What an HSA is and how the money moves

A Health Savings Account (HSA) is a bank account you own that holds money specifically for medical expenses. You put pre-tax dollars into it, the money grows tax-free, and you withdraw it tax-free when you pay for may have access to medical costs. Unlike a flexible spending account (FSA), which you lose at the end of the year, an HSA stays yours permanently — the balance rolls over and grows year after year.

The account is tied to a high-deductible health plan (HDHP), a type of health insurance with lower monthly premiums but a higher deductible. You cannot open an HSA without being enrolled in an HDHP. The insurance company does not manage the HSA itself; you choose a bank or financial institution to hold it, just as you would a regular savings account.

Money flows in three directions: you contribute from your paycheck (if your employer offers it) or from your personal bank account, the account earns interest or investment returns, and you withdraw it to pay doctors, pharmacies, hospitals, and other medical providers. You keep receipts and track what you spent it on, because the IRS requires proof that withdrawals were for may have access to medical expenses.

Key Takeaways

  • An HSA is a personal savings account for medical expenses that you own and control, separate from your health insurance plan.
  • You can only open an HSA if you are enrolled in a high-deductible health plan (HDHP), and you cannot be covered by other health insurance at the same time.
  • Money you contribute is not taxed, grows tax-free, and comes out tax-free when used for may have access to medical expenses — making it the most tax-efficient health account available.
  • Unlike an FSA, an HSA balance never expires; you can save it for years and use it in retirement, even after you stop working.
  • You choose which bank or financial company holds your HSA, and you can invest the money in stocks, bonds, or mutual funds rather than leaving it in cash.

Who can open an HSA and when

You must meet three conditions to open an HSA. First, you must be enrolled in an HDHP. The IRS sets the minimum deductible each year — for 2024, it is $1,600 for individual coverage and $3,200 for family coverage, though these numbers change annually. Your employer may offer an HDHP as one of their health plan choices, or you can buy one on your own through the health insurance marketplace.

Second, you cannot be covered by any other health insurance at the same time, with narrow exceptions. You cannot have both an HSA and a standard health plan, Medicare, Medicaid, TRICARE, or the Veterans Administration coverage. If you are claimed as a dependent on someone else's tax return, you cannot open an HSA either.

Third, you cannot have opened an HSA in the same calendar year already. You get one HSA per person per year. If you switch jobs or health plans mid-year, you still have the same HSA; you do not open a new one.

The best time to open an HSA is when you first enroll in an HDHP, because you can contribute for the entire year. If you enroll mid-year, you can still contribute, but only for the months you were covered by the HDHP. The deadline to contribute for a given year is April 15 of the following year (the tax filing deadline).

How much you can contribute and what happens to unused money

The IRS sets annual contribution limits, and they vary by whether you have individual or family coverage. For 2024, you can contribute up to $4,150 for individual coverage or $8,300 for family coverage. These limits increase slightly each year to account for inflation. If you are 55 or older, you can add an extra $1,000 per year (called a catch-up contribution).

If your employer offers an HSA, they may contribute on your behalf — this counts toward your limit, not in addition to it. For example, if your employer contributes $1,000 and you contribute $2,000, you have used $3,000 of your $4,150 limit. Any contributions beyond the limit are taxed and penalized, so tracking matters.

Money you do not spend in a given year stays in your account forever. There is no "use it or lose it" rule like there is with an FSA. You can let it accumulate for years, invest it, and use it decades later. This makes an HSA a powerful retirement savings tool — once you turn 65, you can withdraw money for any reason (not just medical expenses), though non-medical withdrawals are taxed as income.

What counts as a may have access to medical expense

may have access to medical expenses include doctor visits, hospital stays, prescription medications, dental work, vision care, mental health treatment, and medical equipment like wheelchairs or hearing aids. Deductibles, copays, and coinsurance all count. Over-the-counter medications (like pain relievers or allergy medicine) count only if you have a prescription for them.

Some expenses do not count: cosmetic surgery, gym memberships, vitamins without a prescription, and most dental work that is purely cosmetic. Long-term care insurance premiums count, but only up to certain limits set by the IRS. If you are unsure whether an expense qualifies, the IRS publishes a full list on its website, and your HSA provider can usually answer specific questions.

You do not have to spend the money in the same year you contribute it. You can contribute in 2024 and use it for a 2025 expense. You can also reimburse yourself for past medical expenses years later, as long as you have receipts and the expense occurred after you opened the HSA.

How to set up an HSA and where to hold it

Your employer may offer an HSA through payroll, in which case you enroll during open enrollment or when you first become may be able to access. Your employer will direct you to a specific bank or financial company that holds the account. Money is deducted from your paycheck before taxes, which lowers your taxable income.

If your employer does not offer an HSA, or if you buy your own HDHP, you can open an HSA at any bank, credit union, or investment company that offers them. Common providers include Fidelity, Lively, HealthEquity, and many traditional banks. You will need your Social Security number, proof of HDHP enrollment, and a personal bank account to link for transfers.

When you open an HSA, you choose how to hold the money: in a cash savings account (earning minimal interest), in a money market account, or invested in stocks and mutual funds. Some providers require a minimum cash balance (often $1,000 to $2,500) before you can invest the rest. Investment options vary by provider, so compare before you choose.

Once your HSA is open, you receive a debit card or checkbook to pay medical providers directly. You can also request a reimbursement check or transfer money to your personal bank account. Keep records of every withdrawal and the medical expense it paid for — the IRS can audit HSA accounts, and you need documentation to prove expenses were may have access to.

HSA vs. FSA: the key differences

Both accounts hold pre-tax money for medical expenses, but they work very differently. An FSA is temporary: you choose how much to contribute each year, and any money left over at the end of the year is forfeited (with a small carryover option in some plans). An HSA is permanent: your balance rolls over forever, and you own it even if you change jobs or retire.

An FSA is not tied to a specific type of health insurance — you can have an FSA with any health plan. An HSA requires an HDHP. An FSA is usually offered only through an employer; an HSA can be opened on your own. An FSA typically offers no investment options; an HSA lets you invest the balance in the stock market.

If you have access to both (some employers offer both accounts), you can contribute to only one per year. Most people choose the HSA because of the permanent balance and investment potential, but if you have predictable medical expenses and want to spend down the account each year, an FSA may suit you better.

Tax benefits and how they work

An HSA gives you three tax breaks. First, contributions are deductible from your taxable income — if you contribute $3,000, your taxable income drops by $3,000, which lowers your tax bill. If your employer deducts contributions from your paycheck, this happens automatically. If you contribute on your own, you deduct it on your tax return (Form 1040).

Second, the money inside the account grows tax-free. If you invest your HSA balance and earn $500 in gains, you owe no tax on those gains. This is different from a regular savings account or brokerage account, where you pay tax on interest and investment income each year.

Third, withdrawals for may have access to medical expenses are tax-free. You do not report them as income, and you do not owe tax on them. This is the most valuable benefit: you get a deduction going in, tax-free growth inside, and tax-free withdrawal going out — no other account offers all three.

If you withdraw money for a non-medical expense before age 65, you owe income tax on the withdrawal plus a 20% penalty. After age 65, the penalty goes away, but you still owe income tax on non-medical withdrawals. This makes the HSA a strong retirement savings tool: you can use it for medical expenses tax-free, or treat it like a regular retirement account after 65.

What happens to your HSA when you change jobs or retire

Your HSA belongs to you, not your employer. When you leave a job, the account stays open and the money stays yours. You can keep it at the same provider, or you can roll it to a new provider (similar to rolling over a 401(k)). You do not have to close it or spend the balance before you leave.

If your new employer offers an HSA, you can keep your old one and open a new one, but you can only contribute to one HSA per year. Many people keep their old HSA and let it grow while they contribute to the new one through payroll. Over time, you may end up with multiple HSAs from different jobs — this is allowed, but contributions across all of them cannot exceed the annual limit.

When you retire, your HSA continues to exist. You can withdraw money for medical expenses tax-free for the rest of your life. After age 65, you can withdraw money for any reason (not just medical), though non-medical withdrawals are taxed as ordinary income. This makes an HSA a valuable retirement asset — it functions like a second retirement account with a medical expense advantage.

Frequently Asked Questions

Can I use my HSA to pay for my spouse's medical expenses?

Yes, if your spouse is not covered by their own health insurance. If your spouse has their own health plan, they must use their own HSA or FSA. If your spouse has no health insurance, you can use your HSA to pay their medical bills. The expense still must be may have access to (doctor visits, prescriptions, etc.), and you need receipts.

What if I withdraw money from my HSA and later find out the expense was not may have access to?

You owe income tax on the withdrawal plus a 20% penalty. The IRS does not forgive this if you made an honest mistake. To avoid this, check the IRS list of may have access to expenses before you withdraw, or ask your HSA provider whether a specific expense counts before you pay for it.

Can I use my HSA to buy health insurance premiums?

Only in specific situations. You can use HSA money to pay premiums for COBRA coverage (if you lose your job), long-term care insurance, or health insurance while you are receiving unemployment benefits. You cannot use it to pay premiums for your current health plan or for Medicare (except Medicare supplemental insurance after age 65).

What happens to my HSA if I switch from an HDHP to a regular health plan?

Your HSA stays open and the money stays yours. You cannot contribute new money once you are no longer enrolled in an HDHP, but you can withdraw money for may have access to medical expenses indefinitely. Many people keep their HSA open for years after switching plans, using it as a medical savings account.

Do I have to use my HSA debit card, or can I pay out of pocket and reimburse myself later?

You can do either. Some people pay medical bills from their personal bank account and then reimburse themselves from the HSA weeks or months later. This lets the HSA balance grow longer. You must keep receipts and documentation for any expense you reimburse yourself for, in case the IRS audits your account.