HSA stands for Health Savings Account and is a savings account you can use to pay medical expenses with tax benefits. HSA's are more popular than ever. In fact, HSA assets reached nearly $66 billion in 2019, a 23 percent increase from the end of 2018. And the number of accounts grew 13 percent from the previous year, with over 28 million HSAs now open. Many employers that offer high-deductible health plans also offer HSAs and may even contribute to these accounts. But even if your employer does not, you can open one on your own as long as you have a qualifying health plan.