Can You Use Your HSA or FSA for a Gym Membership?

The IRS answers this question by name, in its FAQ on medical expenses related to nutrition, wellness and general health. Asked whether a gym membership can be paid or reimbursed by an HSA, FSA, Archer MSA or HRA, it says:

“Yes, but only if the membership was purchased for the sole purpose of affecting a structure or function of the body (such as a prescribed plan for physical therapy to treat an injury) or the sole purpose of treating a specific disease diagnosed by a physician (such as obesity, hypertension, or heart disease). Otherwise, the cost of a gym membership is for the general health of the individual and is not a medical expense.”

Read it twice and the test is narrower than it first looks. It is not “a purpose”, it is the sole purpose. A membership you would have bought anyway, which you now also use for a condition, was not bought for the sole purpose of treating it. That is why the third question in the checker above asks whether you would be paying for the gym without the diagnosis — it is the only form of the sole-purpose question a reader can answer about themselves.

Underneath that sits the definition the whole thing rests on. Medical expenses, the IRS says, are “the costs of diagnosis, cure, mitigation, treatment, or prevention of disease, and for the purpose of affecting any part or function of the body”, they “must be primarily to alleviate or prevent a physical or mental disability or illness”, and they “don’t include expenses that are merely beneficial to general health”. Fitness is beneficial to general health. That last clause is what rules out most gym memberships, and it rules them out however genuinely someone wants to get healthier.

Publication 502 — the list both the HSA and the health FSA rules point at — is blunter still: “You can't include in medical expenses health club dues or amounts paid to improve one's general health or to relieve physical or mental discomfort not related to a particular medical condition.” And in the weight-loss section, where you would most expect an opening, it closes one and opens another: “You can't include membership dues in a gym, health club, or spa as medical expenses, but you can include separate fees charged there for weight loss activities.”

A letter of medical necessity is a letter from the treating physician setting out the diagnosis, the treatment being recommended, and why that treatment treats that condition. It is worth being clear about what it is not: “letter of medical necessity” is not an IRS term, no IRS form prescribes its contents, and the IRS does not say anywhere that having one makes an expense eligible.

The IRS rule is about the purpose of the expense, and nothing else. A letter cannot turn a general-fitness membership into a medical expense, and no amount of paperwork will. What a letter does is substantiate a claim — it is how you show that the purpose test was met, if anyone asks. Separately, a plan administrator may require documentation of its own under its claims process before it will pay. Those are two different things: one is evidence of eligibility, the other is a condition the plan imposes. Neither creates eligibility.

Which means the letter’s job is narrow and specific: make the sole-purpose test visible to whoever reads it. A letter that says “exercise would benefit this patient” actively hurts the claim, because benefiting general health is the exclusion. These are the elements plans look for.

LETTER OF MEDICAL NECESSITY

Date: ____________________

To: Plan Administrator, [name of HSA / health FSA administrator]
Re: [Patient full name], date of birth [__/__/____]
Member / account ID: ____________________

I am the treating physician for the patient named above.

DIAGNOSIS
I have diagnosed this patient with [specific condition], ICD-10 code [______],
diagnosed on [date of diagnosis].

TREATMENT RECOMMENDED
To treat that condition I am recommending the following:
[describe exactly what is being recommended - for example, a supervised
exercise programme at a fitness facility, a specific number of sessions per
week with a qualified trainer, or a named medically supervised weight-loss
programme]

HOW THIS TREATS THE CONDITION
[Explain in one or two sentences how the recommended activity treats this
specific condition - for example, how a supervised programme is being used to
reduce blood pressure, manage diagnosed obesity, or rehabilitate a named
injury.]

SOLE PURPOSE
I am recommending this treatment for the sole purpose of treating the condition
diagnosed above. It is not being recommended for the patient's general health,
general fitness, or general wellbeing.

DURATION
This recommendation applies from [start date] to [end date], a period of
[number] months, after which the patient's condition and this recommendation
should be reassessed.

PROVIDER
Name: ____________________________________
Credentials: ______________________________
Practice name: ____________________________
Address: __________________________________
Phone: ____________________________________
NPI (if applicable): ______________________

Signature: ________________________________   Date: ______________

There are two ways pre-tax money reaches a medical expense, and they are not worth the same. Money taken out of your pay — a health FSA always, an HSA when the employer runs one through a cafeteria plan — never enters the wages reported in boxes 1, 3 and 5 of your W-2. Publication 969 says of the employer side that “Amounts you contribute to your employees' HSAs aren't generally subject to employment taxes.”, and an amount you elect through a cafeteria plan counts as an employer contribution. So it escapes income tax and Social Security and Medicare.

Money you move into an HSA yourself, from an account you have already been paid into, is a deduction rather than an exclusion. Publication 969 confirms you get it without itemising — “You can claim a tax deduction for contributions you or someone other than your employer make to your HSA … even if you don't itemize your deductions on Schedule A (Form 1040)” — but the wages were already taxed for Social Security and Medicare when they were paid, and nothing gives that back. On a $600 a year membership for a mid-income earner, that difference is roughly the price of a month of the membership.

The payroll advantage also has a ceiling that most calculators miss. Social Security stops at the $184,500wage base, so for anyone earning above it the payroll saving on pre-tax money is Medicare only — 1.45%, plus the 0.9% Additional Medicare surtax, rather than the 7.65% a flat rate would suggest. The calculator above handles this by pricing the whole return twice and reporting the difference, which is why its payroll line can read $0 on a high salary while the federal line is large.

With a health FSA the downside is contained: the administrator refuses the claim and you have simply paid for the gym yourself. If a card payment has already gone through you will be asked to substantiate it or repay the plan, and an amount that is never resolved can end up added to your taxable wages.

An HSA is harsher, because the money left the account before anyone checked. A distribution that did not pay a qualified medical expense is added to your income and, says Publication 969, “the amount you withdraw will be subject to income tax and may be subject to an additional 20% tax”. The additional tax has three exits — “There is no additional tax on distributions made after the date you are disabled, reach age 65, or die.” — and reaching 65 is the one most people are counting on. Note what survives all three: the income tax. After 65 a non-medical withdrawal is taxable like a traditional IRA withdrawal, which is a worse outcome than never having claimed the gym at all.

This asymmetry is the practical argument for sending the letter to the administrator first even though an HSA has no pre-approval step. An FSA tells you the answer before the money moves. With an HSA you find out afterwards, on a Form 8889 you have already filed.