An HSA lets you set aside pre-tax money specifically for medical costs, and keep what you don't spend

A Health Savings Account (HSA) is a savings account attached to a high-deductible health insurance plan. Money you put into it reduces your taxable income, grows without being taxed, and you can withdraw it tax-free to pay for medical expenses. The key difference from other accounts: anything you don't spend stays yours to keep, and it rolls over year to year.

Think of it as a medical expense fund that the government helps you build. Your employer, you, or both can contribute money. That money sits in an account earning interest or investment returns. When you have a medical bill—a doctor visit, prescription, dental work, or glasses—you pay it from the HSA instead of from your regular paycheck. Because the money came in pre-tax, you've already saved on income tax.

The catch is that you can only open an HSA if you're enrolled in a high-deductible health plan (HDHP). These plans have lower monthly premiums but higher deductibles—the amount you pay out of pocket before insurance kicks in. An HSA helps bridge that gap by giving you tax-advantaged money to cover those early costs.

Key Takeaways

  • Money in an HSA is not taxed when you put it in, not taxed while it grows, and not taxed when you withdraw it for medical expenses—a triple tax advantage no other account offers.
  • You must be enrolled in a high-deductible health plan to open or contribute to an HSA; you cannot have an HSA with a standard health plan.
  • Unused money stays in your account and carries over to the next year, unlike a Flexible Spending Account (FSA) which you typically lose if you don't spend it.
  • After age 65, you can withdraw HSA money for any reason without penalty, though non-medical withdrawals are taxed as income.

How the tax advantage works

An HSA gives you three layers of tax savings. First, money you contribute reduces your taxable income for the year—the same way a 401(k) contribution does. If you earn $50,000 and put $3,000 into an HSA, you only report $47,000 as taxable income. That means you pay income tax on $3,000 less.

Second, any interest or investment gains inside the account are not taxed. If your HSA balance grows from $5,000 to $5,500 because of interest, that $500 gain is tax-free. Most other savings accounts tax you on interest earned.

Third, when you withdraw money to pay for medical expenses, that withdrawal is not taxed. You're not paying tax on the money going in, the growth, or the money coming out—as long as it goes to a may have access to medical expense. This triple tax advantage is why financial advisors often call an HSA the most powerful savings tool available.

Why HSAs pair with high-deductible plans

A high-deductible health plan has a lower monthly premium (what you pay every month) but a higher deductible (what you pay out of pocket before insurance covers costs). For 2024, the IRS defines a high-deductible plan as one with a deductible of at least $1,600 for individual coverage or $3,200 for family coverage, though these numbers change yearly.

The trade-off is that you pay more upfront when you get medical care. An HSA helps you handle those upfront costs with pre-tax money. If you choose a high-deductible plan but don't open an HSA, you're paying that deductible with after-tax dollars—money you've already paid income tax on. An HSA lets you use pre-tax dollars instead, which is why the combination makes financial sense for many people.

Not everyone benefits from this trade-off. If you expect high medical costs in the coming year, a standard plan with a lower deductible might cost less overall, even with higher premiums. An HSA works best for people with predictable, moderate medical expenses or those who can afford to cover the deductible themselves.

What counts as a medical expense you can pay from an HSA

The IRS maintains a specific list of what qualifies. Common expenses include doctor visits, hospital stays, prescription medications, dental work, vision care, mental health treatment, and medical equipment like crutches or hearing aids. You can also use HSA money for some over-the-counter items like pain relievers or allergy medicine, but only if you have a prescription or doctor's note.

Some expenses people assume may have access to actually don't. Cosmetic procedures, gym memberships, and vitamins (unless prescribed for a specific condition) are not covered. Long-term care insurance premiums are covered up to a limit, but life insurance and disability insurance are not. The IRS publishes a full list on its website if you're unsure about a specific expense.

You don't have to spend the money in the same year you contribute it. You can let it accumulate for years and use it whenever you need it. Some people use their HSA as a long-term investment account, contributing the maximum each year and only withdrawing for major medical expenses, letting the rest grow.

HSA vs. FSA: why the difference matters

An HSA and a Flexible Spending Account (FSA) both let you set aside pre-tax money for medical expenses, but they work very differently. An FSA is "use it or lose it"—money you don't spend by the end of the year is forfeited, though some plans allow a small carryover or grace period. An HSA rolls over completely. Any balance you don't spend stays in your account indefinitely.

An HSA is also portable. If you change jobs, your HSA comes with you. An FSA is tied to your employer's plan and ends when you leave the job. An HSA can be invested in stocks, bonds, or mutual funds, so it can grow over time. Most FSAs are held in a straightforward savings account earning little to no interest.

Because of these differences, an HSA is often better for long-term planning, while an FSA is better if you have predictable medical expenses you'll definitely use each year. Some people have both—an FSA through their employer for near-term expenses and an HSA for longer-term savings.

Contribution limits and who can open one

The IRS sets annual contribution limits that change each year. For 2024, you can contribute up to $4,150 if you have individual coverage or $8,300 if you have family coverage through your HSA. If you're 55 or older, you can add an extra $1,000 per year as a catch-up contribution. These limits explore to the total of all contributions—from you, your employer, and anyone else contributing on your behalf.

You can only open an HSA if you're enrolled in a high-deductible health plan and have no other health coverage (with limited exceptions for specific plans like dental or vision-only insurance). You also cannot be claimed as a dependent on someone else's tax return, and you cannot be enrolled in Medicare. If any of these change during the year, you may lose HSA may be able to access and need to stop contributing.

If your employer offers an HSA, they typically handle the setup and may contribute money on your behalf. If you buy your own high-deductible plan through the health insurance marketplace, you can open an HSA through a bank, credit union, or investment company. The account is yours personally—it doesn't belong to your employer, so you keep it even if you change jobs.

What happens to your HSA after age 65

At 65, you become may be able to access for Medicare, which disqualifies you from contributing to an HSA. However, you keep the money already in your account and can continue to withdraw it for medical expenses tax-free for the rest of your life. This makes an HSA a powerful retirement savings tool if you've accumulated a large balance.

After 65, you can also withdraw HSA money for any reason without penalty—you just pay income tax on non-medical withdrawals, the same as you would with a traditional IRA. This flexibility is why some people view an HSA as a retirement account first and a medical savings account second, especially if they're healthy and don't expect to use the money for medical costs in the near term.

Frequently Asked Questions

Can I use HSA money to pay my health insurance premiums?

You cannot use HSA money to pay your monthly health insurance premiums. You can use it to pay for COBRA continuation coverage, long-term care insurance premiums (up to a limit), and Medicare premiums after you turn 65. But regular monthly premiums must come from other funds.

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

Before age 65, non-medical withdrawals are taxed as income and hit with a 20% penalty. After 65, you pay income tax but no penalty. Keep receipts for all medical expenses you pay from your HSA in case the IRS asks to verify that withdrawals were legitimate.

Can my employer see what I spend my HSA money on?

No. Your HSA is your personal account. Your employer can see how much they contributed and how much you contributed, but not what you spent it on. The account is private between you and the financial institution holding it.

What if I change jobs—do I lose my HSA?

No. Your HSA is yours to keep regardless of employment changes. You can continue to use the money for medical expenses and can keep contributing if your new employer offers a high-deductible plan. If your new plan is not high-deductible, you stop contributing but keep the balance.

Is an HSA a good investment account, or should I just keep the money in savings?

That depends on your timeline and comfort with risk. If you don't expect to need the money soon, investing it can help it grow faster than a savings account. If you might need it within a few years for medical expenses, keeping it in a low-risk savings option makes more sense. Many HSA providers let you choose between savings and investment options.