What is HSA (Health Savings Account)?

An HSA (Health Savings Account) is a triple-tax-advantaged account for people enrolled in a high-deductible health plan (HDHP). Contributions go in tax-free, the balance grows tax-free, and withdrawals for qualified medical expenses come out tax-free — no other account type offers all three, most retirement and savings vehicles give you one or two of those breaks, never the full set.

Unlike an FSA, HSA funds never expire and the account belongs to you even if you change jobs or health plans. It's also different from a 401(k) or IRA: those only give you one or two of the three tax benefits, not all three at once, which is why financial advisors often call the HSA the most efficient account available for eligible individuals.

If you're 55 or older, you can add a $1,000 catch-up contribution on top of either limit. One detail people frequently overlook: these limits include employer contributions and any employer match — not just what you personally deposit. If your employer puts in $1,000, your own contribution room drops by that same amount.

The two accounts get confused constantly, and for good reason: both let you set aside pre-tax money for medical costs. The difference is portability. An FSA is tied to your employer and typically has a "use it or lose it" rule each year, while an HSA rolls over indefinitely and stays with you.

Generally, you can't contribute to both a standard health FSA and an HSA in the same year — enrolling in one usually disqualifies you from the other. The one exception is a limited-purpose FSA, which only covers dental and vision costs and can be paired with an HSA.

Per IRS Publication 502, qualified expenses cover a wide range of medical, dental, and vision costs:

• Doctor, dentist, and specialist visits
• Prescription medications
• Vision care, including glasses and contacts
• Certain over-the-counter medications and supplies
• Physical therapy and chiropractic care

A common point of confusion: gym memberships generally do not qualify on their own. They can only be reimbursed if a doctor prescribes the membership to treat a specific diagnosed condition, with documentation on file — a general wellness membership doesn't count.

HSA vs 401(k) vs IRA

The HSA often gets overlooked next to retirement accounts, but it's worth comparing side by side since each type handles taxes differently.

• 401(k) — Contributions reduce taxable income now, but withdrawals in retirement are taxed as ordinary income. One tax break, deferred to later.
• Traditional IRA — Works the same way as a 401(k) tax-wise: deduct now, pay tax on withdrawals later. Contribution limits are lower and income limits can restrict deductibility.
• Roth IRA — The opposite structure: no upfront deduction, but qualified withdrawals in retirement are completely tax-free. One tax break, received upfront in the form of tax-free growth.
• HSA — Combines both approaches. Contributions are deductible now, growth is tax-free, and withdrawals for medical expenses are also tax-free. After 65, non-medical withdrawals are taxed like a traditional IRA, so you don't lose flexibility even if you don't need the money for medical costs.

Because of this, many financial planners suggest treating an HSA as a stealth retirement account: pay medical expenses out of pocket when you can afford to, let the HSA balance invest and grow untouched, and save your receipts. There's no deadline on reimbursing yourself for a qualified expense — you can pay a medical bill in your 30s and reimburse yourself from HSA funds decades later, tax-free, after the account has had years to grow. This strategy works especially well if you can afford to pay medical bills from a regular savings account today, treating the HSA purely as a long-term investment vehicle instead of a spending account.

Turning 65 changes what you can do with HSA funds. The 20% penalty for non-medical withdrawals disappears entirely — after 65, you can withdraw for any purpose. Withdrawals for qualified medical expenses stay completely tax-free, exactly as before.

Withdrawals for non-medical reasons after 65 are taxed as ordinary income, similar to how a traditional IRA works. This makes an HSA function as a backup retirement account once you no longer need to worry about medical-only withdrawal rules.