A Health Savings Account (HSA) is a tax-advantaged account that lets you set aside money specifically for medical expenses. You contribute pre-tax dollars, the balance grows tax-free, and withdrawals for qualified medical costs are also tax-free. That triple tax benefit makes it one of the most powerful savings tools available, but it comes with specific eligibility rules and contribution limits.
Who Can Open an HSA
To qualify for an HSA, you need to be enrolled in a high-deductible health plan (HDHP). These are health insurance plans with lower monthly premiums but higher deductibles, meaning you pay more out of pocket before insurance kicks in. Not every high-deductible plan qualifies. The IRS sets specific minimum deductible and maximum out-of-pocket thresholds each year, and your plan must meet both.
Beyond the plan requirement, you also can’t be enrolled in Medicare, claimed as a dependent on someone else’s tax return, or covered by another health plan that isn’t an HDHP (with some exceptions for dental and vision coverage). If you meet all the criteria, you can open an HSA through your employer’s benefits program or independently through a bank or financial institution that offers them.
The Triple Tax Advantage
HSAs are sometimes called “triple tax-advantaged” because they provide tax savings at three separate points:
- Contributions are tax-free. Money you put into your HSA reduces your taxable income. If your employer deducts contributions from your paycheck, those dollars also skip Social Security and Medicare taxes, saving you an additional 7.65%.
- Growth is tax-free. Any interest or investment gains inside your HSA accumulate without being taxed.
- Withdrawals for medical expenses are tax-free. When you use the money for qualified health costs, you pay zero tax on it.
No other account in the U.S. tax code offers all three benefits simultaneously. A traditional 401(k) gives you a tax break on contributions but taxes withdrawals. A Roth IRA taxes contributions but not withdrawals. An HSA, used for medical expenses, is tax-free at every stage.
How Much You Can Contribute
The IRS caps how much you can put into an HSA each year. For 2025, the limit is $4,300 for individual coverage and $8,550 for family coverage. In 2026, those numbers rise slightly to $4,400 and $8,750. If you’re 55 or older, you can contribute an extra $1,000 per year on top of the standard limit.
These caps include all contributions from every source. If your employer contributes $1,000 to your HSA, that counts toward your annual limit, and you can only add the remaining amount yourself. Going over the limit triggers a 6% excise tax on the excess for every year it stays in the account, so it’s worth tracking your total carefully.
What You Can Spend It On
HSA funds cover a broad range of medical, dental, and vision expenses. The IRS defines qualified expenses as costs related to diagnosing, treating, or preventing disease, including equipment and supplies needed for those purposes. In practical terms, that includes:
- Doctor and hospital visits, including copays and deductibles
- Dental work such as cleanings, fillings, braces, extractions, and dentures
- Vision care including eye exams, glasses, contact lenses, and laser eye surgery
- Prescription medications and insulin
- Birth control including prescribed pills and condoms
- Pregnancy test kits
- COVID-related protective equipment like masks and hand sanitizer
What doesn’t qualify: general health items like vitamins, gym memberships, or cosmetic procedures. Over-the-counter medications only qualify if they’re prescribed by a doctor (insulin is the exception). The line the IRS draws is between treating or preventing a specific medical condition versus things that are “merely beneficial to general health.”
Investing Your HSA Balance
Most people use their HSA like a checking account, depositing money and spending it on medical bills throughout the year. But HSAs also let you invest the balance in mutual funds or other options, similar to a retirement account. Most providers require you to keep a cash threshold (commonly $2,000) in your account before you can invest, meaning you’d typically need around $2,100 before transferring anything since the minimum transfer is usually $100.
Investing makes the most sense if you can afford to pay current medical expenses out of pocket and let your HSA balance grow. Over years or decades, that tax-free growth can turn a modest HSA into a significant financial asset. This is where the HSA starts to function less like a spending account and more like a retirement savings vehicle.
The Reimbursement Strategy
One of the most overlooked features of an HSA is the reimbursement rule. The IRS places no time limit on paying yourself back for qualified medical expenses. You could pay for a doctor visit out of pocket today, save the receipt, and reimburse yourself from your HSA five, ten, or twenty years later. The only requirement is that the expense occurred after you opened the account.
This creates a powerful long-term strategy. By paying medical costs out of pocket now and letting your HSA balance grow through investments, you build up a pool of tax-free money you can withdraw at any point by matching it to old receipts. The catch is record-keeping. If the IRS audits your HSA distributions and you can’t prove they matched qualified expenses, you’ll owe income tax on the withdrawals plus a 20% penalty. Save every receipt and keep detailed records of dates, amounts, and what the expense was for.
How HSAs Work After Age 65
Once you enroll in Medicare, you can no longer contribute to your HSA. If you’re still working past 65, you and your employer should stop contributions six months before you apply for Medicare or Social Security benefits to avoid a tax penalty. However, you can still spend the money already in your account tax-free on qualified medical expenses, including Medicare premiums, for the rest of your life.
After 65, the penalty structure also changes. Normally, withdrawing HSA funds for non-medical purposes triggers income tax plus a 20% penalty. Once you turn 65, the 20% penalty disappears. You’ll still owe regular income tax on non-medical withdrawals, which effectively makes your HSA function like a traditional retirement account for non-health spending. For medical expenses, withdrawals remain completely tax-free at any age.
HSA vs. FSA
Flexible Spending Accounts (FSAs) also let you set aside pre-tax money for medical expenses, but the two accounts work very differently. The biggest distinction is ownership. An HSA belongs to you. You control the funds, keep them when you change jobs, and carry the balance forward indefinitely. An FSA belongs to your employer. If you leave your job, you generally lose access to any remaining balance.
FSAs also operate on a use-it-or-lose-it basis. You need to spend the money within the plan year, though some employers allow a small carryover amount or a short grace period. HSA balances roll over every year with no expiration. FSAs don’t require a high-deductible health plan, which makes them accessible to more people, but they lack the investment option, the portability, and the long-term accumulation that make HSAs uniquely valuable as both a health spending tool and a savings strategy.