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Modified Adjusted Gross Income (MAGI) is determined based on federal tax rules for how income is counted and family size is determined for Medicaid and CHIP eligibility. MAGI is NOT a number on a tax return. −Aligns eligibility rules for all insurance affordability programs (Medicaid, CHIP, advanced payments of premium tax credits/cost sharing reductions) Modified Adjusted Gross Income This manual explains how to determine Medicaid and CHIP eligibility using the MAGI-based methodology. Children Adult s ages 19-64 Parents and caretaker relatives Pregnan t women 5 Use MAGI to determine eligibility for the following eligibility groups: Comparing Results to Eligibility Levels Determining Household Income Constructing a Household Purpose