A health savings account lets you set aside pre-tax money specifically for medical costs, and keep what you don't spend

The core purpose of an HSA is to give you a way to pay for healthcare expenses with money that hasn't been taxed yet—and to let that money grow tax-free if you don't use it when ready. Unlike a flexible spending account (FSA), which forces you to spend the money or lose it each year, an HSA rolls over whatever balance remains. You own the account and the money in it, even if you change jobs or health insurance.

An HSA works as a three-part tool: you contribute money before taxes are taken out of your paycheck (or you deduct contributions on your tax return if you're self-employed), you use that money to pay for may have access to medical expenses, and any balance left over stays in the account and can grow through investment, just like a retirement account. The money you withdraw for may have access to medical costs comes out tax-free. If you withdraw money for non-medical reasons before age 65, you pay income tax plus a 20 percent penalty on that amount.

Key Takeaways

  • An HSA reduces your taxable income in the year you contribute, lowering what you owe in federal income tax.
  • Money you don't spend on medical costs stays in the account and can be invested to grow over time, unlike FSA money which disappears at year-end.
  • You can withdraw HSA funds tax-free for any may have access to medical expense: copays, deductibles, prescriptions, dental work, vision care, and many other costs.
  • After age 65, you can withdraw HSA money for any reason without the 20 percent penalty, though non-medical withdrawals are still taxed as regular income.

How an HSA reduces what you pay in taxes

When you contribute money to an HSA through your employer's payroll, that money comes out before your employer calculates federal income tax, Social Security tax, and Medicare tax. If you contribute $3,000 in a year and you're in the 22 percent federal tax bracket, you save roughly $660 in federal taxes alone. That's money that stays in your pocket instead of going to the IRS.

If you're self-employed or your employer doesn't offer an HSA, you can still open one and deduct your contributions on your tax return (Form 1040), which produces the same tax savings. The contribution limits change each year—check the current limits with your HSA provider or the IRS website, since they vary based on whether you have individual or family coverage.

Why the money you don't spend matters

An FSA requires you to spend the money within the calendar year or lose it (with a small carryover exception in some plans). An HSA has no "use it or lose it" rule. If you contribute $2,500 and spend only $800 on medical costs, the remaining $1,700 stays in your account. That balance can sit there indefinitely, or you can invest it in mutual funds or other options your HSA provider offers, letting it grow over decades.

This makes an HSA function partly as a retirement savings tool. Many people use it to pay medical expenses out of pocket during their working years and let the HSA balance grow untouched. After age 65, you can withdraw the money for any reason—medical or not—and only pay income tax on non-medical withdrawals (no 20 percent penalty). This turns an HSA into a second retirement account, similar to a traditional IRA.

What counts as a may have access to medical expense

may have access to expenses include the obvious ones: copays, coinsurance, deductibles, prescription medications, and insulin. They also include dental work (fillings, root canals, orthodontia), vision care (glasses, contacts, eye exams), hearing aids, and mental health treatment. Physical therapy, chiropractic care, and acupuncture count if a doctor prescribes them. Over-the-counter medications like pain relievers and allergy medicine count only if you have a prescription.

Some costs that sound medical don't may have access to: cosmetic surgery, gym memberships, vitamins (unless prescribed for a specific deficiency), and most over-the-counter items without a prescription. If you're unsure whether a specific expense qualifies, your HSA provider's website usually has a searchable list, or you can ask them directly before you spend the money.

The connection between your health plan and your HSA

You can only open and contribute to an HSA if you're enrolled in a high-deductible health plan (HDHP). An HDHP has a higher deductible than a standard health plan—meaning you pay more out of pocket before insurance kicks in—but lower monthly premiums. The IRS sets minimum deductible amounts each year; for 2024, an individual HDHP must have a deductible of at least $1,600, and a family plan at least $3,200 (these amounts change annually).

The trade-off is intentional: the lower premiums you save by choosing an HDHP often match or exceed what you'd contribute to an HSA, and the HSA gives you a tax-advantaged way to cover that higher deductible. If you switch to a non-HDHP plan, you can no longer contribute to an HSA that year, but the money already in your account stays there and you can still withdraw it for may have access to medical costs.

When an HSA makes financial sense

An HSA works best if you're relatively healthy and don't expect large medical bills in the near term. Because you're choosing a higher deductible, you're betting that you won't hit it—or that you can cover it from your HSA balance. If you have chronic conditions requiring frequent specialist visits or expensive medications, an HDHP and HSA might cost more than a traditional plan with lower deductibles.

An HSA also makes sense if you have the income to contribute money and not when ready spend it. If you're living paycheck to paycheck and need to use every dollar for current medical costs, the tax savings are real but modest. If you can afford to let money accumulate, an HSA becomes a powerful long-term savings tool because of the triple tax advantage: contributions are tax-deductible, growth is tax-free, and withdrawals for medical costs are tax-free.

What happens to your HSA if you change jobs or insurance

Your HSA is yours alone—it's not tied to your employer or your health plan. If you leave your job, the HSA stays with you. You can keep it open, continue to invest the balance, and withdraw money for medical costs whenever you need it. You straightforward can't make new contributions unless you're still enrolled in an HDHP (either through a new employer or one you purchase on your own).

If you switch from an HDHP to a different type of health plan, the same rule applies: the money in your HSA remains accessible for may have access to medical expenses, but you can't add new contributions that year. Once you return to an HDHP, you can resume contributions. This portability is one of the main advantages of an HSA over an FSA, which you typically lose when you change jobs.

Frequently Asked Questions

Can I use my HSA to pay for my spouse's or children's medical costs?

Yes, as long as they're covered under your health insurance plan or you claim them as dependents on your tax return. The money doesn't have to be used only for your own medical expenses. This is useful for families where one person has the HDHP and HSA but multiple family members have medical costs.

What happens if I withdraw money from my HSA for something that isn't a medical expense?

Before age 65, you'll owe income tax on the withdrawal plus a 20 percent penalty. After age 65, you owe income tax but no penalty. Keep receipts for all medical expenses you pay from your HSA in case the IRS asks for documentation later.

Can I invest the money in my HSA, or does it just sit in a savings account?

Most HSA providers let you invest the balance in mutual funds, stocks, or bonds, similar to a 401(k) or IRA. Some require a minimum balance (often $1,000 to $2,500) before you can invest. Check your provider's options—investment choices vary widely between providers.

What if I don't use all my HSA money by the end of the year?

Unlike an FSA, unused HSA money rolls over to the next year with no limit. You can let it accumulate for decades. This is why an HSA can serve as a retirement savings tool if you don't need to spend it on current medical costs.

Do I have to report my HSA on my tax return?

If you contribute through your employer's payroll, the contributions are already pre-tax and don't need to be reported. If you contribute on your own (self-employed or non-employer contributions), you deduct them on Form 1040. Withdrawals for may have access to medical expenses don't need to be reported, but keep receipts in case of an audit.