The main purpose of the Health Savings Account Expansion Act is to broaden the eligibility criteria for health savings accounts (HSAs) under the Internal Revenue Code. This legislation aims to make it easier for more individuals to access HSAs, which allow people to save money tax-free for medical expenses. Key provisions of the Act include several changes to the eligibility requirements for HSAs. It allows individuals covered by government health plans, such as Medicare or Medicaid, to qualify for HSAs.