Small Business FSA: Owner Eligibility, Limits, and Setup

Setting up a Flexible Spending Account at a small business means adopting a written Section 125 cafeteria plan, hiring a third-party administrator, running an annual open enrollment, and passing three nondiscrimination tests each year. A small business FSA lets employees redirect pre-tax salary toward medical or dependent care costs, and it saves the employer 7.65% in payroll taxes on every dollar contributed. The catch that surprises most owners: if your company is a sole proprietorship, partnership, or S-corp, you can offer the plan to your staff but you cannot use it yourself.

Can the Owner Participate

Start here, because the answer changes whether an FSA makes sense for you personally or only for your employees.

Sole Proprietors, Partners, and S-Corp Shareholders

The IRS treats owners of pass-through entities as self-employed, not as common-law employees.¹ Section 125 defines a cafeteria plan as one in which “all participants are employees,” which shuts self-employed individuals out.² For S-corporations, any shareholder who owns more than 2% is excluded.³ The exclusion extends to your spouse and dependents if they would only qualify through your ownership stake.

You can still set up the plan for your employees and collect the employer payroll tax savings. You just cannot elect into it. If you want a tax-advantaged way to cover your own medical costs, a Health Savings Account paired with a high-deductible health plan is the usual alternative.

C-Corporation Shareholders

C-corp shareholders who work for the company are common-law employees and can participate on the same terms as anyone else.⁴ They usually count as highly compensated or key employees under the plan’s nondiscrimination tests, so their elections get extra scrutiny.

The Two FSAs You Can Offer

A single cafeteria plan can include both a Health Care FSA and a Dependent Care FSA. Employees can enroll in either or both, and the contribution limits are separate.

A Health Care FSA reimburses medical, dental, and vision expenses that insurance does not fully cover: copays, deductibles, prescriptions, and a broad list of over-the-counter items including menstrual care products. If you also offer a high-deductible health plan with HSA eligibility, the standard Health Care FSA creates a conflict because both accounts cover the same expenses. A Limited Purpose FSA, which restricts reimbursement to dental and vision costs, solves this and preserves HSA eligibility.

A Dependent Care FSA pays for care that lets an employee (and their spouse, if married) work or look for work.⁵ Eligible dependents are children under 13 and adults who cannot care for themselves.⁶ Daycare, preschool, before- and after-school programs, and summer day camp qualify. Overnight camps and tuition from kindergarten up do not.

2026 Contribution Limits

Health Care FSA employee contribution: $3,400 for the year.⁷
Health Care FSA carryover: up to $680 into the following plan year if the plan allows it.⁷
Dependent Care FSA: $5,000 per household, or $2,500 for married taxpayers filing separately.⁶

The Dependent Care limit is set by statute and does not adjust for inflation. The Health Care FSA limit is inflation-indexed and worth rechecking each fall when the IRS releases updated figures. Employers can contribute to an employee’s Health Care FSA, but employer plus employee contributions cannot exceed the $3,400 ceiling.

Steps to Set Up the Plan

Adopt a Written Plan Document

Every Section 125 cafeteria plan must exist as a written document before any employee makes an election.² The document spells out the plan year, contribution limits, FSA types offered, how unused funds are handled, and eligibility rules. Without it, every pre-tax election loses its tax treatment retroactively. Most small businesses have their TPA or a benefits attorney draft this.

Hire a Third-Party Administrator

A TPA processes claims, verifies expense eligibility, issues FSA debit cards, and runs the annual nondiscrimination tests. Self-administration is legal but impractical, because the IRS requires every claim to be substantiated against third-party documentation such as a receipt or explanation of benefits before reimbursement.⁸

TPA pricing varies. Some charge a flat monthly fee per participant; others charge an annual plan fee plus per-employee costs. When comparing quotes, check whether nondiscrimination testing, plan document drafting, and debit card issuance are bundled or billed as add-ons.

Distribute a Summary Plan Description

Before employees can elect into the plan, each one must receive a Summary Plan Description that explains eligibility, contribution limits, the claims process, and what happens to unused funds.⁹ Give it out well before open enrollment so employees can estimate their expenses.

Run Open Enrollment

Employees pick their contribution amounts during an annual open enrollment window. Elections lock in for the plan year. An employee cannot change their contribution mid-year unless they experience a qualifying event such as marriage, divorce, a birth or adoption, or a change in employment status for the employee or their spouse, and the change must be consistent with the event.¹⁰

The Uniform Coverage Rule

This one catches small employers off guard, so understand it before you offer the plan. The full annual Health Care FSA election must be available for reimbursement on day one of the plan year, no matter how little the employee has actually contributed through payroll.¹¹

If an employee elects $3,400 for the year and has a $3,400 medical bill in January, they get reimbursed the full amount from your general funds after one payroll deduction. You recoup the rest through the remaining paychecks. If that employee leaves in February, you generally cannot recover the overpayment. High turnover amplifies the exposure. The rule applies only to Health Care FSAs; Dependent Care FSA reimbursements are capped at the amount contributed to date.

Nondiscrimination Testing

Annual nondiscrimination testing keeps the plan from tilting toward owners and highly paid staff. Section 125 requires three tests.²

The eligibility test checks that highly compensated individuals do not have easier access than other employees. Any waiting period or hours requirement has to apply to everyone. A highly compensated individual for these purposes includes officers, owners of more than 5%, and the highest paid employees.

The contributions and benefits test looks at whether highly compensated participants receive a disproportionate share of the plan’s total benefits. If your highly paid staff max out while most other employees contribute little, the plan can fail. Broad participation is the reliable fix.

The key employee concentration test caps benefits going to key employees at 25% of total benefits under the plan.² A key employee is any officer earning more than $235,000 for 2026 plan years, or anyone owning more than 5%.¹² In a five-person company where the owner participates, hitting 25% is easy. You may need to lower your own election or push participation among other staff.

If the plan fails, the tax-free treatment is revoked only for the individuals who caused the failure. Their contributions and reimbursements get added back to their taxable income. Everyone else keeps the tax benefit. Your TPA should run the tests each year and flag problems before the plan year closes.

Grace Period or Carryover

Unspent funds are forfeited to the employer at year-end under the use-it-or-lose-it rule. You can soften this with one of two options, but not both.

A grace period gives employees an extra two and a half months after the plan year to incur new eligible expenses using the prior year’s balance. For a calendar-year plan, that runs through March 15. Funds unspent after the grace period are forfeited.¹³
A carryover rolls up to $680 of unused Health Care FSA funds into the next plan year with no deadline pressure on spending. Anything above $680 is forfeited.⁷

A grace period helps employees with large balances left over because there is no dollar cap on grace-period spending. A carryover is simpler to administer. Most small businesses prefer the carryover.

Separately, your plan document should set a run-out period, commonly 90 days, during which employees can file claims for expenses already incurred inside the plan year. The run-out period extends filing time, not spending time. If your plan has a grace period, the run-out window must extend past the grace period’s end so employees can submit those final claims.

Carryover applies only to Health Care FSAs. Dependent Care FSAs can use a grace period but cannot carry funds over.

What the Employer Saves

Every dollar an employee redirects into an FSA is exempt from the employer’s share of Social Security (6.2%) and Medicare (1.45%) taxes, a combined 7.65% savings. For a company with 20 employees each contributing $2,000, that is roughly $3,060 in annual payroll tax savings, which often covers the TPA fee.

Forfeited funds also revert to the employer. You should not treat them as a revenue line, but they can offset administration costs or reduce future salary reductions for participants, depending on how the plan document is written.

Ongoing Compliance

W-2 Reporting

Dependent Care FSA contributions go in Box 10 of each participating employee’s W-2, and amounts exceeding $5,000 are also added to Box 1 as taxable wages.¹⁴ Health Care FSA contributions are simply excluded from Box 1 wages and do not need a separate entry.

Form 5500

Welfare benefit plans generally file an annual Form 5500 with the Department of Labor.¹⁵ A welfare plan covering fewer than 100 participants and paid from the employer’s general assets is exempt.¹⁶ Because FSA reimbursements typically come from the employer’s cash flow rather than a separate trust, most small-business plans qualify.

Claims Substantiation

Every reimbursement must be backed by documentation proving the expense is eligible. Many pharmacies and retailers verify items at the point of sale through an inventory information approval system, but not every merchant does. When automatic verification is not available, the TPA requests receipts or explanation-of-benefits forms. If an improper payment slips through, the employer follows correction procedures starting with a repayment request and, if needed, offsets against future reimbursements.⁸ Weak substantiation is a fast way to lose the plan’s tax-advantaged status.

When an Employee Leaves

Access to Health Care FSA funds usually ends on the employee’s last day of employment or the end of that month, per the plan document. They can still file claims for expenses incurred before the cutoff during the run-out period. Because a Health Care FSA is a group health plan, COBRA continuation applies, but it is only financially attractive when the employee has been reimbursed more than they have contributed, so employers rarely see many elections.

Dependent Care FSAs are simpler. The former employee can keep submitting claims for expenses incurred during the plan year, up to the remaining account balance, through the end of the run-out period. COBRA does not apply.

1
Internal Revenue Service. Self-Employed Individuals Tax Center
2
Office of the Law Revision Counsel. 26 USC 125 – Cafeteria Plans
3
Internal Revenue Service. S Corporation Compensation and Medical Insurance Issues
4
Internal Revenue Service. Paying Yourself
5
FSAFEDS. Dependent Care FSA
6
Internal Revenue Service. Publication 503 – Child and Dependent Care Expenses
7
Internal Revenue Service. Revenue Procedure 2025-32
8
Internal Revenue Service. Revenue Ruling 2003-43
9
U.S. Department of Labor. Plan Information
10
eCFR. 26 CFR 1.125-4 – Permitted Election Changes
11
Internal Revenue Service. IRS Notice 2013-71 – Modification of Use-or-Lose Rule for Health FSAs
12
Internal Revenue Service. IRS Notice 2025-67 – 2026 Amounts Relating to Retirement Plans
13
U.S. Office of Personnel Management. Flexible Spending Account FAQs
14
Internal Revenue Service. Employee Reimbursements, Form W-2, Wage Inquiries
15
U.S. Department of Labor. Form 5500 Series
16
eCFR. 29 CFR 2520.104-20 – Limited Exemption for Certain Small Welfare Plans