Yes. You can use your FSA for a spouse not on your insurance. A health care FSA reimburses qualified medical expenses for you, your spouse, and your dependents regardless of whose health plan any of you are enrolled in, or whether your spouse is enrolled in any plan at all. The IRS ties FSA eligibility to your legal marital status, not to who appears on your employer’s health plan roster.
Why Insurance Enrollment Doesn’t Matter
Your FSA is a reimbursement account funded through your employer’s cafeteria plan under IRC Section 125. It sits alongside your medical, dental, and vision insurance, but it isn’t part of them. Under IRC Section 105(b), amounts paid to reimburse medical expenses for an employee, their spouse, or their dependents are excluded from gross income.1Office of the Law Revision Counsel. 26 USC 105 – Amounts Received Under Accident and Health Plans The statute says “spouse.” It does not say “spouse enrolled in the same health plan.”
IRS Publication 502 spells out the practical rule: you can include medical expenses you paid for your spouse as long as you were married either when the medical service was provided or when you paid for it.2Internal Revenue Service. Publication 502 (2025), Medical and Dental Expenses So a doctor visit your spouse had in March and you paid for in June qualifies. Treatment your spouse received before the wedding that you paid after also qualifies. Whose insurance card was presented at the office never enters the analysis.
Who the IRS Treats as Your Spouse
Under 26 CFR 301.7701-18, a marriage is recognized for federal tax purposes if it was valid under the laws of the state, territory, or possession where it took place.3eCFR. 26 CFR 301.7701-18 – Definitions; Spouse, Husband and Wife, Husband, Wife, Marriage Your current state of residence is not the question. A same-sex marriage performed in any jurisdiction that legally authorized it qualifies. A marriage performed abroad qualifies if it would be recognized as a marriage under the laws of at least one U.S. state. Common-law marriages qualify when they are valid under the law of the state where they were entered into.
One boundary matters here. Registered domestic partnerships, civil unions, and similar arrangements not called “marriage” under the law that created them do not count for federal tax purposes, even in states that grant them spouse-equivalent rights.3eCFR. 26 CFR 301.7701-18 – Definitions; Spouse, Husband and Wife, Husband, Wife, Marriage An unmarried partner can sometimes qualify as a “dependent” for reimbursement purposes under IRC Section 152, but only if they lived with you all year, had gross income under $5,200 for the year, and received more than half their support from you.4Internal Revenue Service. Publication 501 (2025), Dependents, Standard Deduction, and Filing Information That income cap rules out most working partners.
What Expenses You Can Reimburse for Your Spouse
The list of eligible expenses for a spouse is the same list that applies to you. There is no reduced version. Doctor visit copays, prescription drugs, lab work, diagnostic tests, dental cleanings, fillings, extractions, contact lenses, prescription eyeglasses, and mental health treatment all qualify.2Internal Revenue Service. Publication 502 (2025), Medical and Dental Expenses
The underlying test is whether the expense is for the diagnosis, cure, treatment, or prevention of disease, or for something that affects a structure or function of the body.5Cornell Law Institute. 26 USC 213(d)(1) – Definition of Medical Care Costs that only improve general health or appearance don’t qualify. Teeth whitening, cosmetic surgery that doesn’t treat a disease or correct a deformity, non-prescription vitamins, and general wellness supplements are all out.2Internal Revenue Service. Publication 502 (2025), Medical and Dental Expenses
The HSA Problem If Your Spouse Has One
This is the mistake that costs real money. If your spouse is enrolled in a High Deductible Health Plan and contributes to a Health Savings Account, a standard general-purpose health FSA on your side can disqualify them. A general-purpose FSA can reimburse any qualified medical expense for your spouse, which is “first-dollar coverage,” and that makes your spouse ineligible to contribute to an HSA.6Internal Revenue Service. Publication 969, Health Savings Accounts and Other Tax-Favored Health Plans The disqualification applies even if your spouse never actually submits a claim to your FSA. Mere eligibility is enough.
Two employer-side options preserve your spouse’s HSA eligibility. A limited-purpose FSA covers only dental and vision expenses, so it doesn’t count as disqualifying medical coverage. A post-deductible FSA doesn’t reimburse anything until the HDHP’s minimum annual deductible has been met.6Internal Revenue Service. Publication 969, Health Savings Accounts and Other Tax-Favored Health Plans If your spouse’s HSA matters to your household, ask your benefits administrator whether either option is available before you enroll in a standard health FSA.
Coordinating With Your Spouse’s Other Coverage
You cannot be reimbursed twice for the same expense. When you submit a claim, you have to certify that the expense hasn’t been paid or reimbursed by any other health plan.6Internal Revenue Service. Publication 969, Health Savings Accounts and Other Tax-Favored Health Plans The order is straightforward. If your spouse has their own insurance, that insurance pays first. Your FSA can then reimburse whatever qualified amount the insurance didn’t cover: copays, deductibles, coinsurance, and uncovered eligible services.
If both of you have a health care FSA, the same principle applies. Submit each expense to one account. Any remaining unreimbursed balance can then go to the other. You can’t send the full amount to both at once. Keep the Explanation of Benefits from your spouse’s insurer with your receipts; it shows exactly what the insurance paid and what you still owe, which is the paper trail your FSA administrator will expect.
Adjusting Your Election After You Marry
FSA elections are usually locked for the plan year once open enrollment closes. Marriage is a qualifying life event that opens a mid-year window. You can increase your FSA contribution to reflect your new spouse’s anticipated medical expenses, and the change has to be consistent with the event, so this is a route to add funding, not to cut it for unrelated reasons.
Most plans require the request within 30 days of the marriage. Some allow up to 60. Check with your HR department quickly, because missing the window locks you into the original election until next open enrollment, and that can mean a full year of your spouse’s expenses sitting outside your FSA.
Filing a Claim for a Spouse’s Expense
The process is the same as filing for yourself. You’ll need an itemized receipt showing the date of service, provider name, description of the service, and amount charged. If your spouse has separate insurance, include the Explanation of Benefits showing what was covered and what balance remains. On the claim form, list your spouse as the patient, and make sure the name matches your documents exactly. Most administrators accept claims through an online portal or mobile app, with paper forms still available at some.
Keep a copy of your marriage certificate somewhere accessible. You won’t submit it with each claim, but if the administrator flags a spousal expense for verification, having proof of marriage ready avoids delays.