The FSA Deadline for Gluten-Free Households: Don't Lose That Money

7 min read · Updated October 2026

Most Flexible Spending Account money that is still sitting there when the plan year ends is gone for good. If someone in your house follows a medically necessary gluten-free diet, the extra you paid for gluten-free food is one of the most overlooked ways to use it up.

Quick note: I am a person living with celiac disease, not a tax professional. This is general information, not tax advice. Your plan administrator has the final say on what they accept.

The deadline, and the two things that can extend it

For most employer plans the plan year ends on 31 December. What happens to leftover money depends on which of three arrangements your employer chose, and this is worth checking rather than assuming.

Separately, almost every plan has a run-out period, which is a deadline for submitting claims for expenses you already incurred. Ninety days after the plan year ends is common. These two get confused constantly, so to be clear:

• The grace period extends how long you have to spend.
• The run-out period extends how long you have to file for money already spent.

The practical consequence is the good news in this article. Groceries you already bought this year are probably still claimable, even in January. You do not need to rush out and spend anything. You need to file for what is already in your kitchen cupboard.

Why gluten-free groceries count at all

This surprises people, so it is worth stating plainly. The IRS has treated the extra cost of medically necessary special diet food as a medical expense for decades, in Revenue Ruling 55-261 and Revenue Ruling 76-80, and again in Information Letter 2011-0035.

The rule is narrower than people hope, and the narrowness is the whole point:

• You claim the difference between the gluten-free product and an ordinary equivalent, not the whole price. A $6.49 loaf of gluten-free bread against a $2.92 ordinary loaf is a $3.57 claim, not $6.49.
• It has to be medically necessary, documented by a doctor. Choosing to eat gluten-free does not qualify.
• Food that is naturally gluten-free and costs the same either way, like rice or plain meat, has no premium to claim.

Spread across a year of shopping, that difference is not small. It is simply tedious to work out, which is why most households never claim it.

What you need before the run-out deadline

1. A letter of medical necessity. Start here, today.

This is the piece people underestimate, and it is the reason to act in October rather than December. Your doctor writes a short letter saying a gluten-free diet is medically necessary, for what condition, and for how long.

Some administrators, HealthEquity being the strictest, will not pay for anything you bought before the letter was approved. Others accept a letter covering a dated window. A few want a fresh one every plan year.

If your doctor's office has a patient portal, message them through it. That turns a three week wait for an appointment into a two day wait for a letter, and in October that difference decides whether you make the deadline. We have a template your doctor can sign in about thirty seconds.

2. Your receipts

Itemised grocery receipts showing the gluten-free products. Paper receipts are fine. Emailed or in-app order receipts are better, because the product names are longer and clearer.

3. Proof of the cost difference

This is the part most people have never heard of until a claim is denied. Several administrators want evidence of what the ordinary version costs, not just what you paid.

Ameriflex asks for a "good faith estimate", which they define as a screenshot or photo showing the price of the regular version of the closest comparable product, from any retailer's website. FSAFEDS asks for "documentation of cost difference" without defining the format. Either way, a claim that just lists gluten-free products and their prices is doing half the job.

A realistic timeline from here

If you do not have an FSA

Two things are worth knowing, and neither is a dead end.

An HSA has no deadline at all. If you have one, the money rolls over forever and you can reimburse yourself whenever you like, as long as the purchase came after you opened the account. None of the urgency in this article applies to you.

Open enrollment is your window. It runs from roughly 1 November into mid-December for most employers, and it is the one time each year you can elect an FSA or choose a health plan that makes you eligible for an HSA.

The honest caveat about what this is worth

An FSA reimburses you from money you already set aside pre-tax. If your balance would otherwise be forfeited, a claim is worth the full amount and is close to free money. If you were going to spend that balance on something else anyway, the real benefit is the tax you saved on it.

Both are worth having. They are just different sizes, and anyone telling you otherwise is selling something.

Common questions

Can I claim groceries I bought in January?

If they fall inside the plan year and your administrator's letter rules allow it, usually yes. That is what the run-out period is for. Check whether your administrator requires the purchase to come after the letter was approved, because that is the rule that most often rules out earlier months.

Does the whole grocery bill count?

No, and this is the single most common misunderstanding. Only the extra cost of the gluten-free items, compared against ordinary equivalents.

What if only one person in the house needs the diet?

You claim the products bought for that person. A household of four sharing one loaf of gluten-free bread is a judgement call, and the conservative approach is the defensible one.

Do I need the letter before I shop, or before I file?

It depends entirely on your administrator, and it is the question worth asking them directly. HealthEquity will not pay for purchases dated before the letter was approved. Others accept a letter covering a window, and some only require it at the point you file.