FSA Eligibility Rules: Contributors, Expenses, and Enrollment

FSA eligibility rules are narrower than most people expect: to contribute to a Flexible Spending Account, you must be a common-law W-2 employee of an employer that sponsors a Section 125 cafeteria plan. Self-employed workers, independent contractors, partners in a partnership, and shareholders who own more than 2% of an S-corporation are shut out entirely, even if they run the very business offering the plan. Everything else — how much you can set aside, whose expenses you can cover, when you can change your election — sits on top of that basic qualification.

Who Can Contribute

An FSA only exists through an employer. You cannot open one on your own, buy one on the individual market, or obtain one through a government exchange. The account rides on a written Section 125 cafeteria plan that the employer chooses to maintain.¹ If your employer doesn’t sponsor one, there is no path in.

Where a plan exists, participation is limited to common-law employees. In practice that means you get a W-2, the employer controls when, where, and how you do your work, and payroll taxes are withheld from your pay.² Independent contractors, freelancers, and anyone paid on a 1099 are not eligible.

Full-time employees typically become eligible during their first open enrollment. Part-time workers may qualify too, but the employer can attach minimum-hours thresholds or waiting periods before part-time staff can enroll. Whatever eligibility rules the employer sets have to apply uniformly across employees in the same classification; the plan can’t quietly let some part-timers in while excluding others in the same role.

Employers also decide which account types to offer (health care, dependent care, or both) and can layer on their own rules, including caps below the IRS maximum. Two employers offering FSAs can produce meaningfully different experiences. The plan document controls, so read your summary plan description before assuming any default applies to you.

Business Owners: The Rules That Trip People Up

Self-employed individuals cannot participate in an FSA. That blanket rule catches more people than expected, and it depends entirely on how the business is structured for tax purposes.³

Sole proprietors and single-member LLC owners are ineligible. The IRS treats you as self-employed even if you pay yourself a salary.
Partners in a partnership are ineligible. Partners receive guaranteed payments or distributive shares rather than W-2 wages, and the code treats them as self-employed for fringe benefit purposes.
S-corporation shareholders owning more than 2% are ineligible. Federal law treats these shareholders as partners, which means self-employed status for fringe benefits like FSAs. This applies even when the shareholder is also on the company’s W-2 payroll.⁴
C-corporation shareholder-employees are eligible. C-corp shareholders are not treated as self-employed for fringe benefit purposes, so an owner who takes a W-2 can participate in the company’s FSA on the same terms as any other employee.

All the excluded owners can still sponsor and fund an FSA for their W-2 employees. They just can’t participate themselves. If an excluded owner routes contributions into their own account anyway, those dollars become taxable income and the plan’s tax-favored status can be put at risk.

Whose Expenses Your FSA Can Cover

Eligibility isn’t only about you. It also governs whose expenses the account can reimburse, and the two account types draw different lines.

Health Care FSA

A health care FSA can reimburse expenses for you, your spouse, any tax dependent you claim, and your children who haven’t turned 27 by the end of the calendar year.⁵ That last category is broader than the standard tax-dependent definition: your adult child’s medical bills can come out of your FSA even if they no longer qualify as your tax dependent, so long as they’re under 27 at year-end.

Stepchildren, adopted children, and foster children qualify under the same rules as biological children. You can also reimburse expenses for a qualifying relative if you provide more than half their financial support and they meet the residency and relationship requirements in the tax code.

Dependent Care FSA

The dependent care FSA is stricter. A qualifying child must be under 13 when the care is provided. Once a child turns 13 during the year, expenses incurred on or after that birthday no longer qualify.⁶ A dependent of any age who is physically or mentally unable to care for themselves also qualifies if they live with you for more than half the year and meet the dependency rules.

Eligible expenses are those that let you (and your spouse, if married) work: daycare, preschool, before- and after-school programs, summer day camps, and in-home care by a babysitter or nanny. Overnight camps do not qualify.

When You Can Enroll or Change Your Election

Enrollment normally happens during your employer’s annual open enrollment or within the first 30 to 60 days of starting a new job. Once you set an election amount, it’s locked for the plan year. The IRS does not permit casual mid-year changes just because your estimate turned out wrong.

The exception is a qualifying life event. If one of these occurs, you can adjust your election within 31 days before to 60 days after the event:

Marriage, divorce, or the death of a spouse
The birth or adoption of a child, or the death of a dependent
A change in your or your spouse’s employment status
A dependent losing eligibility, such as a child turning 13 for dependent care FSA purposes
A change in daycare provider or cost (dependent care FSA only)

The change has to be consistent with the event. A new baby justifies increasing your election; it doesn’t justify decreasing it. And you can never reduce your election below the amount already reimbursed from the account.⁷ Some plans also restrict increases late in the plan year because too few pay periods remain to collect the additional contributions.

Having an FSA and an HSA at the Same Time

You cannot contribute to both a general-purpose health care FSA and a Health Savings Account in the same year. The IRS treats a standard FSA as “other health coverage,” which disqualifies you from HSA contributions.³ The restriction reaches your spouse too. If your spouse enrolls in a general-purpose FSA, you lose HSA eligibility even if you’re not listed as a dependent on their plan.

Two account structures preserve HSA eligibility:

A limited-purpose FSA covers only dental and vision expenses. Because it doesn’t reimburse general medical costs, it doesn’t count as overlapping coverage.
A post-deductible FSA activates only after you meet the annual deductible on your high-deductible health plan, keeping HSA eligibility intact until then.

Switching from a general-purpose FSA to an HSA-eligible plan doesn’t automatically make you HSA-eligible on day one. If your health care FSA has any balance at the end of the plan year and your plan offers a grace period, the IRS treats that grace period as extending your FSA coverage. HSA contributions generally can’t start until the first of the month after the grace period ends, even if you spent the FSA down to zero during it. The cleanest transition is to reach exactly $0 by the plan year’s close.

2026 Contribution Ceilings

Once you’re eligible, the IRS caps how much you can set aside. For 2026:

Health care FSA: $3,400 per employee. This is an individual cap, so if both spouses have access through separate employers, each can contribute up to $3,400.⁸
Dependent care FSA: $7,500 per household for married-filing-jointly and single filers, or $3,750 if married filing separately, up from the $5,000 cap that had been in place for decades. This is a household ceiling, so combined contributions between spouses cannot exceed $7,500.⁹

Employers can set lower caps than the IRS maximum, and many do. The federal number is a ceiling, not a guarantee.

Leaving the Job

Eligibility ends with employment. When you leave, you generally lose access to any remaining balance in your health care FSA. If you’ve been contributing all year and leave in March, the unspent money is gone. Most plans allow a run-out period to submit claims for expenses incurred before your termination date, but you cannot incur new expenses after your last day.

COBRA continuation is technically available for health care FSAs at employers with 20 or more employees, though it rarely pencils out.¹⁰ You’d pay up to 102% of the full cost of the benefit. Because health care FSAs front-load your full annual election at the start of the plan year, COBRA usually only makes sense if you’ve spent less than you’ve contributed and still have large medical expenses ahead.

Dependent care FSAs are more forgiving. You can keep submitting claims for eligible expenses incurred through the end of the calendar year after leaving the job, up to the balance already funded by payroll deductions.

1
Office of the Law Revision Counsel. 26 USC 125 – Cafeteria Plans
2
Internal Revenue Service. Employee (Common-Law Employee)
3
Internal Revenue Service. Publication 969 – Health Savings Accounts and Other Tax-Favored Health Plans
4
Office of the Law Revision Counsel. 26 USC 1372 – Partnership Rules to Apply for Fringe Benefit Purposes
5
Office of the Law Revision Counsel. 26 USC 105 – Amounts Received Under Accident and Health Plans
6
Internal Revenue Service. Publication 503 – Child and Dependent Care Expenses
7
FSAFEDS. FSAFEDS Qualifying Life Event Quick Reference Guide
8
FSAFEDS. New 2026 Maximum Limit Updates
9
Office of the Law Revision Counsel. 26 USC 129 – Dependent Care Assistance Programs
10
U.S. Department of Labor. Continuation of Health Coverage (COBRA)