A health savings account is one of the most underused financial accounts available. It gives you a triple tax benefit that no other account offers: contributions are tax-deductible, growth is tax-free, and withdrawals for medical expenses are tax-free. Here is how it works and when it makes sense.
What Is an HSA?
An HSA is a tax-advantaged savings account specifically for medical expenses. To open one, you must be enrolled in a high-deductible health plan. You contribute money, it grows, and you can withdraw it tax-free for qualified medical costs anytime.
Unlike a flexible spending account, HSA money does not expire. Every dollar you do not spend rolls over to the next year indefinitely. This is the key feature that makes HSAs such a powerful long-term savings tool.
The Triple Tax Advantage
HSAs are the only account in the tax code with three separate tax benefits:
- Contributions are tax-deductible: Money you put in reduces your taxable income, similar to a traditional IRA or 401(k) contribution.
- Growth is tax-free: Interest and investment gains accumulate without being taxed.
- Withdrawals are tax-free: When used for qualified medical expenses, you pay no taxes on withdrawals, unlike a traditional IRA or 401(k) where you pay taxes on distributions.
No other account offers all three of these at once. A Roth IRA gives you two. A traditional IRA gives you two. An HSA gives you all three.
HSA Contribution Limits for 2026
The IRS sets annual contribution limits for HSAs:
- Self-only coverage: $4,300
- Family coverage: $8,550
- Catch-up contributions (age 55+): An additional $1,000 per year
These limits include both your contributions and any employer contributions. If your employer puts $500 into your HSA, that counts toward the limit.
Who Qualifies for an HSA?
To be eligible to contribute to an HSA, you must:
- Be enrolled in a qualified high-deductible health plan
- Not be enrolled in Medicare
- Not be claimed as a dependent on someone else’s tax return
- Not have any other non-HDHP health coverage
For 2026, a plan qualifies as a high-deductible health plan if the deductible is at least $1,650 for self-only coverage or $3,300 for family coverage.
What Expenses Qualify for Tax-Free Withdrawal?
Qualified medical expenses include almost everything health-related:
- Doctor visits, copays, and coinsurance
- Prescription medications
- Dental care, including braces and other orthodontic treatment
- Vision care, including glasses and contact lenses
- Mental health care and therapy
- Chiropractic care
- Acupuncture
- Over-the-counter medications (expanded under the CARES Act)
- Menstrual care products
- Long-term care insurance premiums (with limits)
- COBRA premiums when unemployed
- Medicare premiums after age 65
What About Non-Medical Withdrawals?
If you withdraw HSA funds for non-medical expenses before age 65, you owe income tax plus a 20% penalty. After age 65, the penalty goes away. You still owe income tax on non-medical withdrawals, but no penalty. At that point, an HSA functions exactly like a traditional IRA for non-medical expenses.
This means an HSA effectively becomes a bonus retirement account at 65, in addition to its value as a medical savings vehicle throughout your life.
How to Invest Your HSA
Many people make the mistake of leaving HSA money in a low-yield cash account. Once your balance exceeds a threshold (often $1,000 to $2,000), many HSA providers let you invest in mutual funds and ETFs, similar to a 401(k).
If your goal is to build long-term medical savings, invest the HSA in low-cost index funds and let it grow for decades. Some people pay all current medical expenses out of pocket and save receipts, then reimburse themselves years later from the grown HSA balance. There is no time limit on reimbursements, as long as the expense occurred after the HSA was opened.
Which HSA Provider Should You Use?
If your employer offers an HSA and contributes to it, start there. The employer contribution is free money. However, you are not required to use your employer’s HSA provider.
Fidelity offers one of the best HSAs available: no account fees, no minimum balance requirements for investing, and access to thousands of low-cost funds. It consistently ranks as the top HSA for investment purposes.
Other strong options include Lively and HealthEquity. Avoid HSA providers that charge high monthly fees or have limited investment options.
The HDHP Trade-Off
To use an HSA, you have to be on a high-deductible health plan. These plans have lower premiums but higher deductibles. Whether this trade-off makes sense depends on your health situation.
If you are young and healthy and rarely use medical care, the lower premium and HSA contribution often beats a traditional low-deductible plan. Run the numbers: add up the lower premium savings over a year. Compare that to the higher deductible you would face in a bad year. The premium savings plus the HSA tax benefit often wins for healthy individuals.
If you have chronic conditions, regular prescriptions, or expect significant medical expenses, a lower-deductible plan with higher premiums may be more cost-effective.
Should You Open an HSA?
If you are on an eligible HDHP and are not on Medicare, yes. At minimum, contribute enough to capture any employer match. Then, if your cash flow allows, contribute the maximum and invest the balance. The long-term tax savings are significant, especially if you stay healthy for many years and let the account compound.
An HSA is not a substitute for an emergency fund. Keep three to six months of expenses in a liquid savings account before maximizing the HSA.