Health Savings Accounts (HSAs): The Most Tax-Advantaged Account Most People Ignore

A Health Savings Account (HSA) is a tax-advantaged account used to pay qualified medical expenses. On paper, it is designed for healthcare costs. In practice, for eligible savers who can afford to pay medical bills out of pocket and let the HSA grow, it is one of the most powerful long-term savings accounts available anywhere in the US tax code.

Verify current-year contribution limits, eligibility rules, and qualified-expense definitions at irs.gov before making decisions.

Eligibility: the HDHP requirement

To contribute to an HSA, you must be enrolled in an HSA-eligible high-deductible health plan (HDHP) and cannot be covered by other disqualifying insurance (including most FSAs, Medicare, or being claimed as a dependent). The IRS defines the minimum deductible and maximum out-of-pocket limits for HDHPs annually. If you are not on an HDHP, you cannot contribute this year — but if you have existing HSA funds, you can still use them.

The triple tax advantage

Three tax breaks apply simultaneously. First, contributions are pre-tax (either deducted from payroll or claimed as an above-the-line deduction on your tax return). Second, growth inside the account is tax-free — no annual tax on interest, dividends, or capital gains. Third, qualified withdrawals for medical expenses are tax-free.

No other common US tax-advantaged account offers all three. A Traditional IRA delays tax; a Roth IRA skips it on the back end; only an HSA does both.

Contribution limits

The IRS sets annual HSA contribution limits and adjusts them for inflation. Recent years have seen limits in the low-$4,000 range for self-only HDHP coverage and mid-$8,000 range for family coverage, with an additional $1,000 catch-up contribution allowed at age 55 or older. Employers can also contribute; the total from all sources cannot exceed the annual limit. Confirm current-year figures at irs.gov before contributing.

The long-game strategy

The highest-value HSA strategy for eligible savers is to contribute the maximum every year, pay current medical expenses out of pocket from other funds, and invest the HSA balance for long-term growth. Save every receipt for qualified medical expenses along the way — even decades later, you can reimburse yourself tax-free from the HSA for those old expenses. This effectively turns the HSA into a retirement account with tax-free withdrawals for anyone who has accumulated medical receipts.

Even if you never accumulate receipts, an HSA becomes similar to a Traditional IRA at age 65 — withdrawals for any purpose are allowed and taxed as ordinary income, with no penalty. Combined with tax-free medical withdrawals at any age, that flexibility is unusual.

What counts as a qualified medical expense

The IRS maintains a broad list of qualified expenses that includes most doctor visits, prescriptions, dental and vision care, mental health services, and many medical supplies. Publication 502 is the authoritative reference; consult it before assuming a specific expense qualifies.

Where to open an HSA

You can open an HSA at any HSA custodian, not just the one your employer uses for payroll contributions. If your employer's HSA has limited investment options or high fees, you can periodically transfer the balance to a better custodian. Look for low or no monthly fees and access to low-cost index funds inside the account.