Simple definition
An HSA is a savings account for medical expenses, available only if you're enrolled in a qualifying high-deductible health plan. Contributions are tax-deductible, the money grows tax-free, and withdrawals for qualified medical costs are tax-free too. Unspent money rolls over year to year and the account stays yours if you change jobs.
Why it matters
It's the only common account with three separate tax advantages, and unlike an FSA the balance doesn't disappear at year end. If you're on a high-deductible plan, an HSA is the natural place to hold the cash you'd need to cover that deductible — the money is doing tax-advantaged work while it waits.
Real-life example
Your plan qualifies, so you contribute $150 a month pre-tax. You use some for prescriptions and a dental visit, paying with untaxed dollars. What's left rolls into next year rather than being forfeited, gradually building a cushion sized to your deductible.
Common mistakes
- Confusing an HSA with an FSA — FSA funds are generally use-it-or-lose-it, HSA funds roll over.
- Contributing while not enrolled in a qualifying high-deductible plan, which isn't allowed.
- Spending on non-qualified expenses, which triggers tax and, before retirement age, a penalty.
- Throwing away receipts, which are what substantiate a qualified withdrawal later.
Pro tips
- If your employer contributes to the HSA, that's part of your compensation — take it.
- Keep at least your deductible accessible in the account before considering anything else.
- Save receipts for qualified expenses; the records matter if a withdrawal is ever questioned.
- The account follows you between jobs — check the fees when deciding whether to move it.
Related Money Dictionary terms
- Flexible Spending Account (FSA)An employer account that lets you set aside pre-tax money for medical or dependent care costs within a plan year.
- Tax-Advantaged AccountAn account offering tax breaks on contributions, growth, or withdrawals to encourage saving for goals like retirement.
- Pre-Tax ContributionMoney put into an account before taxes are applied, lowering your taxable income now and taxed on withdrawal later.
- Tax DeductionAn expense you can subtract from your income to lower the amount that gets taxed.
- Tax DeferralDelaying taxes on money until a later date, letting it grow untaxed in the meantime inside certain accounts.
Frequently asked questions
Who can open an HSA?
You must be enrolled in a qualifying high-deductible health plan and generally can't be covered by other disqualifying coverage or claimed as someone's dependent. The specific plan requirements are set by the IRS and change over time.
What's the difference between an HSA and an FSA?
An HSA requires a high-deductible plan, rolls over indefinitely, and stays with you when you change jobs. An FSA is employer-owned, generally use-it-or-lose-it with limited carryover, and usually doesn't follow you out the door.
What happens to my HSA if I change jobs?
It's yours and it goes with you. You can keep using the existing balance for qualified expenses. You can only keep contributing while you're enrolled in a qualifying high-deductible plan.
Knowing what Health Savings Account (HSA) means is knowledge — the first half. A brick gets placed when you act on it: check whether your health plan qualifies for an HSA and whether your employer contributes.
Also builds: Workplace Benefits
Sources & references
More in Taxes
Plain-English education — not personalized legal, tax, or investment advice.