What counts in MAGI for IRMAA
By Elder PaperworkUpdated
Short answer
For IRMAA, MAGI is your adjusted gross income plus your tax-exempt interest.
On Form 1040, that is line 11 plus line 2a.
For 2026, Social Security generally uses your 2024 return.
Sources: Form SSA-44 (12-2025); Social Security, Medicare premiums. Read November 4, 2026.
Key facts
How is MAGI calculated for IRMAA?
MAGI = adjusted gross income (Form 1040, line 11) + tax-exempt interest (Form 1040, line 2a).
Form SSA-44 gives these exact lines.
Can you show an example?
AGI of $120,000 plus $5,000 of tax-exempt interest gives a MAGI of $125,000.
Single filer in 2026: that’s the second bracket, $284.10 for Part B plus $14.50 for Part D.
Which tax return does Social Security use?
For 2026, generally the 2024 return filed in 2025. Sometimes the 2023 return.
Check it with the lookback year tool.
Check your case before you send anything.
Check my savingsWhat if the MAGI on my letter is wrong?
If the IRS figure is wrong, Social Security says to correct it with the IRS.
If you amended your return, send it with the IRS receipt.
Questions
Is MAGI the same as taxable income?
No. For IRMAA, it is AGI (line 11) plus tax-exempt interest (line 2a).
Does tax-exempt interest count?
Yes. It is added to your adjusted gross income.
Where do I find my AGI?
On line 11 of your Form 1040.