How to Use a Health Savings Account (HSA) to Save Money and Build Wealth

The HSA is one of the most powerful financial accounts available — and one of the most misunderstood. Here's how to use it to cut your tax bill, cover healthcare costs, and build long-term wealth.

If you have access to a Health Savings Account (HSA) and you're not maxing it out every year, you're leaving one of the best financial tools in the U.S. tax code completely untouched.

The HSA isn't just a medical expense account. Used strategically, it's a triple-tax-advantaged wealth-building vehicle that outperforms a traditional IRA or 401(k) for people who know how to use it.

1. What Is an HSA and Who Qualifies?

A Health Savings Account (HSA) is a tax-advantaged account you can use to pay for qualified medical expenses. But it's also one of the best retirement accounts available — if you invest the funds rather than spending them immediately.

To open and contribute to an HSA, you must:

Be enrolled in a High-Deductible Health Plan (HDHP) — in 2025, that means a minimum deductible of $1,650 for individuals or $3,300 for families
Not be enrolled in Medicare
Not be claimed as a dependent on someone else's tax return

2025 contribution limits:

Individual: $4,300/year
Family: $8,550/year
Age 55+: add $1,000 catch-up contribution

If your employer offers an HDHP option, check whether they contribute to your HSA as well — many employers add $500–$1,500/year to your account as an incentive.

2. The Triple Tax Advantage (and Why It's Unmatched)

No other account in the U.S. tax code does all three of these simultaneously:

Contributions are tax-deductible — Money you contribute reduces your taxable income. A $4,300 HSA contribution in the 22% tax bracket saves you $946 in federal taxes.
Growth is completely tax-free — Any investments inside your HSA grow without triggering capital gains or dividend taxes.
Qualified withdrawals are tax-free — When you use HSA funds to pay for medical expenses (at any point in your life), there's no tax on withdrawal.

Compare this to a Roth IRA: contributions are taxed, growth is tax-free, qualified withdrawals are tax-free. That's only two of the three advantages.

The HSA hits all three. For healthcare expenses — which every retiree will have — it's the most tax-efficient account available.

3. How to Invest Your HSA (Most People Don't)

Most people park their HSA in cash and drain it annually for doctor's visits. This is the worst way to use it.

Here's the better approach:

Step 1: Switch to the best HSA provider. If your employer's HSA has high fees or limited investment options, you can open a separate HSA at Fidelity (the best option — no fees, no minimum to invest, access to index funds) or Lively.

Step 2: Invest in low-cost index funds. Once your balance exceeds the minimum threshold (often $0–$1,000 depending on the provider), invest in a total market index fund. Treat it like your Roth IRA.

Step 3: Don't withdraw for current expenses if you can afford not to. Pay current medical bills out of pocket and let your HSA compound tax-free. Save every receipt — there's no time limit to reimburse yourself later.

A $4,000/year HSA contribution invested in a low-cost index fund for 25 years at 7% average return grows to approximately $270,000 — completely tax-free when used for medical expenses.

4. The "Receipt Shoebox" Strategy

This is the advanced move that turns an HSA into a tax-free piggy bank:

Pay all medical expenses out of pocket (if you can financially manage it)
Save every qualifying receipt — doctor's visits, prescriptions, dental, vision, therapy, and hundreds of other IRS-approved expenses
Let the HSA investments compound for years or decades
Reimburse yourself any time in the future — even 20 years later — with no taxes, no penalty

The IRS doesn't require you to take reimbursements in the same year as the expense. As long as the expense was incurred after you opened the HSA, you can reimburse yourself at any time.

This strategy effectively creates a pool of tax-free spending power you can access whenever you need it.

5. The HSA in Retirement

After age 65, the HSA becomes a bonus Traditional IRA:

Medical expenses: Still 100% tax-free
Non-medical expenses: Taxed as ordinary income, but no penalty — exactly like a Traditional IRA withdrawal

Given that the average couple retiring today needs an estimated $315,000 for healthcare costs in retirement (Fidelity, 2024), a fully funded HSA is one of the most targeted retirement assets you can build.

HSA funds can pay for:

Medicare Part B and D premiums
Long-term care insurance premiums
Dental and vision care
Most prescription medications and medical equipment

You'd have to spend this money anyway. The HSA just lets you spend pre-tax (or tax-free) dollars instead of after-tax dollars.

Start Using Your HSA Like a Retirement Account

If you have access to an HSA, the strategic sequence is:

Contribute enough to your 401(k) to capture the employer match
Max out your HSA
Max out your Roth IRA
Return to max out your 401(k)

The HSA sits at #2 in that order because its tax advantage is the broadest. Most people skip it entirely, leaving years of tax-free growth on the table.

Open a Fidelity HSA, automate your contributions, invest in index funds, and save your medical receipts. The payoff compounds for decades.