Here’s some info on the IRMMA
Your IRMAA is based on your MAGI from two or three years ago. For example, your IRMAA for 2024 will usually be based on your 2022 tax return, or possibly your 2021 tax return. On your 2021, 2022, or 2023 tax return, the MAGI for IRMAA is Form 1040 line 11 plus line 2a.
If your income changes use form SSA-44 to adjust the IRMAA
https://www.ssa.gov/forms/ssa-44.pdf
Found this on another post…..
https://ttlc.intuit.com/community/taxes/discussion/irmaa/00/3389032
How Social Security determines the IRMMA, See this answer…..
20 CFR § 418.1120 - How do we determine your income-related monthly adjustment amount?
https://www.law.cornell.edu/cfr/text/20/418.1120
20 CFR § 418.1115 - What are the modified adjusted gross income ranges?
https://www.law.cornell.edu/cfr/text/20/418.1115
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