HSA vs FSA: What Is the Difference?

November 5, 2026 Invest Clarity Path Team

When you pick a health plan at work, you may see two sets of letters: HSA and FSA. They look alike, and both help pay for health costs, but they are not the same. One stays with you, and the other is tied to your job. This guide explains both accounts in plain words, so you can see the difference before open enrollment ends.

The short answer

An HSA and an FSA help pay for health costs, but they work in different ways. An HSA goes with a high deductible health plan, belongs to the person, and money rolls over each year. An FSA comes through an employer, and most money must be used in that year. Your health plan and job shape the choice.

What is an HSA?

An HSA is a Health Savings Account. You can only open and use one if you have a high deductible health plan, which is often called an HDHP. A high deductible plan has a higher amount you must pay for care before the plan starts to pay, and the IRS sets the minimum deductible each year. If your plan is not an HDHP, you cannot use an HSA, even if you want one.

The HSA belongs to the person, not to the employer. The money in it is yours, and it stays yours if you change jobs or leave work. The money rolls over from year to year, so you do not lose it at the end of December. You can use the money to pay for qualified medical costs, such as doctor visits, prescriptions, and other care the IRS lists as qualified.

Many HSAs also let you invest the money, in general terms, once your balance is above the level the provider sets. That means the money can grow over time, but it can also fall in value.

What is an FSA?

An FSA is a Flexible Spending Account. It comes through an employer, as part of a plan at work. The employer owns the arrangement, and the worker takes part through that employer plan. You cannot open an FSA on your own in the same way you can open a bank account. If your employer does not offer one, you cannot have one.

An FSA can also be used to pay for medical costs, such as doctor visits, dental care, eye care, and prescriptions, when the plan allows it. There is also a dependent care version of an FSA, which can help pay for childcare costs, in brief, such as care for a child while a parent works. The rules for what counts are set by the plan, so a worker should check the plan list before they spend.

The main point to know about an FSA is that it is mostly use it or lose it. Money that is not used by the end of the plan year is normally lost, although some plans let a small amount roll over to the next year, and some plans give a short grace period to use the money after the year ends. The plan, not the worker, sets those rules, so they are not the same at every employer.

HSA and FSA side by side

Point	HSA	FSA
Needs a high deductible plan	Yes	No
Who owns it	The person	The employer arrangement
Money rolls over	Yes, year to year	Mostly no, with a small rollover or grace period in some plans
Can be invested	Yes, in general terms	No
Use for medical costs	Yes, qualified costs	Yes, when the plan allows it

The table shows the key trade off. An HSA gives you more control and more time, but you must have the right health plan to use it. An FSA is open to more health plans, but it gives you less time to use the money, and it is tied to your employer.

The limits the IRS sets each year

The IRS sets the limits for both accounts each year, and the limits can change. For 2026, IRS Publication 969 says the HSA contribution limit is $4,400 for a person with self only coverage under a high deductible health plan, and $8,750 for family coverage. Those amounts are set by the IRS, not by the employer.

For an FSA, IRS Publication 969 says that for 2025, the salary reduction limit was $3,300, and the maximum carryover amount for a health FSA was $660. That carryover is the most that could roll over in a plan that allowed it. A worker should check the IRS figure for the current year, and the limit their own plan sets, because a plan can set a lower limit than the IRS allows.

What happens when you change jobs

Changing jobs is where the two accounts are most different. An HSA belongs to you, so it goes with you. You keep the account and the money in it, and you can still use it to pay for qualified medical costs after you leave a job. You may need to move it to a new HSA provider, and you should check the fees and choices before you move it.

An FSA is different. When you leave a job, the FSA normally ends with that job, and you may lose the money that is left in it, unless the plan gives you a short time to use it or a way to keep it through a plan rule. This is why a worker should use FSA money with care when a job change is likely.

How open enrollment forces the choice

Open enrollment is the short time each year when a worker picks a health plan and a savings account for the next year. It forces the choice, because you cannot wait until you are sick to pick a lower cost plan or to start to save. You must pick in advance, and you cannot change the choice until the next open enrollment, unless a life event gives you a special chance to change it.

During open enrollment, a worker should look at three things. First, what health plan is on offer, and is it a high deductible plan that allows an HSA? Second, what costs are likely next year, for doctor visits, medicines, dental care, or childcare? Third, how much money can be set aside from pay, and what happens to money that is not used?

Worked example: putting $600 in each account

Example only. This is a made up example to show what happens at year end. It is not a real person, and it is not advice for any one worker. The numbers are round on purpose, so the maths is easy to follow.

Take a worker who puts $600 a year into an HSA and, in a different year, $600 a year into an FSA. Both are $50 a month for 12 months. In the example, the worker spends $400 on qualified medical costs during the year, and has $200 left in each account at year end.

With the HSA, the $200 left over rolls over to the next year. The worker starts the next year with $200 already saved, and can add more. With the FSA, the $200 left over is mostly lost at year end, unless the plan lets a small amount roll over, or gives a grace period. If the plan lets $200 roll over, the worker keeps it, but if the plan does not allow it, the worker loses it. This shows why the amount put into an FSA needs more care and a good guess at the costs for the year.

Things to check before you choose

Check if your health plan is a high deductible health plan that allows an HSA.
Check if your employer offers an FSA, and what costs it covers.
Check the rollover and grace period rules for any FSA on offer.
Check the IRS limit for the year, and the limit your plan sets.
Check what happens to each account if you leave your job.

Quick answers

Can I have both an HSA and an FSA?

In general, you cannot have a full HSA and a full health FSA at the same time, because the FSA can pay for costs before you meet the high deductible. Some employers offer a limited purpose FSA with an HSA for dental and eye care only, so check your plan rules.

Does HSA money roll over to the next year?

Yes. HSA money rolls over year to year, and the account belongs to you. The money stays yours if you change jobs, and you can use it later for qualified medical costs.

What happens to FSA money I do not use?

FSA money is mostly use it or lose it. Money not used by the end of the plan year is normally lost, although some plans let a small amount roll over, up to $660 for 2025, or give a short grace period. Check your plan for the exact rule.

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