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 never taxed. That triple tax benefit makes it one of the most powerful savings tools available, but you need to meet specific eligibility requirements to open one.
Who Can Open an HSA
To qualify for an HSA, you must be enrolled in a high-deductible health plan (HDHP). For 2025, that means your plan’s deductible is at least $1,650 for individual coverage or $3,300 for family coverage. Your total out-of-pocket maximum can’t exceed $8,300 for self-only coverage or $16,600 for a family plan.
Beyond the insurance requirement, you can’t be enrolled in Medicare, claimed as a dependent on someone else’s tax return, or covered by a non-HDHP plan (like a spouse’s traditional insurance). If you meet all the criteria, you can open an HSA through your employer’s benefits program or directly with a bank, credit union, or investment firm like Fidelity.
The Triple Tax Advantage
HSAs offer three distinct tax benefits that no other account type combines:
- Tax-deductible contributions. Every dollar you put in reduces your taxable income for the year. If you contribute $4,000 and you’re in the 22% tax bracket, that’s $880 back at tax time.
- Tax-free growth. Any interest, dividends, or investment gains inside the account are never taxed while they remain there. This lets your balance compound faster than it would in a regular brokerage account.
- Tax-free withdrawals. When you use the money for qualified medical expenses, you pay zero taxes on the withdrawal, regardless of how much the account has grown.
No other savings vehicle in the U.S. tax code offers all three at once. A traditional 401(k) gives you a deduction going in but taxes you coming out. A Roth IRA taxes you going in but not coming out. An HSA, used for medical expenses, is tax-free at every stage.
How Much You Can Contribute
The IRS sets annual contribution limits that adjust for inflation. For 2025, you can contribute up to $4,300 with self-only HDHP coverage or $8,550 with family coverage. If you’re 55 or older, you can add an extra $1,000 per year as a catch-up contribution.
Contributions can come from you, your employer, or both. Employer contributions count toward your annual limit. If your employer puts in $1,000 toward your individual HSA, you can contribute up to $3,300 yourself to reach the $4,300 cap. Any contributions over the limit trigger a 6% excess contribution penalty for each year the overage stays in the account.
What You Can Spend It On
Qualified medical expenses cover a broad range of costs. The obvious ones include doctor visits, hospital stays, surgeries, and prescription medications (including insulin). But the list extends well beyond that. Dental work like cleanings, fillings, braces, and dentures all qualify. So do eye exams, glasses, contacts, and laser eye surgery.
Over-the-counter products qualify too, including sunscreen, menstrual products, and many common medicines. Prescribed drugs are always covered, though nonprescription items like nicotine patches for smoking cessation generally don’t qualify unless specifically prescribed. The IRS defines a qualified expense as anything related to the diagnosis, cure, treatment, or prevention of disease, or anything that affects a structure or function of the body.
Cosmetic procedures, gym memberships, and general wellness supplements typically don’t qualify. When in doubt, IRS Publication 502 has the full list.
What Happens If You Use It for Non-Medical Costs
If you withdraw money for something that isn’t a qualified medical expense before age 65, you’ll owe income tax on the amount plus a 20% penalty. That’s steep enough to make non-medical withdrawals a bad idea for most people.
After age 65, the penalty disappears. You’ll still owe ordinary income tax on non-medical withdrawals, which makes the account function like a traditional IRA at that point. For medical expenses, withdrawals remain completely tax-free at any age.
Investing Your HSA Balance
Most people treat their HSA like a checking account, keeping cash on hand for medical bills. But many HSA providers also let you invest the balance in mutual funds, index funds, or other options, similar to a 401(k). Fidelity, for example, lets you start investing with as little as $10 and charges no account fees.
Some employer-sponsored HSA providers require you to keep a minimum cash balance (often $1,000 or $2,000) before the rest can be invested. If your provider has high fees or limited investment options, you can transfer your HSA to a different custodian at any time.
Investing makes the most sense if you can afford to pay current medical bills out of pocket and let your HSA grow for years or decades. The tax-free growth turns the HSA into a powerful long-term retirement tool, especially for healthcare costs later in life.
Your Money Never Expires
Unlike a Flexible Spending Account (FSA), an HSA has no “use it or lose it” rule. Your balance rolls over every year indefinitely. The account belongs to you, not your employer. If you change jobs, get laid off, or switch to a non-HDHP insurance plan, the money stays yours. You just can’t make new contributions while you’re not on an HDHP.
The Shoebox Strategy
One of the most overlooked HSA features: there is no deadline to reimburse yourself for a qualified medical expense. You could pay for a dental filling out of pocket today, save the receipt, and withdraw that amount from your HSA ten or even thirty years from now, tax-free. The only requirement is that the expense occurred after your HSA was established.
This approach, sometimes called the “shoebox strategy,” lets your HSA balance compound untouched for decades while you build a growing stack of receipts for future tax-free withdrawals. Someone who tracks medical expenses over a 30-year career could accumulate tens of thousands of dollars in reimbursable costs. The catch is that the recordkeeping burden falls entirely on you. If the IRS ever questions a withdrawal, you need the receipt to prove it was a legitimate medical expense. A folder of scanned receipts stored digitally works well for this.
For people who can afford to pay medical costs out of pocket during their working years, this strategy effectively turns the HSA into a tax-free retirement account with no required minimum distributions and no restrictions on withdrawal timing.