HSA vs FSA: Use Your Money Before Year-End

December is when health accounts quietly cost people money. FSA balances go unspent, HSA contributions get forgotten, and receipts sit in a drawer. This HSA vs FSA guide explains how the two accounts differ at year-end, what happens to money you do not use, and the few simple moves to make before 31 December.

A smiling pharmacist reaching for a medicine box on a well-stocked pharmacy shelf — A December trip to the pharmacy can be a smart way to use FSA money before it expires.

Key takeaways

HSA money is yours to keep: it rolls over every year and moves with you when you change jobs.
FSA money is generally use-it-or-lose-it, although some plans offer a small carryover or a grace period, never both.
You can still make 2026 HSA contributions until the tax filing deadline, 15 April 2027.
Check your FSA balance and your plan's year-end rules now, then book care or buy eligible supplies while there is time.

Both accounts let you pay for medical costs with pre-tax money, which is why they are so popular. But they behave very differently when the calendar runs out. One is a long-term savings pot. The other is a yearly budget with a deadline. Mixing them up is how people lose money in December.

This guide is general information, not tax, medical or financial advice. Plan rules differ from employer to employer, so read your own plan documents and speak with your benefits team or a tax professional about your situation.

HSA vs FSA: the quick difference

Here is the short version before we go deeper.

Health savings account (HSA). Available only if you are covered by an HSA-qualified high deductible health plan (HDHP). The money is yours, it rolls over every year, and it stays with you if you leave your job.
Health flexible spending account (FSA). Set up through an employer. You choose an amount for the plan year, and it is generally use-it-or-lose-it. Your plan may let a limited amount roll into next year or give you a few extra months to spend it, but some plans offer neither.
Dependent care FSA. A separate account for childcare and similar costs, not medical bills. Its limit is $7,500 per household from 2026.

So at year-end, the question is different for each. For an FSA, it is "how do I use this before I lose it?" For an HSA, it is "have I put in as much as I want to, and am I keeping my receipts?"

Your FSA at year-end: use it or lose it

The 2026 health FSA limit is $3,400. If you elected a large amount in January and have not used much of it, now is the time to check.

Know your plan's rule

Every FSA plan follows one of three patterns. Find out which one applies to you, because it changes your deadline.

Carryover. The plan lets you roll a limited amount into next year. For 2026 plan years, the carryover into 2027 can be up to $680. Anything above that is lost.
Grace period. The plan gives you up to 2.5 extra months after the plan year ends to spend the balance.
Neither. The plan year ends and any unused money is forfeited.

If your plan has a grace period, the extra months can be a real help, because you can book a dental or eye appointment for January or February and still use this year's money. If it has a carryover, think of anything above the carryover amount as money with a firm deadline.

A plan can offer a carryover or a grace period, not both. Your benefits portal or summary plan description will say which, and it should also tell you how long you have to submit claims for expenses you already paid.

$680 The most a health FSA plan with a carryover feature can let you roll from a 2026 plan year into 2027 IRS

Smart ways to use FSA money

Common eligible expenses include copays, prescriptions, glasses and contacts, dental work, and many over-the-counter medicines and supplies. With a few weeks left, think about:

Eye care. A new pair of glasses, prescription sunglasses or a supply of contact lenses.
Dental work. A cleaning or a treatment you have been putting off, if you can still get an appointment.
Prescription refills. Refill regular medicines where your plan and pharmacy allow it.
Everyday health supplies. Many over-the-counter medicines and first aid supplies are eligible. Check your plan's list before you buy.
Unclaimed receipts. Look for copays and pharmacy receipts from earlier in the year that you never submitted.

Common mistake

Stockpiling random items just to spend the balance. Buy things you would use anyway, and check eligibility first. If a purchase is not eligible, the claim can be denied and you may end up paying out of pocket after all.

Colorful pills spilling out of an orange prescription pill bottle onto a bright blue background — Prescriptions and many over-the-counter medicines are common FSA-eligible expenses.

Your HSA at year-end: top up and tidy up

An HSA has no use-it-or-lose-it rule, so there is no need to rush spending. Year-end is about contributions and records instead.

Check your contributions

For 2026, the HSA limits are $4,400 for self-only coverage and $8,750 for family coverage. For 2027, they rise to $4,500 and $9,000. If you are 55 or older, you can add a $1,000 catch-up contribution. These limits are set by the IRS and change each year, so check IRS.gov for updates.

The good news is that December is not your last chance for 2026. You can make HSA contributions for a tax year until the tax filing deadline, which is 15 April 2027 for 2026. If you contribute directly rather than through payroll, tell your HSA provider which year the deposit is for.

Keep your receipts

Many people pay medical bills out of pocket and leave their HSA invested or saved for later. Whatever you do, keep a clear record of each medical expense and how you paid it. A simple folder or spreadsheet does the job, and it makes any later claim straightforward.

Pro tip

Create one digital folder called "Health receipts 2026" and drop in a photo or PDF of every medical receipt, explanation of benefits and pharmacy slip. Name each file with the date and provider, such as "2026-11-04 dentist", so you can find it in seconds.

A year-end health account plan in five steps

Set aside 30 minutes this week and work through these steps in order.

Log in and check balances. Note your FSA balance, your HSA balance and how much you have contributed to the HSA so far in 2026.
Find your FSA rule. Carryover, grace period or neither, plus the claim submission deadline.
Submit old receipts. Claim any eligible expenses you already paid but never submitted.
Plan the rest. If there is FSA money left, book an eye or dental appointment or buy eligible supplies you will use.
Decide on HSA contributions. If you are under the limit and can afford it, plan an extra deposit before 15 April 2027, and note your 2027 contribution plan too.

A simple health account tracker template

Copy this into a spreadsheet to see everything at a glance. The amounts are made-up examples.

Account	Balance today (example)	Year-end rule	Key deadline	Planned action
Health FSA	$540	Carryover up to $680	Claims by plan deadline	New glasses, submit pharmacy receipts
HSA (self-only)	$2,900 contributed in 2026	Rolls over, no deadline to spend	2026 contributions by 15 April 2027	Add $500 more, file receipts
Dependent care FSA	$300	Check plan	Plan year end	Submit December childcare invoice

Hypothetical example

Imagine Elena, who works for a small design agency. In mid-December she logs in and finds $540 left in her health FSA. Her plan has a carryover, so up to $680 would roll into 2027 and she would not lose anything. Still, she submits $90 of pharmacy receipts she had forgotten and books an eye exam she needed anyway. She also realizes she has put only $2,900 into her HSA, so she plans an extra deposit in January, marked for 2026. (These numbers are made up for illustration.)

Planning ahead for 2027

Year-end is also the moment to set next year up better. If you lost FSA money this year, choose a smaller election next time, based on costs you are confident about, such as regular prescriptions or a planned dental treatment. If you ended the year with a big unspent HSA balance, that is fine, because it keeps growing for future medical costs.

As of late October 2026, the IRS had not yet announced the 2027 health FSA limit, so check your enrollment materials for the figure your plan uses. If you are still choosing a health plan for 2027 through HealthCare.gov, remember that in most HealthCare.gov states you need to enroll by 15 December 2026 for coverage starting 1 January 2027. Our open enrollment checklist covers that decision in detail.

In the UK, these accounts do not exist in the same form. The NHS covers residents, and private medical insurance is often an employer benefit that is usually taxable as a benefit in kind.

Your year-end HSA and FSA checklist

Check your health FSA balance and plan year end date
Confirm whether your plan has a carryover, a grace period or neither
Note the deadline for submitting claims
Submit any old receipts you have not claimed
Book care or buy eligible items you will actually use
Check your 2026 HSA contributions against the limit
Plan any extra HSA deposit before 15 April 2027
Save every receipt in one dated folder
Set your 2027 FSA election and HSA contribution plan

Frequently asked questions

Can I have an HSA and an FSA at the same time?

Generally, a standard health FSA can make you ineligible to contribute to an HSA. Some employers offer special limited FSAs designed to work alongside an HSA. Check with your benefits team before enrolling in both.

What happens to my HSA if I leave my job?

The money is yours and stays with you. You keep the account, and you can usually move it to another HSA provider if you prefer. Contributions depend on whether you still have HSA-eligible coverage.

Do I lose all my FSA money on 31 December?

Not always. If your plan has a carryover, up to $680 from a 2026 plan year can roll into 2027. If it has a grace period, you may have up to 2.5 more months to spend it. If it has neither, unused money is lost, so check your plan now.

The bottom line

An FSA is a yearly budget with a deadline, and an HSA is savings that stay with you. In December, focus your FSA energy on spending wisely and submitting claims, and focus your HSA energy on contributions and good records.

Take 30 minutes this week to check both balances, learn your plan's year-end rule and make a short list of eligible costs. That small effort keeps your money working for your health instead of disappearing on New Year's Day.