NHeLP’s MAGI Guide has been a leading resource on Modified Adjusted Gross Income methodologies used to determine financial eligibility for multiple insurance affordability programs, including most Medicaid categories, the Children’s Health Insurance Program (CHIP), as well as Premium Tax Credits and Cost Sharing Reductions for health plans purchased through the Affordable Care Act (ACA) Marketplaces. This August 2018 update addresses changes to MAGI under the Republican tax plan enacted last year, as well as recently passed legislation affecting MAGI-based calculations.