What is an HSA? Your Health Account with a Hidden Superpower

An HSA, or Health Savings Account, is a tax-advantaged account for qualified medical expenses. Understanding how an HSA works, including its triple tax advantage and the 2026 HSA contribution limits, can help you make the most of it.

What Makes an HSA the most tax advantaged account in existence?

Over time, the federal government has added tax-qualified plans and accounts to the Internal Revenue Code. Their purpose is simple: to provide tax advantages to taxpayers who save for approved needs, such as retirement, education, or medical expenses, and then use those funds as intended. When taxpayers set aside money for these priorities, they are less likely to need government assistance later.

We are familiar with the tax advantages of traditional and Roth qualified plans for retirement, such as IRAs and 401ks, and 529 plans for education. HSAs for medical costs are even more tax advantaged than any of those:

Observe that the HSA is the only plan that allows for both tax-deductible contributions and tax-free withdrawals**. An eligible HSA contribution is an above-the-line deduction, so you don’t need to itemize to receive it. Like most items in the Internal Revenue Code, there are many exceptions and caveats to these rules, but in general, the concept holds: the HSA is the most tax advantaged account in existence.

** Exceptions for State income taxes in California and New Jersey, who do not comply with Federal Tax rules. Contributions to HSAs are not tax deductible for purposes of state income tax, and as a result, withdrawals are not taxed at the State level. In addition, interest, dividends, and realized capital gains within HSAs in these states are currently taxed each year for State income tax purposes, even though they are tax-free for Federal tax purposes.

What type of Medical Insurance Policy Must an HSA owner have?

An HSA is required to be paired with a High-Deductible Health Plan (HDHP). These are medical insurance policies with deductibles of at least $1,700 per person or $3,400 per family as of this writing in 2026. The out-of-pocket maximum for qualifying policies is $8,500 per person or $17,000 per family. Note that Medicare Insurance is not an HDHP, so once on Medicare, contributions to an HSA are not allowed. If HDHP coverage is discontinued, HSA contributions are no longer allowed; however, the HSA is not lost when you discontinue HDHP coverage.

If a person is covered under a spouse’s general-purpose medical insurance plan, they are ineligible for an HSA, even if the person is covered under their own HDHP. There are exceptions for limited purpose or post-deductible coverage.

What are the Advantages and Disadvantages of a High-Deductible Health Plan?

A High-Deductible health plan (HDHP) offers lower premiums because it leaves the policy holder responsible for more of the routine medical expenses, while the insurance company protects against large, unexpected costs. Preventive care is generally covered by an HDHP even before the deductible is met. This approach makes sense if the purpose of insurance is to protect against financial disasters rather than to prepay for everyday healthcare. A high-deductible policy allows you to keep more of your money when medical expenses are low, while still providing protection when serious or catastrophic medical expenses arise. For those in poor health who have high medical costs, an HDHP may not be advisable, but for healthy people who can afford to pay for medical costs up to a higher out-of-pocket maximum, they can be attractive.

What are the HSA Contribution Limits for 2026?

The maximum contribution to an HSA is $4,400 for self-only coverage and $8,750 for family coverage. At age 55, an additional catch-up contribution of $1,000 is allowed. The total with the catch up for a family HSA is $9,750. If each spouse has a self-only HSA, the total when the catch-up contributions are added is $10,800, because each self-only HSA qualifies for the $1,000 catch-up contribution. Some or all these contributions may be made by an employer on behalf of their employees.

What is the Special “Last-Month” Rule?

If you are HSA-eligible by December 1st of a given year, you can contribute the full annual limit even if you were not eligible for the entire year. In that case, you must remain eligible through the “testing period”, which is through December 31 of the following year. If you fail that test, some of the contribution will not be tax deductible.

What are the Two Components Within an HSA?

Every HSA has a cash component, which is a bank account or money market fund to which contributions are made and from which distributions are withdrawn. Most have a separate investment component, such as a brokerage account, to which HSA funds can be transferred from the cash component and invested in any number of securities. If the HSA will be invested for the long term, equity investments are often appropriate. The result of tax-free compounding in a diversified equity portfolio over decades is extremely powerful.

What Type of Medical Costs Qualify for Tax-Free HSA distributions?

To qualify for tax-free withdrawals, the funds must be used for medical expenses that were incurred after the HSA was established. The expenses must be for the HSA owner, the owner’s spouse, or the owner’s tax dependents. The person who incurs medical expenses need not be covered by the HDHP insurance policy. Almost any medical cost qualifies, including doctor, dentist, medications, vision care, mental health treatment, physical therapy, and chiropractic care. Medical insurance premiums or medical sharing ministry programs do not qualify; with exceptions for Part B Medicare premiums, COBRA coverage, premiums while receiving unemployment benefits, and long-term care premiums within limits.

What is the Best Way to Take Full Advantage of an HSA?

First, maximize your contributions. Second, take advantage of the fact that you don’t need to withdraw HSA money in the same year you incur medical expenses. If the HSA was established before the expense occurs, you can reimburse yourself years or decades later, provided you retain adequate records and the expense qualifies. This allows for long periods of tax-free growth in the HSA. An account with a long time horizon can appropriately be invested into equities, with the associated higher expected rate of return assumption.

To illustrate, here is a hypothetical scenario:

1. A married couple, age 55, establishes a family coverage HSA, depositing the maximum $9,750 into the cash account each year, and immediately transfers the funds to the HSA investment account, where it is invested into a diversified equity portfolio, earning an annually compounded 8% rate of return.
2. They do not use the HSA account; rather, they pay their out-of-pocket medical bills from other accounts. They save their medical receipts for future use.
3. They continue to make the deposits for ten years, at which point they begin Medicare coverage and are no longer able to contribute.
4. By age 75, the HSA has a value of roughly $330,000.
5. They add up all the receipts they have saved, and when added to their Medicare premiums, the total they have paid over the years exceeds $330,000.
6. They withdraw the entire HSA balance tax-free, using the receipts as evidence of the medical expenses.

This scenario demonstrates the ideal way to capture an HSA’s triple tax advantage: obtain 1) maximum income tax deductions, 2) tax-free compound growth for the long term, and 3) tax-free withdrawals.

Is There a Joint HSA?

An HSA is always owned by an individual; there are no joint HSAs. A couple can have one spouse’s HSA with the other spouse designated as the beneficiary, or two separate HSAs, one owned by each spouse. An HSA can be a “self only” HSA, in which case it is owned by one person and the associated HDHP insurance provides coverage only for that person, or it can be a “Family HSA” in which case it is still owned by only one person, but the person has family HDHP coverage, which covers themselves and at least one other eligible person. Note that if the HDHP covers only one person, the HSA must be a “self-only” HSA with the lower contribution limits, however, qualified medical expenses of the non-covered spouse also qualify for tax-free HSA withdrawals.

What Happens if an HSA withdrawal is Not Used to Pay Qualified Medical Expenses?

HSA withdrawals that are not used to pay qualified medical expenses are taxable as ordinary income. If the HSA owner is under age 65, there is also a 20% tax penalty. This is a very detrimental outcome indeed. Consider that a taxpayer who is under age 65 in a 35% Federal income tax bracket will lose over half the balance to taxes and penalties. In states with an income tax, the loss is even greater.

What Happens when a Married HSA Owner Dies with a Spouse Listed as Beneficiary?

If an HSA owner passes away and a spouse is listed as the HSA beneficiary, the HSA continues and is now owned by the surviving spouse. Medical expenses of the deceased that were incurred in past years after the HSA was originally established, still qualify for tax-free HSA withdrawals, provided those withdrawals take place within one year after the date of death. The surviving spouse can continue to use the HSA for qualifying past and future personal medical expenses, just as before.

What Happens to an HSA if the Beneficiary is Not a Spouse?

If the HSA beneficiary is not a spouse, the account is no longer an HSA as of the date of death of the HSA owner. The beneficiary receives the account value, and it is taxed as ordinary income in the year of death. This tax treatment is more detrimental than that of a traditional IRA because the entire account balance becomes taxable in one year, potentially spiking the tax bracket and ending all tax-favored status. For this reason, it is advisable to spend down HSA funds in old age to obtain tax-free withdrawals.

For those with charitable intent, the problem of excess HSA funds at death is solved by naming a charitable beneficiary. The charity will not pay tax on the bequest, and an estate tax deduction will reduce the taxable estate, reducing both federal and state estate tax.

For a taxpayer with charitable intent, with both a traditional IRA and an HSA, it is normally more effective to leave the IRA to individual beneficiaries and the HSA to charity than vice versa. That’s because an HSA inherited by a non-spouse individual creates an immediate income tax liability, whereas a charity doesn’t have that income tax problem. Non-spouse traditional IRA beneficiaries can spread the tax liability over multiple years, reducing the tax bracket and providing additional tax deferral.

The Big Reveal: The Hidden Superpower of an HSA

The HSA superpower is that it can save your life: an HSA puts you in control of the medical treatments you believe are worthwhile, not an insurance company. Private insurance companies and especially government plans such as Medicare are motivated to reduce costs, and at times they will accomplish that by rationing treatments, or denying expensive medical treatment, even when it is regarded as the most effective. In this age of rapid advancement in various cancer treatments, this is becoming more common. Your life is worth more than your money, and often an HSA owner will spend their HSA funds on an expensive medical treatment that was denied by their insurance company. Whether a treatment is FDA-approved, covered by insurance, or considered experimental by the medical community isn’t the decisive test.

Summary

For a person who:

1. Can obtain coverage through a High-Deductible HealthPlan, and
2. Is generally healthy, and
3. Can afford higher out-of-pocket medical costs when they occur, and
4. Wants to take control of their major health care decisions

an HSA paired with an HDHP can be an excellent choice.

However, the concepts presented in this article are meant for educational purposes only and are not intended as personal advice informed by your specific circumstances. Before making a decision regarding your medical insurance and investment plan, consult with a medical insurance specialist and an experienced CFP® professional.

Ready to Talk to a CFP® About Your HSA?

Our CFP® professionals at Financial Plan work with individuals and families across Washington State to build tax-smart retirement and healthcare strategies. Schedule a consultation with our Bellingham office today.