Using an HSA as a Supplementary Retirement Account

What is an HSA?

A Health Savings Account (HSA) is a tax-advantaged account designed to help you pay for medical, dental, and vision expenses. Contributions go in pre-tax (or are deductible from current-year income), the balance grows tax-free, and qualified medical withdrawals come out tax-free — a combination known as the triple tax advantage.

HSAs are easy to confuse with Flexible Spending Accounts (FSAs), but the differences matter:

• HSAs are owned by you. The account is yours regardless of employer or insurance plan. You take it with you when you change jobs, retire, or switch insurance.
• HSAs roll over indefinitely. Unspent balances stay in the account year over year and accumulate.
• HSAs can be invested. Most providers let you invest the balance in mutual funds or ETFs once it exceeds a small minimum. FSA balances earn nothing.
• FSAs are “use it or lose it.” Most FSA balances expire at year-end (some plans allow a small carryover or grace period).

The combination of tax treatment, portability, and the ability to invest is what makes an HSA much more powerful than an FSA — and what creates the retirement opportunity covered later in this guide.

The HDHP Requirement

To contribute to an HSA, you must be enrolled in a High-Deductible Health Plan (HDHP) that meets IRS minimum requirements (set annually) for both the deductible and out-of-pocket maximum. You also can’t be covered by other disqualifying insurance (like a general-purpose FSA, in most cases) or be enrolled in Medicare.

If you’re not on an HDHP for the full year, you can typically contribute proportionally for the months you were eligible. Your HR or benefits team can confirm whether your plan qualifies.

2026 Contribution Limits

For 2026, the annual contribution limits are:

• Self-only HDHP coverage: $4,400
• Family HDHP coverage: $8,750
• Catch-up contribution (age 55+): an additional $1,000

A few things to know about contributions:

• You have until the April tax filing deadline to contribute for the prior tax year (just like an IRA).
• Payroll contributions are even better than direct contributions. Money contributed through payroll deduction also avoids FICA payroll tax (7.65%), in addition to income tax. Direct contributions outside payroll are still deductible from income tax, but FICA still applies to those wages.
• You can also do a one-time, lifetime rollover from an IRA into an HSA — the Qualified HSA Funding Distribution. Of limited value in practice: the rollover is capped at that year’s HSA contribution limit ($4,400 or $8,750 in 2026), AND it counts as your annual contribution for that year, so you can’t stack it on top of a regular contribution.

The Triple Tax Advantage

What makes an HSA uniquely powerful is that money receives favorable tax treatment at every stage:

1. Going in: Contributions are pre-tax (or deductible). You don’t pay income tax on the dollars you contribute.
2. While in the account: Investment growth — interest, dividends, capital gains — accumulates tax-free.
3. Coming out (for qualified medical expenses): Withdrawals to pay for medical, dental, or vision expenses are tax-free.

No other tax-advantaged account offers all three. Traditional 401(k)s and IRAs are pre-tax going in but ordinary-income-taxed coming out. Roth accounts are after-tax going in but tax-free coming out. Only HSAs are tax-free at all three points — making each dollar contributed disproportionately valuable.

The Normal Way to Use an HSA

The straightforward use of an HSA: contribute money via payroll or direct deposit, then spend or reimburse yourself for qualified medical, dental, or vision expenses (your own, your spouse’s, or your dependents’ — even if they’re not on your insurance plan).

Examples of qualified expenses include doctor visits, prescriptions, dental work, eyeglasses, contact lenses, mental-health care, certain over-the-counter medications, and many others. The IRS publishes the official list (Publication 502).

Used this way, the HSA is essentially a tax-free piggy bank for healthcare costs.

Withdrawing for Non-Medical Expenses

You can also withdraw HSA funds for non-medical reasons. The tax treatment depends on your age:

• Before age 65: Non-medical withdrawals are subject to ordinary income tax plus a 20% penalty.
• At age 65 or later: Non-medical withdrawals are taxed as ordinary income, but the 20% penalty disappears.

After 65, an HSA functions essentially like a Traditional 401(k) or IRA: pre-tax money comes out, gets taxed as ordinary income, and there’s no penalty. (Qualified medical withdrawals remain tax-free at any age.)

The Strategy: HSA as a Stealth Retirement Account

Here’s where the HSA gets interesting for high earners thinking about retirement.

The default advice is to spend HSA dollars on current medical expenses as they come up. But if you can afford to pay your medical expenses out of pocket with after-tax dollars from your regular cash flow, you can leave the HSA balance untouched — and let it grow, invested, for decades.

Three things make this strategy powerful:

1. You can reimburse yourself anytime — even years later

There’s no time limit on reimbursing yourself for past medical expenses, as long as the expense was incurred after you opened the HSA. You can pay a $500 medical bill in 2026 with your credit card, save the receipt, and reimburse yourself tax-free from the HSA in 2046 — by which time those dollars (still in the HSA) may have multiplied many times over.

The catch: you have to keep records. You’ll need to be able to substantiate, if audited, that the reimbursement was for a qualified expense incurred after the HSA was opened. Some HSA custodians — including Lively — have built tools specifically for this, letting you upload and store receipts within the account for future reimbursement. Without those records, the strategy falls apart.

2. The balance grows tax-free if invested

For this strategy to work, the HSA balance has to actually grow — which means the money needs to be invested, not sitting in cash. Most HSA custodians offer a brokerage option once the balance exceeds a small threshold (often $1,000–$2,000), letting you invest in mutual funds or ETFs. Decades of tax-free growth is what turns a modest annual contribution into a meaningful retirement balance.

3. After 65, you have full flexibility

Once you turn 65, the 20% penalty on non-medical withdrawals disappears. From that point, the HSA functions as either:

• A tax-free reimbursement account for any qualified medical expenses you incurred after opening the HSA (using your stored receipts), or
• A pre-tax retirement account, where withdrawals for any purpose are taxed as ordinary income — exactly like a Traditional 401(k) or IRA

This optionality is what makes the HSA a hedge: if you turn out to have low medical costs in retirement, you simply use the balance like a 401(k). If you have high medical costs, you cover them tax-free.

Why This Matters for High Earners

For someone already maxing out their 401(k) employee deferral, employer match, and (where available) the Mega Backdoor Roth, the HSA may be the next-most-tax-efficient bucket of capacity. The annual contribution limit is small relative to a 401(k), but the triple tax advantage means each HSA dollar is uniquely valuable.

Treated as a long-term, invested retirement vehicle — and combined with paying current medical expenses out of pocket — an HSA effectively adds another tax-sheltered retirement account on top of everything else, without using up any 401(k) or IRA capacity.

This dovetails with the broader strategy of shifting taxable savings into tax-advantaged accounts: the HSA is one more bucket to fill.

Practical Considerations

A few details that matter when you’re using an HSA for retirement:

Medicare cuts off contributions

Once you enroll in Medicare (typically at age 65), you can no longer contribute to an HSA. You can still spend the existing balance — for medical expenses tax-free, or for other purposes subject to ordinary income tax (no penalty). Some people delay Medicare enrollment specifically to keep contributing for an extra year or two; whether that’s wise depends on your overall coverage situation.

Portability

Your HSA goes with you when you change employers or HDHP plans. You can also transfer or roll the balance to a different HSA custodian if you find one with better investment options or lower fees.

Inheritance

A spouse who inherits your HSA can continue to use it as their own HSA. A non-spouse beneficiary cannot — the HSA terminates and the balance is treated as ordinary income to them in the year of death. For estate-planning purposes, an HSA isn’t a great asset to leave to non-spouse heirs.

Investment options vary widely

Not all HSA custodians offer a robust set of investment options or low expense ratios. If you’re using the HSA as a long-term retirement vehicle, the difference between a custodian with broad index-fund access and one that only offers mediocre proprietary funds can be material over decades.

State tax treatment

Most states conform to the federal tax treatment of HSAs — your contributions are deductible at the state level, and growth and qualified withdrawals are state-tax-free. California and New Jersey are notable exceptions: they do not recognize HSAs for state income tax purposes, meaning contributions aren’t deductible on your state return and investment gains inside the HSA are state-taxable each year. If you live in one of those states, the HSA is still a strong federal-tax vehicle but loses one layer of the triple tax advantage.

The Takeaway

An HSA is the only account in the U.S. tax code that offers tax-free treatment going in, growing, and coming out (for qualified medical expenses). For high earners who can afford to pay current medical costs out of pocket, leaving the HSA untouched and invested for decades turns it into a stealth retirement account: tax-free withdrawals later for documented medical expenses, or 401(k)-style ordinary-income withdrawals for any purpose after age 65. Combined with maxing out other tax-advantaged accounts, this strategy adds meaningful additional retirement capacity — but only if you keep careful records of medical expenses and actually invest the balance for the long haul.