HSA Day is observed annually on October 15 in the United States, aiming to raise awareness about the importance of health savings accounts (HSAs). HSAs are medical savings accounts that allow individuals to save money for healthcare expenses, with the funds being controlled and monitored by the individual rather than an insurance company or employer. While employers may contribute to these accounts, the money remains the individual's property even if they change jobs. HSAs offer tax advantages, as contributions are not taxable when withdrawn for eligible expenses, and unused balances can roll over to the next year. To qualify for an HSA, individuals must be under 65 and have a high-deductible insurance plan. The day typically involves educational activities to inform the public about the benefits and functions of HSAs.