CALCULATION OF MAGI FOR IRMAA IN 2024 IS NOT RIGHT

tizzy2335 · ‎November 30, 2025

I have searched extensively on the internet for the correct answer to this question and what I find is contrary to the way my MAGI was used to calculate IRMAA in 2024.

The charitable contribution deduction should not be added back in this specific calculation. Therefore, an itemized charitable deduction reduces the MAGI used to determine eligibility and the amount of the IRMAA. Lowering this MAGI can significantly decrease the IRMAA amount, making itemized giving a powerful tool for managing healthcare costs, i.e. Medicare premium bracets.

Please advise where I should go for clarification. Thanks.

VolvoGirl

Maybe some of this will help figure it out. 10/22/25 See this post for the 2025 IRMAA and the brackets

https://ttlc.intuit.com/community/file-with-turbotax/discussion/can-you-give-info-on-projected-irmaa...

Yes they look back a couple years to figure the IRMAA for the next year.

https://secure.ssa.gov/apps10/poms.nsf/lnx/0601101031

IRMAA uses your AGI plus tax exempt interest on 1040 line 2a.

SSA - POMS: HI 01101.010 - Modified Adjusted Gross Income (MAGI) - 01/05/2024

rjs

MAGI for IRMAA is simply Adjusted Gross Income (AGI) plus tax-exempt interest. Itemized deductions, including charitable contributions, have nothing to do with it. They do not affect your AGI.

But keep in mind that your IRMAA is based on your MAGI from two, or possibly three, years ago. For example, your IRMAA for 2026 will usually be based on your 2024 tax return, or possibly your 2023 tax return.

On tax returns for 2020 through 2024 the MAGI for IRMAA is Form 1040 line 11 plus line 2a.

Also, in searching the internet keep in mind that there are different definitions of MAGI, depending on what it's being used for. You have to look at the definition that is specifically for IRMAA. MAGI for other purposes would be calculated differently.