What Is an FSA? Employer Rules, Limits, and Setup
An FSA lets employees pay medical or dependent care costs pre-tax. What it costs an employer to offer one, current limits, and the mid-year risk.
Search this question and every answer you get is written for the employee: what a flexible spending account (FSA) pays for, whether the sunscreen counts, how to spend the balance before December. Here is the employer side, the answer I would give anyone asked to set one up: what an FSA commits your business to, what it costs, and how to run one without surprises.
Two things sit on your side of the table, and the consumer explainers skip both. The first: an employee's entire annual health FSA election has to be available on day one of the plan year, before they have contributed a cent of it, and if they spend it and quit, you cannot recover the difference. The second: money nobody claims stays with you.
There is also a change worth knowing about before your next enrollment. The dependent care ceiling moved from $5,000 to $7,500, the first permanent increase since that $5,000 figure was set in 1986, and it may not be automatic: a plan document that names $5,000 keeps that figure until somebody amends it.
I build the people and records tooling for businesses without an HR department at FirstHR. This is general information, not legal or tax advice, and cafeteria plan rules are technical enough that the plan document always wins over any summary, including this one.
What an FSA Actually Is
A flexible spending account is an employer-sponsored arrangement that lets an employee redirect part of their pay, before tax is calculated, to reimburse qualifying expenses. It exists only inside a written Section 125 cafeteria plan, which means the employer creates it, owns it, and is responsible for it. The Internal Revenue Service (IRS) describes the mechanics in Publication 969.
Three features of that definition do most of the work, and each one is a place where small employers get surprised.
It is not a savings account. Nothing accumulates, nothing earns interest, and there is no balance the employee has a property right in. That is the structural difference from a health savings account (HSA), and it explains almost every other rule that follows.
The election is annual and locked. An employee choosing $2,000 in November is committing to twenty-six deductions across the following year. They cannot stop it in March because they changed their mind, only because they had a qualifying change in status such as a marriage, a birth, or a change in employment. Explaining that clearly at enrollment prevents most of the friction that FSAs generate.
And it runs on pre-tax salary reduction, which is why both sides save. The employee avoids income tax and payroll tax on the amount. The employer avoids its share of FICA (Social Security and Medicare tax) on the same amount, at 7.65 percent, which is the part almost nobody mentions when they talk about the cost of offering one.
The Three Real Types, and the One That Is Not an FSA
An employer can realistically offer three flexible spending accounts: general purpose health, limited purpose health, and dependent care. The table adds a post-deductible variant of the health FSA, plus one very common thing that gets called an FSA and is not one, the commuter benefit. Getting that last one right saves you a conversation with a broker who quotes you the wrong product.
| Account | What it reimburses | Annual limit | Blocks HSA eligibility? |
|---|---|---|---|
| General purpose health FSA | Qualifying medical, dental, vision, and prescription costs for the employee, spouse, and dependents | $3,400 for plan years beginning in 2026 | Yes, for the employee and the spouse |
| Limited purpose health FSA | Dental, vision, and preventive care only | Same $3,400 limit | No, which is the entire point of it |
| Dependent care FSA | Day care, before and after school care, day camp, and care for a disabled adult dependent, so the employee can work | $7,500, or $3,750 filing separately | No |
| Post-deductible health FSA | Medical costs incurred after the minimum annual deductible for a high deductible health plan is met | Same $3,400 limit | No |
| Commuter benefit (not an FSA) | Transit passes, vanpool, and qualified parking | $340 per month for each in 2026 | No |
The commuter line is the one worth pausing on, because the phrase commuter FSA is everywhere and it describes something that is legally a different animal. Transit and parking benefits sit under Section 132(f) as qualified transportation fringe benefits, not under Section 125.
That different legal home has three practical consequences: the limit is monthly rather than annual, elections can usually be changed month to month rather than locked for a year, and unused amounts carry forward instead of being forfeited.
The limited purpose account is the other one small employers underuse. If you offer a high deductible health plan and anyone is contributing to a health savings account, a general purpose health FSA silently destroys their eligibility, and their spouse's too. A limited purpose version restricted to dental, vision, and preventive care gives them the pre-tax benefit without the collision.
Contribution Limits and What They Actually Cap
The health FSA limit is set by the IRS and adjusted for inflation each autumn. For plan years beginning in 2026 the salary reduction limit is $3,400 and the maximum carryover is $680, both from Revenue Procedure 2025-32. Two details in that sentence matter more than they look.
First, the limit attaches to the plan year, not the calendar year. A plan year running from July to June uses the limit in effect when that plan year began, which trips up employers with off-cycle plan years every single time the number changes.
Second, the limit is per employee, per employer, and it is a limit on salary reduction specifically. Two spouses working at different companies can each elect the full amount. Someone who changes jobs mid-year gets a fresh limit at the new employer, because the cap is not aggregated across unrelated employers the way a health savings account limit is.
The access figure above comes from the Bureau of Labor Statistics National Compensation Survey (March 2026), which found 47 percent of private industry workers had access to a healthcare flexible spending account, up from 40 percent in 2017.
Access at small establishments is materially lower. The same March 2026 survey puts it at 29 percent for private industry workers at establishments with fewer than 50 workers, against 78 percent at 500 or more. That gap is the honest context for a decision like this: offering one is a real differentiator in a small-company hiring market, not table stakes.
The Dependent Care Limit Went Up by Half, and It Is Optional
The dependent care FSA limit rose from $5,000 to $7,500, and from $2,500 to $3,750 for a married individual filing separately, effective for tax years beginning after December 31, 2025. It is now written into Section 129 of the tax code, amended by the tax legislation enacted on July 4, 2025.
The $5,000 figure it replaces had stood since 1986, interrupted only by a one-year pandemic increase for 2021. Four decades of a flat limit against child care costs that kept climbing are what make the jump feel as large as it does.
The part that matters operationally: the statute does not rewrite your plan. Federal law sets the ceiling, and your Section 125 plan document sets your actual limit. If the document says $5,000, your employees are capped at $5,000 no matter what the statute now permits, and the fix is a plan amendment rather than an announcement.
A plan document may also state its maximum as a method rather than a dollar figure, which the proposed cafeteria plan regulations allow. A document that ties the dependent care limit to the legal maximum moves with the statute, so read the actual wording before assuming either way.
That second question catches small businesses in a specific and predictable way. In a company of twelve where the two owners are the only people with the household income to justify electing $7,500 of child care through payroll, the average benefit for highly compensated employees runs far ahead of the average for everyone else. The test fails, and the consequence lands on the owners: their dependent care benefits become taxable income to them.
The fix is unglamorous and it has to happen before enrollment rather than after. Cap the election for highly compensated employees below the statutory maximum, or actively promote the benefit to the rest of the workforce so the average for everyone else rises. Testing in November, when the elections are already locked, means finding out in a payroll correction.
The wider cafeteria plan tests run alongside this one and have their own safe harbors, including one available to employers who averaged 100 or fewer employees in either of the two preceding years. Those tests apply to the cafeteria plan as a whole rather than to the dependent care account.
Use It or Lose It, and the Two Ways to Soften It
Money left in a health FSA at the end of the plan year is forfeited. That is the use-it-or-lose-it rule, the single most disliked feature of the product, and no plan can simply switch it off. What a plan can do is adopt one of two forms of relief, and only one.
| Relief option | What it does | The catch |
|---|---|---|
| Carryover | Moves up to $680 of what is unused at the end of a plan year beginning in 2026 into the following plan year, usable for the whole year | Cannot be combined with a grace period. Not available for dependent care FSAs. A general purpose carryover can block HSA eligibility for the next plan year |
| Grace period | Gives up to two and a half extra months after the plan year ends to incur new expenses against the old balance | Cannot be combined with a carryover. Generally blocks health savings account eligibility during the grace months |
| Run-out period | Extra time to submit claims for expenses already incurred during the plan year | Not relief at all. It extends the paperwork deadline, not the spending deadline, and is commonly confused with a grace period |
| Neither | Strict forfeiture at the plan year end | Legal and simple, and the version employees complain about |
For most small employers the carryover is the better of the two. It is simpler to explain than the older grace period, and it removes the December scramble that produces so much resentment.
Both options also affect health savings account eligibility. A grace period on a general purpose health FSA generally blocks health savings account contributions for its extra months. A carryover left in a general purpose health FSA blocks them for the whole following plan year, unless the plan moves it into a limited purpose or post-deductible account, or lets the employee decline it.
Whichever you pick, the communication matters more than the mechanism. Almost every complaint an employer hears about an FSA is really a complaint about a deadline nobody restated. Two reminders, one in October and one in early December, naming the exact date and the exact carryover amount, resolve most of it. They belong in your regular benefits communication rather than in a one-off email.
Can an Employer Refund Unused FSA Funds?
No, not as a refund of what any one person left behind. Forfeited amounts become what the proposed cafeteria plan regulations call an experience gain, and that gain belongs to the plan rather than to the participant. Three destinations are permitted for it, and refunding each employee their own unused balance is not among them.
The employer sponsoring the plan may retain the forfeitures, use them to defray the expenses of administering the plan, or allocate them among employees on a reasonable and uniform basis. That allocation can lower the following plan year's salary reductions or return the money to participants, but either way it is shared out uniformly, not handed back as each person's own leftover balance.
Two things follow for a small employer. The route your plan takes belongs in the plan document rather than in a decision made after the balances land. And an employee asking for their money back in December is really asking about the carryover or the grace period, the only two mechanisms that keep any of their own unused dollars in reach.
The Funding Rule That Puts You on the Hook
Here is the rule the consumer explainers never mention, because the risk it creates never lands on the employee. Under the uniform coverage rule in the proposed Treasury regulations governing cafeteria plans, an employee's full annual health FSA election must be available from the first day of the plan year. Not the amount they have contributed so far. The whole thing.
You cannot limit reimbursement to what has been withheld to date, you cannot accelerate the remaining deductions to catch up, and you cannot recover the shortfall from a departing employee's final paycheck. That is the deal the tax code strikes: in exchange for the pre-tax treatment, the arrangement has to shift real risk, and the risk shifts to the employer.
Two things keep this proportionate rather than alarming. Forfeitures run the other way and, across a normal workforce over a normal year, the two effects broadly offset. And the exposure is entirely within your control at the design stage, because it scales with the maximum election you permit. A plan capped at $1,500 has a maximum single-employee exposure of $1,500 minus whatever was withheld, which for a small company is a manageable number rather than a frightening one.
The dependent care account works completely differently. A dependent care FSA reimburses only up to what has actually been contributed, so the uniform coverage rule does not reach it. If that exposure is what is stopping you, a dependent care FSA on its own carries none of it.
What an FSA Actually Costs an Employer
The direct cost is an administration fee, and for a small business it is usually modest enough that the payroll tax saving covers it. The full picture has five lines, two of which run in your favor.
| Line item | Direction | How it behaves |
|---|---|---|
| Third-party administration fee | Cost | Typically a per-employee-per-month charge with a monthly minimum, plus a one-off setup fee and sometimes a debit card charge |
| Employer FICA saving | Saving | 7.65 percent of every dollar routed through salary reduction, which is why participation rate matters more than headcount |
| Uniform coverage shortfalls | Cost | Only on mid-year departures with overspent health FSAs. Bounded by your plan maximum, and zero for dependent care accounts |
| Forfeited balances | Saving | Unclaimed amounts stay with the plan and may be applied in the ways the plan document permits |
| Your own time | Cost | Enrollment communication, election changes, and the questions in the last week of the plan year |
The FICA line is the one to actually calculate before deciding. Ten participants averaging a $1,500 election is $15,000 of salary reduction, and 7.65 percent of that is roughly $1,150 a year of employer payroll tax you do not pay. Against a typical small-plan administration fee, that saving is frequently the difference between the benefit costing something and costing nothing. It changes the conversation from whether you can afford the plan to whether people will use it.
Participation is therefore the variable that decides the economics, and it is the one employers neglect. A plan nobody enrolls in generates no payroll tax saving and still charges the monthly minimum. That makes the enrollment explanation a financial decision rather than a nicety. Weigh the net cost of the plan against the rest of what you spend on benefits per employee.
Can the Employer Put Money In?
Yes, and there is a ceiling that has nothing to do with the $3,400 figure. A health FSA needs to qualify as an excepted benefit, the status that keeps it outside Affordable Care Act market rules. One of the conditions for that status is a cap on the maximum benefit relative to what the employee elected.
The maximum benefit payable for the year must not exceed two times the employee's salary reduction election, or, if greater, the employee's election plus $500. In practice that means you can contribute up to $500 regardless of what the employee elects, or match their election dollar for dollar, whichever produces more.
A $500 employer contribution is a genuinely good small-business move when it is used deliberately. It is small enough to be affordable, it is visible in a way that a slightly better deductible is not, and it seeds accounts for employees who would otherwise never enroll, which raises participation and improves the payroll tax arithmetic in the previous section.
Contributions on the dependent care side follow different rules and count toward the same $7,500 ceiling as the employee's own salary reduction. They also feed straight into the nondiscrimination test, so an employer contribution structured around who actually has young children is exactly the pattern that test is designed to catch.
Dwight SchruteSales3 people
Darryl PhilbinWarehouse1 person
Kelly KapoorCustomer Service1 personFSA vs HSA: The Comparison That Decides Your Design
FSAs and HSAs get compared as though an employer picks one. In practice a health savings account requires a qualifying high deductible health plan, so what you are really choosing is what fits alongside the medical plan you already have.
| Feature | Health FSA | HSA |
|---|---|---|
| Employee owns the account | ||
| Balance carries over in full each year | ||
| Travels with the employee after they leave | ||
| Full annual election available on day one | ||
| Requires a specific type of health plan | ||
| Employer keeps unused amounts | ||
| Employer can offer it without sponsoring a medical plan |
The row employees care about is portability, and the row employers should care about is the fourth one. A health FSA front-loads the employee's access and back-loads their funding, which is generous to them and risky to you. A health savings account does the opposite: the employee can only spend what is actually in the account, so the employer carries no equivalent exposure.
The combination that works, and the one most small employers should be aiming at, is a high deductible plan with a health savings account plus a limited purpose FSA for dental and vision. Employees get pre-tax treatment on both categories, health savings account eligibility survives, and the uniform coverage exposure is confined to a small limited purpose account rather than a full medical one.
If you are still choosing a medical plan, settle that first while you compare your health insurance options, because everything here follows from it.
How to Set One Up
Setting up an FSA is a project of weeks rather than days for a small business, and most of the elapsed time is waiting on a plan document rather than doing anything difficult. The order matters, because two of the steps are hard to reverse once elections are locked.
Every line in those steps is a decision that ends up in the plan document, and the document is what governs once elections are locked. Write the decisions down before the first call with a broker or an administrator, so the conversation is about whether your choices work rather than about what you want. The record below is also the thing to hand to whoever inherits this benefit from you.
Choosing an FSA Administrator
An FSA administrator is the third party that runs the plan day to day: it drafts the plan document, holds the elections, issues the debit cards, substantiates claims against IRS rules, and produces the nondiscrimination testing. Almost no small business does this internally, because substantiation alone is a weekly job with a compliance consequence attached to getting it wrong.
Four things separate provider quotes that look identical. The monthly minimum, which decides what a ten-person plan really costs when only four people enroll. Whether the plan document and its amendments are included or billed separately. Whether nondiscrimination testing is run every year or only when you ask. And what happens to open claims if you move administrators mid-year.
Keeping the signed elections, the plan document, and the enrollment communications in one findable place is the part everyone underestimates until the year they need to prove what someone elected. That record-keeping layer is what FirstHR is built to carry, alongside the rest of the employee file.
Where Small Employers Get This Wrong
The failure patterns here are consistent, and almost all of them are decided before anybody enrolls.
Offering a general purpose health FSA alongside a high deductible plan is the most expensive of these mistakes. It quietly destroys health savings account eligibility for everyone who enrolls and for their spouses, and nobody finds out until someone files their taxes. The limited purpose version costs the same to administer and does not do this.
Setting the election ceiling at the federal maximum by default is the second. There is no rule requiring it, the federal figure is designed for employers who can absorb a mid-year departure without noticing, and most small companies are not that employer.
Assuming the dependent care increase applied itself is the third, and it stays common while plan documents catch up. The statute changed; a plan document that names $5,000 did not. Employees who read about $7,500 in the news and find $5,000 in your enrollment portal will assume you decided against it, whether or not you ever considered it.
Testing after elections are locked is the fourth. Nondiscrimination testing is a design tool if you run it in September and a correction notice if you run it in December, and the people it lands on are usually the owners.
And treating enrollment as a form rather than an explanation is the last. This benefit is genuinely confusing, the commitment is annual, and the money is real. When employees end up unhappy with it, the cause is rarely the plan design and almost always the fifteen minutes nobody spent explaining it, which is the same failure mode as most of the rest of benefits administration.
Nick Anisimov, FirstHR founder
Frequently Asked Questions
What is an FSA in simple terms?
An FSA, or flexible spending account, is a benefit an employer sets up so employees can pay qualifying medical or dependent care costs with money taken from their pay before tax. The employer has to adopt a written Section 125 cafeteria plan first, because the account cannot exist outside one. During enrollment the employee chooses a yearly amount, payroll withholds it in equal pre-tax slices across the year, and the employee claims reimbursement by submitting eligible expenses. Every dollar that goes through it escapes payroll tax for both the employee and the employer. The balance belongs to the plan, not to the employee, so it stays behind when they leave.
What is the FSA contribution limit?
A health FSA is capped at $3,400 of salary reduction for plan years that begin in 2026, and up to $680 of unused money can roll into the next plan year if the plan allows a carryover. Both numbers come from IRS Revenue Procedure 2025-32. Dependent care FSAs have their own, much higher cap: $7,500, or $3,750 for a married person filing a separate return, after the tax law enacted in July 2025 raised it. The IRS updates the health FSA figures for inflation every autumn, but the dependent care cap is not indexed. Your own plan document can set a lower maximum than either, and many employers choose to.
Does an employer lose money on an FSA?
It can, though it can also come out ahead. The uniform coverage rule makes a health FSA participant's whole yearly election usable from the first day of the plan year, so an employee could spend all of it in January and quit in February. The business covers the shortfall and has no way to collect it from the person who left. The opposite happens when employees leave money unclaimed: those amounts are forfeited to the plan. In a typical workforce the losses and forfeitures tend to cancel out, and the employer's 7.65 percent payroll tax saving on each salary reduction dollar is often enough to pay the administration fee by itself.
Is a commuter benefit an FSA?
No, even though people routinely call it a commuter FSA. Transit and parking benefits fall under Section 132(f) of the tax code as qualified transportation fringe benefits, while flexible spending accounts sit under Section 125. That difference changes how the benefit works in practice. The cap is monthly, not annual: $340 per month each for transit and parking in 2026. Employees can usually adjust their election from one month to the next rather than committing for the whole year, and money they do not use carries forward instead of being lost. Offering one means buying a separate product under separate rules.
Can an employee have an FSA and an HSA at the same time?
Not a general purpose health FSA. Coverage under one is disqualifying coverage that blocks health savings account eligibility, and it blocks it for the employee's spouse as well, because a general purpose FSA can reimburse the family's pre-deductible expenses. A limited purpose health FSA, restricted to dental, vision, and preventive care, is compatible and is the standard fix. A dependent care FSA has no effect on health savings account eligibility at all. If anyone on your team contributes to a health savings account, decide this before enrollment rather than after.
Do employers have to offer an FSA?
No. Federal law does not require an employer to offer any kind of flexible spending account. It is a voluntary benefit, and taking it on means real work: you adopt a written cafeteria plan, run the nondiscrimination tests, and either process claims yourself or pay an administrator to handle them. FSAs are widespread without being standard. The Bureau of Labor Statistics National Compensation Survey for March 2026 found that 47 percent of workers in private industry could use a healthcare FSA through their job. At the smallest establishments, those with fewer than 50 workers, the share was 29 percent.
What happens to unused FSA money?
It is forfeited. Under the use-it-or-lose-it rule, health FSA money still unspent when the plan year closes is lost to the employee, subject to one of two kinds of relief the plan may offer. The first is a carryover, which for a plan year beginning in 2026 can move as much as $680 of the leftover balance into the next plan year. The second is a grace period of up to two and a half months during which the employee can keep incurring new eligible expenses. A plan can offer one or the other, not both. A run-out period is a different thing: it only extends the deadline for filing claims on expenses the employee had already incurred. Whatever is forfeited stays with the plan, to be used only in the ways the plan document allows.
Does an FSA need a plan document?
Yes. Salary reduction is pre-tax only when it runs through a written Section 125 cafeteria plan; without that document, the same money is ordinary taxable pay. The document fixes the plan year, who is eligible, the largest election allowed, and whether unused money gets a carryover or a grace period. It also decides whether employees can use the higher dependent care limit. If your document names $5,000, an amendment is needed before anyone can elect $7,500, and an amendment works only from the later of two dates, the day it is adopted or the effective date written into it, so it must be signed before anyone elects the higher amount. A third-party administrator usually drafts the document, but the employer is the one that adopts it.
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