Tax-deductible contributions
Contributions to an HSA are deductible above the line — they reduce your adjusted gross income whether you itemize or not. Employer contributions are excluded from income entirely.
Tax-deferred growth
HSA funds invested in stocks, bonds, or mutual funds grow tax-deferred inside the account. No annual tax on dividends, interest, or capital gains — same treatment as an IRA.
Tax-free withdrawals
Withdrawals for qualified medical expenses are completely tax-free — no income tax, at any age. This is the key advantage over a traditional IRA, where all withdrawals are taxable.
Eligibility — who can contribute to an HSA
You must be enrolled in a High Deductible Health Plan (HDHP): In 2024, an HDHP has a minimum deductible of $1,600 (individual) or $3,200 (family) and maximum out-of-pocket of $8,050 (individual) or $16,100 (family).
You cannot be enrolled in Medicare: Once you enroll in Medicare Part A or Part B, you can no longer make new HSA contributions. You can still spend existing HSA funds tax-free.
You cannot be claimed as a dependent: If someone else claims you as a dependent on their tax return, you are ineligible to contribute.
Strategy 1 — Pay medical expenses out of pocket, let HSA invest and grow
The most powerful HSA retirement strategy: contribute the maximum each year, invest the funds in low-cost index funds, and pay all current medical expenses out of pocket. You can reimburse yourself from the HSA for any qualified medical expense at any time in the future — there is no time limit on reimbursements, only that the expense occurred after the HSA was established. A $10,000 medical expense paid out of pocket today can be reimbursed tax-free from your HSA in 20 years — after decades of tax-free compounding.
Strategy 2 — After age 65, use HSA as a traditional IRA for any expense
After age 65, HSA withdrawals for any purpose — not just medical — are taxable as ordinary income but not subject to the 20% penalty. This makes the HSA function identically to a traditional IRA for non-medical expenses after 65. But unlike a traditional IRA, withdrawals for qualified medical expenses remain completely tax-free. The HSA is therefore strictly superior to a traditional IRA for those who qualify — it has all the same flexibility after 65, plus the permanent medical expense advantage.
Strategy 3 — Use HSA to pay Medicare premiums tax-free
After age 65, HSA funds can be used tax-free to pay Medicare Part B, Medicare Part D, Medicare Advantage, and long-term care insurance premiums (subject to IRS limits). For retirees paying $2,000–$5,000+ per year in Medicare premiums, using HSA funds eliminates that cost entirely — a significant annual tax saving.
| Factor | Traditional IRA | Roth IRA | HSA |
|---|---|---|---|
| Contribution deductible | May be deductible | Not deductible | ✓ Always deductible |
| Tax-free growth | No — tax-deferred | ✓ Tax-free | ✓ Tax-free |
| Tax-free withdrawals | No — all ordinary income | Qualified only | ✓ For all medical expenses |
| RMDs | Age 73 or 75 | None | None |
| Eligibility requirement | Earned income | Income limit applies | Must have HDHP — no income limit |
| Non-medical after 65 | Ordinary income — same as IRA | Tax-free | Ordinary income — same as IRA |
| Medicare premiums | Can pay with distributions (taxable) | Can pay with distributions (tax-free) | ✓ Tax-free directly |
Keep your receipts — forever
There is no time limit on reimbursing yourself from an HSA for past qualified medical expenses — as long as the expense occurred after the HSA was established. A qualified medical expense paid in 2024 can be reimbursed tax-free from your HSA in 2040 — after 16 years of tax-free compounding on those funds. Keep every medical receipt in a dedicated folder from the day you open your HSA. This documentation is your proof of reimbursability for the IRS.