What Is a Health Savings Account (HSA)? Rules, Limits and Benefits

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A health savings account (HSA) is a tax-advantaged account in the United States for people covered by a high-deductible health plan (HDHP). It holds money set aside for qualified medical expenses. You or your employer contribute up to an annual IRS limit, the balance can be invested, and unused money rolls over from year to year instead of expiring. The account belongs to you, not to your employer or insurer, so it stays with you when you change jobs or health plans.

HSAs were created by the Medicare Prescription Drug, Improvement, and Modernization Act of 2003 and became available in 2004. They replaced the earlier, more restricted Archer Medical Savings Account (MSA) as the main tax-favored savings vehicle paired with high-deductible coverage.

Who can open an HSA

The IRS sets four eligibility conditions. To contribute to an HSA for a given month, you must:

1. Be covered by a qualified high-deductible health plan.
2. Have no other health coverage that would disqualify you (with exceptions for items such as dental, vision and certain limited coverage).
3. Not be enrolled in Medicare.
4. Not be claimable as a dependent on someone else’s tax return.

Eligibility depends on your coverage, not your job. Employees can open an HSA through an employer, and self-employed or unemployed people can open one on their own at a bank, brokerage or specialized HSA custodian, as long as they meet the same four tests. Family members and employers can also contribute to your account.

Medicare is the condition that ends contributions for most long-term holders. From the first month you are enrolled in Medicare, you can no longer put new money into an HSA. The existing balance remains yours, and you can keep taking tax-free distributions for qualified expenses.

How a health savings account works

An HSA has two sides: the insurance plan that makes you eligible, and the account itself.

The high-deductible health plan

An HDHP charges lower premiums than many traditional plans but has a higher deductible, meaning the plan pays little or nothing for most non-preventive care until you have paid the deductible out of pocket. To qualify for HSA pairing, the plan must meet IRS minimum deductibles and stay under IRS maximums for out-of-pocket costs.

Once you have met the deductible, the remaining covered costs are usually shared between you and the insurer through coinsurance or co-pays, until you reach the out-of-pocket maximum.

The account

The HSA is held by a custodian (a bank, credit union, brokerage or other IRS-approved trustee). Contributions must be in cash, not stock or other property. Money typically lands in a cash or savings sweep first; many custodians also let you move part of the balance into mutual funds, stocks or other securities. Many accounts come with a debit card for paying providers directly, and you can also pay out of pocket and reimburse yourself later from the account.

The annual limit covers all contributions combined, whether they come from you, your employer or a relative. You can make contributions for a tax year up to the federal filing deadline for that year, which is generally mid-April of the following year.

The catch-up amount applies if you are 55 or older by the end of the tax year. The IRS adjusts the main limits and HDHP thresholds for inflation each year; the catch-up figure is set by statute and has stayed at $1,000.

Putting in more than the limit creates an excess contribution. The excess is not deductible and is subject to a 6% excise tax for each year it remains in the account, so it needs to be withdrawn (along with any earnings on it) or applied to a later year’s limit.

The triple tax advantage

HSAs are unusual in the U.S. tax code because money can go in, grow and come out without federal income tax.

• Contributions. Payroll contributions made through an employer’s cafeteria plan are excluded from your taxable wages. They also avoid Social Security and Medicare (FICA) taxes. Contributions you make directly are deductible on your federal return, whether or not you itemize.
• Growth. Interest, dividends and capital gains inside the account are not taxed. Buying and selling investments within an HSA does not create a taxable event.
• Withdrawals. Distributions used for qualified medical expenses are tax-free. Amounts you spend on expenses covered by your HDHP also count toward meeting the plan’s deductible.

State treatment can differ. California and New Jersey, for example, do not follow the federal exclusion and tax HSA contributions and earnings at the state level.

Worked example: an HDHP claim paid from an HSA

Hypothetical example for illustration only. Suppose you have self-only HDHP coverage with a $1,600 deductible and 20% coinsurance after the deductible. You have not had any medical costs this year when a $3,500 covered claim comes in.

1. Deductible: you pay the first $1,600.
2. Remainder: $3,500 − $1,600 = $1,900 is left.
3. Coinsurance: you pay 20% of $1,900 = $380. The insurer pays the other $1,520.
4. Your total cost: $1,600 + $380 = $1,980.

If your HSA holds at least $1,980, you can pay the full amount from the account tax-free. Assuming a 22% federal income tax bracket and payroll contributions that also skip the 7.65% FICA tax, that $1,980 of contributions avoided roughly $587 in federal taxes ($1,980 × 29.65%) compared with paying the bill from regular take-home pay. Your own savings depend on your bracket, state and whether you contributed through payroll or directly.

The insurer’s share and the coinsurance percentage come from your plan contract, not from HSA rules. Plans vary, and some use fixed co-pays instead of coinsurance for certain services.

Using HSA funds: withdrawal rules

Qualified medical expenses follow the IRS definition of medical care. They include deductibles, co-pays and coinsurance; doctor and hospital visits; dental and vision care; prescription drugs; mental health and psychiatric treatment; and, since the CARES Act of 2020, over-the-counter medicines and menstrual care products. Expenses for your spouse and dependents count too, even if they are not on your HDHP.

Your custodian reports distributions on Form 1099-SA, and you report them on Form 8889 with your tax return. The IRS does not require you to prove each expense to the custodian when you withdraw money, but you are responsible for keeping receipts that show each distribution matched a qualified expense.

Insurance premiums

Premiums are generally not a qualified expense. The exceptions are:

• COBRA or other health care continuation coverage
• Health coverage while you are receiving unemployment compensation
• Medicare premiums and other health coverage if you are 65 or older (Medigap supplemental policies excluded)
• Qualified long-term care insurance, up to annually adjusted limits

Non-qualified withdrawals

You can take money out for any purpose, but a non-qualified withdrawal is added to your taxable income and, if you are under 65, hit with an additional 20% penalty. After 65 (or if you become disabled), the penalty disappears and only ordinary income tax applies. At that point a non-medical HSA withdrawal is taxed much like a traditional IRA or 401(k) distribution, while medical withdrawals remain tax-free.

Rollover, investing and long-term use

HSA balances never expire. Anything you don’t spend stays in the account, and the money remains yours if you leave your employer, switch to a non-HDHP plan or retire. If you lose eligibility, you simply stop contributing; you can still spend the balance tax-free on qualified expenses.

There is also no vesting schedule. Contributions to an HSA, including your employer’s, are nonforfeitable from the moment they are deposited. That differs from many 401(k) plans, where employer matches may vest over several years.

Because funds can be invested and carried forward indefinitely, some holders treat an HSA as a second retirement account: they pay current medical costs from regular income, leave the HSA invested, and draw on it later for health costs in retirement, which tend to rise with age. The mechanism behind that strategy is ordinary compound interest, applied to a balance that is never taxed if spent on medical care.

Hypothetical example: $3,000 contributed each year for 20 years, earning an assumed 5% annually with no withdrawals, would grow to roughly $99,000. The return is an assumption, not a forecast; HSA investments can lose value, and cash options may earn far less.

This approach suits people who can afford their deductible without tapping the account. It appears often in early-retirement planning such as the FIRE movement, where tax-free medical money bridges the years before Medicare.

What happens at death

If your spouse is the named beneficiary, the HSA passes to them and becomes their own HSA, with no tax due. If anyone else inherits it, the account stops being an HSA on the date of death. The fair market value becomes taxable income to that beneficiary, reduced by any of the decedent’s qualified medical expenses paid from the account within one year after death. If the estate is the beneficiary, the value is included on the decedent’s final return.

Limitations of an HSA

• You need an HDHP that suits you. The account is only available alongside a high-deductible plan. That structure works best for people who can absorb the deductible; for someone with large, predictable medical costs, the lower premium may not offset the higher out-of-pocket spending.
• It takes spare cash. The tax benefit only applies to money you actually contribute. Someone who cannot set aside enough to cover a meaningful share of the deductible may find the plan’s upfront costs a burden.
• Record-keeping and filing. You must file Form 8889, track contributions across all sources against one annual limit, and keep receipts for every distribution, potentially for decades if you reimburse yourself years later.
• Fees and investment choices vary. Custodians differ in maintenance fees, investment fees, minimum cash balances before investing and fund selection. Those costs come out of the same tax-advantaged balance.

HSA vs. FSA, HRA and other look-alikes

The HSA is most often confused with the flexible spending account. Both pay for medical costs with pre-tax money, but the ownership and deadlines are different.

Other terms that get mixed up with HSAs:

• Health reimbursement arrangement (HRA): funded only by the employer, owned by the employer and used to reimburse your medical costs. You cannot contribute, and balances usually do not follow you to a new job.
• Limited-purpose FSA: an FSA restricted to dental and vision costs, designed so you can keep HSA eligibility while using both.
• Archer MSA: the predecessor account for self-employed people and small employers. New Archer MSAs are largely no longer opened.
• Health spending account (Canada): an employer benefit for Canadian employees, unrelated to the U.S. HSA despite the similar name.

FAQs

The Bottom Line

An HSA matters most to people on a high-deductible health plan who can cover the deductible from other savings. They can fund the account up to the annual limit, invest the balance, and keep the money through job changes and into retirement, with tax-free withdrawals for qualified medical costs. People with large, predictable medical bills or little spare cash should weigh whether the lower premium offsets higher out-of-pocket spending, and every holder needs to keep receipts.