A health savings account is meant for medical bills. You put money in, and you spend it on doctor visits, prescriptions, or a $900 dental crown. Plenty of people use it exactly that way, and that’s fine.
A smaller group does something else. They pay medical bills out of their regular checking account, leave the HSA invested for decades, and treat it as an extra retirement account. The reason is the tax treatment, which is better than a 401(k) or an IRA.
Three tax breaks in one account
Most retirement accounts give you a tax break once: either when the money goes in (traditional 401(k), traditional IRA) or when it comes out (Roth). An HSA can give you a break at all three stages:
- Going in. Contributions are deductible, or pre-tax if they come through payroll. Payroll contributions made through an employer’s cafeteria plan also skip Social Security and Medicare tax, which a 401(k) contribution does not.
- While it grows. Interest, dividends and gains inside the account are not taxed.
- Coming out. Withdrawals for qualified medical expenses are tax-free.
A couple of states, notably California and New Jersey, don’t follow the federal treatment for state income tax, so check your state.
Who can open one, and the 2026 numbers
You can contribute to an HSA only if you’re covered by a high-deductible health plan (HDHP) and don’t have other disqualifying coverage. You also can’t contribute once you’re enrolled in Medicare.
Under Revenue Procedure 2025-19, the IRS set these figures for 2026:
- Contribution limit: $4,400 for self-only coverage, $8,750 for family coverage.
- An extra $1,000 catch-up if you’re 55 or older.
- To count as an HDHP, the plan’s deductible must be at least $1,700 (self-only) or $3,400 (family).
- The plan’s out-of-pocket maximum can’t be more than $8,500 (self-only) or $17,000 (family).
Employer contributions count toward the limit. If your employer puts in $1,000 and you have self-only coverage, you can add $3,400 yourself in 2026.
Why the receipt trick matters
There’s no deadline for reimbursing yourself. If you have a $1,200 urgent care bill in 2026 and pay it from your checking account, you can withdraw $1,200 from your HSA tax-free in 2036, or 2046. The expense just has to have happened after you opened the HSA, and you need records to show it was a qualified expense that you didn’t already deduct or get reimbursed for.
This is what makes the “invest it and leave it” approach work. You keep receipts in a folder, or a scanned folder in cloud storage, and let the money compound. Years later, the pile of old receipts works like a tax-free withdrawal allowance you can draw on whenever you want.
What happens at 65
Before 65, spending HSA money on anything other than qualified medical costs means paying income tax on it plus a 20% penalty. That’s steep.
After 65, the penalty goes away. Non-medical withdrawals are taxed as ordinary income, the same as a traditional IRA. Medical withdrawals stay tax-free. So in the worst case, an HSA in retirement acts like a traditional IRA. In the best case, it pays for medical costs with money that was never taxed at all, and most retirees have medical costs. Medicare premiums for Part B and Part D, for example, are generally qualified expenses for HSA purposes. Medigap premiums are not.
HSAs also have no required minimum distributions for the original owner.
When this strategy doesn’t fit
- You can’t afford the deductible. If paying $3,400 out of pocket would mean carrying a credit card balance, spend the HSA on medical bills. The tax savings won’t cover 22% card interest.
- You have regular, high medical costs. An HDHP can cost more than a lower-deductible plan once you add up premiums and out-of-pocket spending. Compare the total cost for a typical year, not just the premium.
- You haven’t grabbed your 401(k) match yet. A match is usually a better return than anything else. Get that first, then fund the HSA.
Practical setup
Many HSAs hold your money in cash by default, sometimes earning almost nothing. Most providers let you invest the balance above a set amount, often $1,000 or $2,000, in mutual funds. Look for the “invest” or “investment account” option and check the fees.
If your employer’s HSA provider has high fees or poor fund choices, you can usually move the money to another provider later with a trustee-to-trustee transfer. That doesn’t count toward your annual limit and isn’t taxed, but leave payroll contributions going to the employer’s account so you keep the payroll tax savings.
Finally, when someone dies, a spouse who inherits an HSA can treat it as their own. A non-spouse beneficiary generally has to include the balance in income that year, so it makes sense to spend the account on medical costs during your lifetime, and to name a spouse as beneficiary if you’re married.
This post is general information, not financial advice.