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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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