Most people treat an HSA like a debit card for the pharmacy. Used that way it's fine. Used as an investment account, it's the only account I know of that skips tax three times: going in, while it grows, and coming out for medical costs.
It's open enrollment season, which is the one time a year most people can switch into a plan that allows one.
What an HSA is
A Health Savings Account is a savings and investment account paired with a high-deductible health plan. The money belongs to the account holder, not the employer. It rolls over every year and stays put after a job change.
That's the big difference from an FSA (Flexible Spending Account). FSA money is mostly use-it-or-lose-it each year, and it usually stays with the employer.
The main types of health plans
- HMO (Health Maintenance Organization): in-network only, and a primary care doctor refers to specialists. Lower premiums, less choice.
- PPO (Preferred Provider Organization): in-network or out-of-network at a higher cost, with no referrals. More choice, higher premiums.
- EPO (Exclusive Provider Organization): in-network only, with no referrals. In between an HMO and a PPO.
- POS (Point of Service): in-network with referrals, plus some out-of-network coverage. A mix of HMO and PPO.
- HDHP (High-Deductible Health Plan): can use any of the networks above. Lower premiums and a higher deductible, and the only type that allows an HSA.
On the ACA (Affordable Care Act) Marketplace, plans are also sorted into metal tiers: Bronze, Silver, Gold and Platinum. Bronze has the lowest premiums and the highest costs at the doctor.
Why someone picks a high-deductible plan with an HSA
- Lower premiums. Less comes out of every paycheck, and the difference can go into the HSA.
- Few expected medical bills. For someone healthy, the high deductible may never come into play.
- Employer money. Many employers put money into the HSA for employees on the high-deductible plan.
- The tax breaks, covered below.
It's a worse fit for someone with a chronic condition, a planned surgery or a baby on the way, or without cash set aside to cover the deductible. For 2026, out-of-pocket costs on an HSA-eligible plan are capped at $8,500 for self-only coverage and $17,000 for family coverage.
Who can have one
An HSA needs an HSA-eligible health plan, usually a high-deductible plan. For 2026 that means a deductible of at least $1,700 for self-only coverage or $3,400 for family coverage. New for 2026, Bronze and Catastrophic plans bought through an ACA exchange count too.
Contributions stop once Medicare starts.
The three tax breaks
- 401(k) or traditional IRA: pre-tax in, tax-deferred growth, taxed coming out.
- Roth IRA: after-tax in, tax-free growth, tax-free coming out (qualified withdrawals).
- HSA: pre-tax in, tax-free growth, tax-free coming out for medical costs.
Through payroll, HSA contributions also skip Social Security and Medicare tax. A 401(k) contribution doesn't.
The 2026 limits are $4,400 for self-only coverage and $8,750 for family coverage, plus $1,000 more at 55 and older.
Using it as a retirement account
This is how the account gets big:
- Contribute as much as the budget allows, ideally the limit.
- Invest the balance in low-cost index funds instead of leaving it in cash. Many HSAs require a small cash minimum first.
- Pay today's medical bills from regular cash flow when possible, and keep the receipts.
- Reimburse those bills later, even years later. Any expense after the HSA was opened counts.
$4,400 a year for 30 years at 7% after inflation is about $447,000 in today's dollars, before fees.
After 65, money can come out for any reason without a penalty. Non-medical withdrawals are taxed like a traditional IRA. Medical withdrawals stay tax-free. Before 65, a non-medical withdrawal is taxed plus a 20% penalty.
The trade-offs
- A higher deductible means more out-of-pocket cost in a year with big medical bills. The HSA only pays off if the cash is there to cover that.
- Some HSA providers charge fees or offer weak fund choices. The money can be moved to a better provider.
- Contributions have to stop 6 months before signing up for Medicare or Social Security after 65, because Part A can be backdated. More in Medicare Basics.