out your return for that year and add two figures: adjusted gross income from line 11 and tax-exempt interest from line 2a. They should match the notice. Also check the filing status. If the letter treats you as single when you filed jointly, or uses a year older than two years back, something is off.

A worked example

Barbara's notice for 2026 shows tax year 2024, filing status single and MAGI of $140,000. That is tier two: $405.80 a month for Part B and $37.50 for Part D, or $5,319.60 for the year. But Barbara married in 2024 and filed a joint return showing $140,000 of combined MAGI. On the joint table that is the standard tier, $202.90 a month. The letter used the wrong filing status, which is an error in the information, so she requests a reconsideration with a copy of the joint return. If it is corrected, the overcharge of $2,884.80 for the year is credited back.

Your options, in order

The numbers are right and nothing changed. The decision stands for that year. Use the IRMAA calculator to plan the next one.
The numbers are right, but your income has dropped since then because of a life-changing event. File Form SSA-44 to have Social Security use a more recent year. The appeal checklist lists the events and documents.
The numbers are wrong or outdated. Ask for a reconsideration within 60 days, or send the correct or newer return and ask for a new decision.
The income came from a one-time choice, such as a Roth conversion or a home sale. There is no appeal for this. Budget for the year and plan ahead.

Keep the letter

File the notice with your tax records. If you later amend your return, retire, or need to prove what you paid, it shows exactly what Social Security used. It also helps your tax preparer; Medicare premiums, including IRMAA, can count as medical expenses if you itemize deductions, though that does not change MAGI.

Check whether your notice qualifies for Form SSA-44 in two questions.

Open the appeal checklist

Frequently asked questions

Why did I get an IRMAA letter this year when I did not before?

Usually because your income two years ago was higher, for example from a Roth conversion, a home sale, a final working year or larger IRA withdrawals.

How long do I have to appeal?

For a reconsideration, 60 days from when you receive the notice. A Form SSA-44 request for a life-changing event does not have that limit.

The letter used my income from three years ago. Is that allowed?

Yes, if your two-years-back return was not available. Once it is processed, Social Security should update the decision; you can send a copy to speed it up.

Can I deduct IRMAA on my taxes?

Medicare premiums, including IRMAA, can count as medical expenses if you itemize, but that deduction does not lower MAGI.

Your IRMAA notice letter, explained