Health FSA Uniform Coverage Rule: What Employers Owe When an Employee Quits

The health FSA uniform coverage rule is the reason an employee can elect $3,400 for the year, have a $2,800 procedure in February, and get reimbursed in full after only a few paychecks. That is great for the employee. For the employer, it means a real financial exposure that most small business owners do not know about until someone quits in March with an overspent account.

This guide explains what the rule requires, how much it can cost, why most employers still come out ahead, and the plan design choices that keep the risk small.

What Is the Health FSA Uniform Coverage Rule?

The health FSA uniform coverage rule is an IRS requirement that the maximum reimbursement from a health flexible spending account must be available at all times during the plan year. A health FSA, or health flexible spending account, is a pre-tax account offered through a Section 125 cafeteria plan that employees use to pay out-of-pocket medical, dental, and vision costs. The rule comes from Proposed Treasury Regulation Section 1.125-5(d), which employers are allowed to rely on.

Under the rule, the amount an employee can be reimbursed at any point in the year cannot depend on how much the employee has contributed so far. It depends only on the annual election, minus any claims already paid. An employer also cannot speed up an employee's payroll deductions because the employee filed large claims early in the year.

For 2026, the IRS allows employees to elect up to $3,400 in a health FSA, according to IRS Revenue Procedure 2025-32. If you want the basics of how a Section 125 plan works before going further, see our complete Section 125 cafeteria plan guide.

What Happens When an Employee Quits After Overspending Their FSA?

When an employee quits after being reimbursed more than they contributed to their health FSA, the employer absorbs the difference and cannot collect it from the employee. IRS Chief Counsel Advice 201012060 states this directly: if an employee's reimbursements exceed their contributions at the time of layoff or termination, the employer cannot recoup the difference.

The employer cannot deduct the shortfall from the final paycheck, send a bill, or ask the employee to repay it. The loss stays with the plan.

A Worked Example

Here is how the math plays out for a single employee paid every two weeks.

The employee in this example did nothing wrong. The employee used the benefit exactly as the uniform coverage rule allows. The $2,015.38 gap is the employer's cost of offering a health FSA.

Does the Uniform Coverage Rule Apply to a Dependent Care FSA?

No. The uniform coverage rule applies only to health FSAs. A dependent care FSA, which reimburses child care and adult day care costs, only has to pay out what the employee has actually contributed so far in the year.

That difference means dependent care FSAs carry no overspend risk for the employer. The 2026 dependent care FSA limit rose to $7,500, and you can read how that limit works in our dependent care FSA limit guide.

How Do FSA Forfeitures Offset Overspent Accounts?

FSA forfeitures offset overspent accounts because the same plan that absorbs losses from employees who quit also keeps the money that other employees fail to spend. This is the use-it-or-lose-it rule. Any health FSA balance left at the end of the plan year, after any carryover or grace period, is forfeited to the plan.

The IRS calls the net result an experience gain or an experience loss. In most plans, forfeitures are larger than overspend losses, so the plan ends the year with a gain.

Hypothetical Year-End Ledger for a 25-Employee Business

This is a disclosed hypothetical, not data from any real employer.

What Can an Employer Do With FSA Experience Gains?

Proposed Treasury Regulation Section 1.125-5(o) allows three uses for health FSA experience gains:

1. Reduce required salary reductions for the next plan year, on a reasonable and uniform basis.
2. Return the gains to employees on a reasonable and uniform basis, but not based on each employee's own claims.
3. Pay the cost of administering the cafeteria plan.

Most employers choose the third option. Employers cannot give forfeitures back only to the employees who forfeited them, because that would undo the risk-sharing the rules require.

How Do Carryovers and Grace Periods Change the Risk?

Carryovers and grace periods lower an employer's forfeiture income, which means less cushion to absorb overspend losses. For 2026, an employer can let employees carry up to $680 of unused health FSA money into the next plan year, according to IRS Revenue Procedure 2025-32. The alternative is a grace period of up to 2.5 months to spend leftover funds.

Both features are popular with employees and make enrollment easier. They also shrink the forfeiture pool. A small employer with high turnover should weigh that tradeoff before adding either one. Our FSA grace period vs. carryover guide walks through the choice in detail.

Can an Employer Limit Its Uniform Coverage Risk?

Yes. An employer can limit its uniform coverage risk through plan design, but it cannot limit the rule itself. Here is a checklist you can use with your plan administrator.

The first three choices are the practical levers. The last three are the mistakes that most often get small employers into trouble.

Does COBRA Apply to an Overspent Health FSA?

COBRA generally does not have to be offered to an employee whose health FSA is overspent. A health FSA has a limited COBRA obligation under Treasury Regulation Section 54.4980B-2, Q&A-8. The plan only has to offer COBRA if the employee could receive more in benefits for the rest of the year than the maximum COBRA premium the plan could charge.

An employee who already spent more than they contributed has no remaining benefit worth continuing, so COBRA is usually not required for the FSA. Medical plan COBRA is a separate question. See our COBRA health insurance guide for the full rules.

Is a Health FSA Still Worth Offering Through a Section 125 Plan?

Yes. For most small employers, a health FSA is still worth offering because the payroll tax savings and the forfeiture pool usually outweigh overspend losses. Every dollar an employee puts into a health FSA through a Section 125 plan avoids the employer's 7.65% share of FICA, the Social Security and Medicare payroll tax.

An employee who elects the full $3,400 in 2026 saves the employer $260.10 in FICA for the year ($3,400 x 7.65%). Across a few participants, that savings alone can exceed a single overspend loss.

The larger savings usually come from moving employee health premium contributions through the Section 125 plan. Summit Health Benefits clients typically recapture $91 to $136 per enrolled employee per month in employer FICA. After Summit's $35 per enrolled employee per month administration fee, the net employer benefit is $56 to $101 per enrolled employee per month. Our FICA tax savings guide shows the full calculation.

If you are comparing a health FSA with other options such as an HSA, our HSA vs. FSA comparison explains the differences. Many small employers also pair a Section 125 plan with lower-cost coverage options covered in our small business health insurance alternatives guide.

Frequently Asked Questions

Sources: IRS Revenue Procedure 2025-32 (2026 health FSA limit of $3,400 and $680 carryover); Proposed Treasury Regulation Section 1.125-5(d) (uniform coverage rule) and Section 1.125-5(o) (experience gains), published in the Federal Register in 2007; IRS Chief Counsel Advice 201012060 (employer cannot recoup overspent health FSA amounts); Treasury Regulation Section 54.4980B-2, Q&A-8 (limited COBRA obligation for health FSAs); IRS (7.65% employer FICA rate). Dollar examples in this article are illustrative and based on 2026 limits.