Open enrollment season is here, and millions of Americans are staring at a benefits form with two confusing acronyms: FSA and HSA.
Pick the wrong one and you could leave hundreds of dollars on the table — or worse, forfeit money you already earned.
Both accounts let you pay for doctor visits, prescriptions, and glasses with pre-tax dollars.
The difference comes down to who controls the cash and what happens when the year ends.
An FSA, or flexible spending account, is typically use-it-or-lose-it.
An HSA, or health savings account, rolls over year after year and can even be invested.
Here's the catch with the FSA: you usually have to spend the balance by December 31, though some employers offer a grace period or let you carry over a small amount.
In 2024, workers with an FSA can contribute up to $3,200.
If you guess wrong and don't spend it, that money goes back to your employer.
Roughly $300 million in FSA funds gets forfeited every year, according to estimates from benefits administrators.
The HSA works differently, but not everyone qualifies.
You can only open one if you're enrolled in a high-deductible health plan, which means your deductible is at least $1,600 for individual coverage in 2024.
Contributions max out at $4,150 for singles and $8,300 for families.
Your employer often chips in too, and the money stays yours even if you change jobs.
The HSA also comes with a triple tax advantage: contributions go in pre-tax, growth is tax-free, and withdrawals for qualified medical expenses aren't taxed.
After age 65, you can use the funds for anything without a penalty, though non-medical withdrawals get taxed like regular income.
Some people treat it as a stealth retirement account.
If you have a high-deductible plan and can afford to set money aside, the HSA is usually the stronger play.
It follows you, it grows, and it doesn't expire.
If you don't qualify for an HSA but know you'll have predictable costs — say, regular prescriptions or a planned procedure — a limited-purpose FSA can still shave your tax bill.
One practical move: estimate your medical spending before you enroll.
Pull last year's receipts, add up copays and dental work, then round down.
With an FSA, underfunding is safer than overfunding.
With an HSA, contributing the max early in the year gives your money more time to grow.
A quick note on receipts: the IRS can ask for proof, so keep documentation for every purchase.
If you're audited and can't show the expense was medical, you'll owe taxes plus a 20% penalty on HSA withdrawals.
The bottom line is that these accounts reward people who plan ahead.
The tax savings are real money — often several hundred dollars a year — but they only show up if you match the account to your actual health costs and your tolerance for paperwork.
My take: if you're healthy and have a high-deductible plan, fund the HSA and forget about it until retirement.
If your plan doesn't qualify, use the FSA but treat the balance like a deadline, not a savings account.
Final Thoughts
Either way, don't let the acronyms scare you into skipping free money.