The Social Security Administration (SSA) uses the tax return to determine your modified adjusted gross income (MAGI) to determine if your income-related monthly adjusted amount (IRMAA) is applicable.
The SSA will add your tax exempt interest and any nontaxable portion of your social security income and a few other types of income to determine if you fall into the IRMAA. They use your tax return from the IRS when making their decision. TurboTax does not necessarily compute this specific formula since it is not the same as MAGI needed for various income tax scenarios based on the specific sections of tax law.
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