The Health Savings Account (HSA) is one of the few investment options that provides a three-fold tax benefit: contributions to an HSA are tax-deductible thereby reducing your income tax, earnings on the HSA account continue to grow tax-deferred, and all contributions and earnings in HSAs become tax-exempt if used for qualified medical expenses such as outpatient services, prescription drugs, etc. Use this calculator to estimate how much your HSA plan savings may grow to in the future.