The Long-Term Value of an HSA: Why It Is More Than a Medical Spending Account

How Most People Use Their HSA

A common approach to Health Savings Accounts is to use them as a spending account for medical expenses as they come up. Co-pay at the doctor, new glasses, a prescription refill -- the HSA card covers it, the money came out pre-tax, and the transaction feels efficient.

That approach works, and there is nothing wrong with it. But it does leave something on the table. The HSA is the only account in the tax code that offers three separate tax advantages at once: contributions are tax-deductible, the money grows tax-free, and withdrawals for qualified medical expenses are tax-free. No 401(k), IRA, or Roth account combines all three. When HSA funds are spent shortly after being contributed, the growth component of that triple benefit never has a chance to take effect.

What Happens When HSA Funds Stay Invested

To illustrate the impact of leaving HSA money untouched, consider a simple example. If $2,400 per year is contributed and spent immediately, the account balance stays near zero. If that same $2,400 is contributed and invested instead -- left to grow at a hypothetical 7% average annual return -- the balance after 20 years would be roughly $105,000. After 30 years, closer to $240,000. All of it remains available for tax-free withdrawal when used for qualified medical expenses.

This is not a recommendation to avoid using HSA funds for current expenses. For many people, using the HSA for immediate costs is the practical choice. The point is simply that the account has a compounding feature that distinguishes it from most other spending tools, and understanding that feature helps people make informed decisions about how they want to use it.

How HSAs and FSAs Serve Different Roles

A Flexible Spending Account and a Health Savings Account are often mentioned together, but they work differently in important ways. FSA funds generally must be used within the plan year or they are forfeited (some employers allow a small carryover of up to $680 or a short grace period). FSAs cannot be invested. The account belongs to the employer, not the individual -- if someone leaves their job, unused FSA funds typically do not follow them.

An HSA, by contrast, has no expiration. Funds roll over every year, the account is individually owned, and most HSA providers offer investment options. Because of the use-it-or-lose-it nature of an FSA, it tends to function as a short-term spending tool for predictable expenses. The HSA can serve that same function, but it also has characteristics that lend themselves to longer-term accumulation.

For individuals who have access to both a Limited Purpose FSA (which covers dental and vision) and an HSA, the two accounts can serve complementary purposes -- one for near-term spending and one for longer-term growth. Not all employers offer both, so availability varies.

The Receipt Reimbursement Concept

One lesser-known feature of HSAs is that there is no time limit on reimbursements. If a qualified medical expense is paid out of pocket today and the receipt is saved, the HSA owner can reimburse themselves from the account at any point in the future -- five, ten, or twenty years later. The IRS requires only that the expense was incurred after the HSA was established and that it qualifies.

In practice, this means someone could pay medical bills from their regular checking account, keep documentation of those expenses, and allow their HSA balance to remain invested. At a later date -- whether in a year or in retirement -- those saved receipts can be submitted and the funds withdrawn tax-free, regardless of how much time has passed.

This approach requires record-keeping discipline. Receipts need to show the date of service, the provider, and the amount paid. A photo saved to a dedicated folder or a simple spreadsheet tracking expenses over time is typically sufficient. Whether this approach makes sense depends on individual cash flow, comfort level, and how much flexibility someone wants to maintain in how they use their HSA down the road.

HSA Balances Over Time: A Hypothetical Illustration

Using the 2026 individual contribution limit of $4,400 per year and assuming a hypothetical 7% average annual return with no withdrawals:

After 15 years: Roughly $110,000

After 25 years: Roughly $275,000

After 35 years: Roughly $580,000

For context, widely cited industry estimates suggest that the average retired couple may need $315,000 to $345,000 to cover healthcare expenses in retirement. These are rough benchmarks -- actual costs vary significantly based on health, location, insurance choices, and longevity.

After age 65, HSA funds can be withdrawn for any purpose without penalty. Non-medical withdrawals are taxed as ordinary income (similar to a traditional IRA distribution), while medical withdrawals remain tax-free. Unlike 401(k) and traditional IRA accounts, HSAs are not subject to Required Minimum Distributions at any age.

Key Takeaway

The HSA is a flexible tool that can serve as both a medical spending account and a long-term savings vehicle. How someone chooses to use it depends on their financial situation, health needs, and time horizon. Understanding the full range of what the account offers -- especially the compounding and reimbursement features -- puts people in a better position to decide what approach works for them.