Open enrollment season is here, and millions of Americans are staring at two nearly identical-looking acronyms on their benefits paperwork: FSA and HSA.
Pick wrong and you could leave hundreds of dollars on the table — or worse, forfeit money you already set aside.
The difference comes down to three things: who owns the account, when you can use the cash, and whether it survives a job change.
A flexible spending account (FSA) is offered by your employer.
You decide how much to contribute for the year, and the money comes out of your paycheck before taxes.
The catch: it's a use-it-or-lose-it arrangement.
In 2024, you can roll over up to $640, or your employer may give you a grace period until March 15 of the following year.
Anything beyond that goes back to your boss.
A health savings account (HSA) works differently.
You can only open one if you're enrolled in a high-deductible health plan, which for 2024 means a deductible of at least $1,600 for self-only coverage or $3,200 for a family.
The trade-off is real, but so is the payoff.
HSA funds never expire, they follow you if you switch jobs, and you can invest the balance in index funds or mutual funds once you hit a certain threshold — often $1,000.
For 2024, the IRS lets you contribute up to $4,150 to an HSA if you have self-only coverage, or $8,300 for a family plan.
If you're 55 or older, you can add another $1,000.
FSA limits are lower: $3,200 per year per employer, though some companies offer a separate dependent care FSA with its own cap.
The tax treatment is nearly identical — both accounts let you pay for qualified medical expenses with pre-tax dollars.
But the HSA has a triple advantage: contributions go in tax-free, growth is tax-free, and withdrawals for medical costs are tax-free.
After age 65, you can pull money out for any reason without penalty, though you'll owe income tax on non-medical withdrawals.
That makes an HSA a stealth retirement account.
If you're healthy, have a high-deductible plan, and can afford to pay small medical bills out of pocket while letting the HSA grow, it's hard to beat.
If you're managing a chronic condition or expect predictable expenses like therapy, prescriptions, or glasses, an FSA lets you access the full annual amount on day one — a real advantage if you need care in January.
One more trap to watch: you generally can't contribute to an HSA if you're covered by a traditional FSA, including a spouse's.
Some employers offer a limited-purpose FSA that only covers dental and vision, which keeps your HSA eligibility intact.
The bottom line: run your own numbers before you click submit.
Estimate last year's medical spending, check your plan's deductible, and ask HR whether your FSA has a carryover or grace period.
My take: too many people default to whichever account loads first in the benefits portal and never revisit it.
Final Thoughts
Spend fifteen minutes with a calculator and your receipts from last year — that small effort can be worth several hundred dollars a year.