If you use an FSA for non-medical expenses, your plan administrator will try to recover the money before anything else happens: they’ll ask you to pay it back, withhold it from your paycheck, or subtract it from a future legitimate claim. Only if none of those work does your employer add the amount to your W-2 as taxable wages, and you then owe federal income tax plus Social Security and Medicare tax on every dollar. The debit card gets shut off along the way. There’s no separate 20% penalty like an HSA carries, but the money is effectively double-spent: once on the ineligible purchase, again at tax time.
The Correction Steps Your Employer Must Follow
The IRS doesn’t let employers improvise here. Proposed Treasury Regulation Section 1.125-6 lays out a specific sequence when an improper FSA payment happens.1Internal Revenue Service. IRS Chief Counsel Memorandum – Proposed Treasury Reg 1.125-6 If the improper payment was made with a debit card, the first move is always deactivating the card until the situation is resolved. You can still submit paper claims with receipts during that period, but the card stays off.
After the card is frozen, your employer works through the recovery methods in order:
- Demand repayment directly, usually by check or electronic transfer.
- Withhold the amount from your paycheck, to the extent state wage deduction laws allow. Many states require your written authorization, so employers move carefully.
- Offset the amount against a future eligible claim in the same plan year. If you have a $200 improper payment outstanding and later submit a valid $250 claim, you’d be reimbursed only $50.
The offset method has a hard limitation: the substitute claim must fall within the same plan year as the original improper distribution.2Internal Revenue Service. IRS Notice 2013-71 You can’t pull a medical receipt from a prior plan year and use it to plug the hole.
Only after these methods have been exhausted can your employer treat the improper payment as taxable income. The IRS guidance is explicit that this is the last resort, not the routine outcome.1Internal Revenue Service. IRS Chief Counsel Memorandum – Proposed Treasury Reg 1.125-6 Your employer has an obligation to try the earlier steps first.
What the Tax Bill Looks Like If Recovery Fails
When every correction method has been tried and the money still hasn’t been recovered, the improper distribution gets added to your W-2 as taxable wages.3Internal Revenue Service. Publication 525, Taxable and Nontaxable Income It shows up on Form 1040, line 1a, alongside your regular pay.
The cost depends on your bracket. Federal income tax rates range from 10% to 37%.4Internal Revenue Service. Federal Income Tax Rates and Brackets Social Security and Medicare taxes add another 7.65%.5Social Security Administration. Social Security and Medicare Tax Rates For someone in the 22% federal bracket, a $500 improper distribution creates roughly $148 in combined federal taxes on top of whatever you already spent. State income tax adds more in most states.
One thing FSAs do not carry is the extra penalty that hits an HSA. HSA holders who spend funds on non-medical purchases owe a 20% penalty on top of regular income tax.6Internal Revenue Service. Publication 969, Health Savings Accounts and Other Tax-Favored Health Plans With an FSA, you lose the pre-tax benefit and pay ordinary income and payroll taxes, but there’s no percentage fine stacked on top.
There’s a bigger risk sitting behind the individual tax bill. Unresolved improper distributions can threaten the entire cafeteria plan’s tax-exempt status. If the IRS decides a plan isn’t being run in compliance with Section 125, every participant could lose the tax-free treatment of their contributions for the year.7Office of the Law Revision Counsel. 26 USC 125 – Cafeteria Plans That’s why administrators pursue small unsubstantiated claims as aggressively as large ones.
How the Purchase Gets Flagged
Every FSA reimbursement has to be substantiated before the plan can treat it as tax-free. Your administrator verifies that each transaction matches a qualified medical expense.8Internal Revenue Service. FAQs for Government Entities Regarding Cafeteria Plans Some transactions clear automatically because they occur at pharmacies or medical providers with built-in coding. Others get held for manual review.
When a transaction can’t be verified automatically, the administrator sends you a notice asking for a receipt or an explanation of benefits showing the date of service, the treatment, and your out-of-pocket amount. If you don’t respond, or if the documentation shows the expense wasn’t qualified medical care, the claim is denied even though the money has already left the account.
The response deadline is set by your plan, not by federal law. Most plans give you 30 to 60 days, though the IRS doesn’t mandate a specific number.9Internal Revenue Service. Claims Substantiation for Payment or Reimbursement of Medical and Dependent Care Expenses Once that window closes without adequate proof, the transaction becomes an improper distribution and the correction sequence begins.
A common misunderstanding: the debit card clearing at the register does not mean the expense is approved. The card working and the expense being substantiated are two separate events. The substantiation request that shows up later is the actual approval step.
What Doesn’t Qualify in the First Place
FSA-eligible expenses must meet the IRS definition of medical care: costs for diagnosing, treating, or preventing disease, or for affecting any part or function of the body. Doctor visits, prescriptions, dental work, vision care, and medical equipment qualify. Since the CARES Act took effect in 2020, over-the-counter medications and menstrual care products qualify without a prescription.
What doesn’t qualify is anything “merely beneficial to general health.”10Internal Revenue Service. Publication 502, Medical and Dental Expenses The phrase sounds vague but draws a clear line in practice. Purchases that regularly fail the test include:
- Cosmetic procedures like teeth whitening, elective cosmetic surgery, and electrolysis
- General fitness costs: gym memberships, personal trainers, swimming lessons, dance classes
- Everyday personal items like toiletries, deodorant, and basic skincare not treating a diagnosed condition
- Vitamins, supplements, and weight-loss programs when not prescribed for a specific disease
- Non-medical services such as marriage counseling, career counseling, and childcare for a healthy baby
The full list in IRS Publication 502 runs dozens of entries. A simple check: would this expense exist even if you had no medical condition? If yes, it almost certainly doesn’t qualify.
Some purchases sit in a gray zone because they serve both a medical and a personal purpose, such as massages for chronic back pain, air purifiers, or certain supplements. For those, your administrator will want a letter of medical necessity from your doctor stating the diagnosis and the recommended treatment. Without it, the administrator has no basis to approve the expense and will flag it.
Fixing a Mistake Before It Becomes Taxable
The offset method is the reader’s friend if you catch a problem early. Any legitimate medical expense you submit in the same plan year can absorb an outstanding improper payment. That’s often the easiest fix: schedule the dental cleaning you’ve been putting off, refill a prescription, replace worn-out glasses, or pick up eligible supplies you’ll actually use. Stockpiling large quantities of eligible items purely to drain the account is not allowed, and administrators watch for unusual purchasing patterns near year-end.
Leaving your job complicates the fix. Once employment ends, you generally cannot incur new FSA-eligible expenses, which means the offset route may close. Panic spending on the way out the door is the most common trigger for improper distributions in the first place, and dealing with the correction process as a former employee is harder than dealing with it while still on payroll. If your last day is coming, use the balance on legitimate care first: a dental visit, an eye exam, replacement contacts, or over-the-counter medications you’ll use anyway.
If you receive a substantiation request, respond to it before the plan’s deadline. A missing receipt is fixable while the window is open. Once it closes, the correction machinery starts turning, and the path back to a clean tax year runs through repayment, withholding, or a substitute claim before December 31 of the plan year in which the improper payment occurred.