What is the ruling on Health savings account (HSA)?

Health savings account (HSA) is a tax-advantaged medical saving account available to taxpayers in United States who are enrolled in a high-deductible health plan. The funds contributed to an account are not subject to federal income tax at the time of deposit. HSAs are owned by the individual and its funds roll over and accumulate year to year if they are not spent.

As of the ruling of Muslims participating in it, it is permissible in order to procure the benefits granted to its participants. However, Muslims should stay away from any usurious earnings, whether by avoidance, which is preferable, or riddance, in case their investments were tainted by them.