Are Saunas HSA or FSA Eligible?
Saunas are HSA/FSA eligible with a Letter of Medical Necessity (LMN) for a specific health condition. The logic comes from IRS Publication 502, which defines medical expenses as "the costs of diagnosis, cure, mitigation, treatment, or prevention of disease." The same sauna can be a general-wellness splurge (not eligible) or documented medical care for a specific condition like hypertension, chronic pain, or fibromyalgia (eligible). To cross that line you need a Letter of Medical Necessity from a licensed provider recommending heat therapy for your condition. That letter works for a health savings account and a standard full-purpose FSA. Our HSA vs FSA guide covers how the two account types compare.
Why Sauna Is Actually Medicine (The Science)
Heat therapy gives a provider a medical reason to recommend sauna use for a health condition. Finland is a useful place to look: researchers have followed regular sauna bathers there for decades.
The cardiovascular findings are the strongest. In a 20-year study of 2,315 middle-aged Finnish men, sauna use 4 to 7 times a week was associated with a 63% lower risk of sudden cardiac death than once-weekly use. Lower fatal cardiovascular disease and all-cause mortality followed the same pattern. In a hypertension analysis of 1,621 men without high blood pressure at baseline, bathing 4 to 7 times a week was linked to a 46% lower risk than once-weekly bathing over roughly 25 years. That held after adjustment for age, smoking, body mass index and systolic blood pressure. A separate study of 1,628 men and women linked frequent sauna use to a 61% lower stroke risk compared with once-weekly use. These were observational studies, so the findings show associations rather than cause and effect.
The research also reaches the brain, pain, and mood. Finnish men who bathed 4 to 7 times weekly had a 65% lower risk of Alzheimer's disease than once-weekly users in a two-decade observational follow-up. In 13 women with fibromyalgia, far-infrared sauna followed by warm rest was associated with lower pain scores after the first session and repeated sessions. A randomized, double-blind trial of whole-body hyperthermia for major depression found lower depression scores than a sham session across six weeks; 29 participants contributed follow-up data. A systematic review of 40 studies involving 3,855 participants found potential benefits, with many studies small and protocols varied.
Which Type of Sauna Is HSA or FSA Eligible?
Every major type of sauna qualifies on the same terms: eligible with an LMN, regardless of format or price. What matters is the medical purpose, not whether the heat comes from an infrared panel, hot stones, or a fold-up tent. The table below compares the five common categories.
| Sauna type | HSA/FSA status | Practical difference | Typical price (estimate; varies by brand and size) |
|---|---|---|---|
| Traditional sauna | Eligible with LMN | Heats the air around you; the format used in the Finnish cohort studies | About $3,000 to $15,000 |
| Infrared sauna cabin | Eligible with LMN | Radiant heat in a dedicated cabin | About $1,500 to $8,000 |
| Red-light sauna (red light + infrared) | Eligible with LMN | Combines light panels and infrared heat in one cabin | About $4,000 to $9,000 |
| Sauna blanket | Eligible with LMN | A foldable, one-person wrap that needs less space than a cabin | About $200 to $500 |
| Portable/tent sauna | Eligible with LMN | A collapsible enclosure; heating method depends on the model | About $200 to $1,000 |
Traditional saunas run the hottest, roughly 150 to 195°F, and carry the deepest cardiovascular research.
Infrared saunas heat your body directly at a lower air temperature, around 110 to 135°F, which many people tolerate for longer sessions.
Red-light saunas pair red-light panels with infrared heat in one cabin, the same category as a standalone red-light face or panel device.
Sauna blankets deliver that infrared heat in a foldable, one-person wrap for a fraction of a full cabin's cost.
HigherDose makes an at-home infrared sauna blanket.
Portable and tent saunas are fold-up, single-person enclosures you can pack away between sessions.
Medical Conditions That Qualify Sauna for HSA/FSA Eligibility
These are some of the conditions a provider can connect to sauna therapy in your LMN. The benefit differs by condition: heat can help with pain and stiffness, while cardiovascular studies also examine prevention. Your provider decides whether sauna use fits your health and medications.
- Hypertension: Heat changes blood flow and blood-vessel function. A long-term study associated frequent sauna use with a lower risk of developing high blood pressure.
- Cardiovascular disease: Finnish cohort research links frequent sauna bathing with fewer fatal cardiovascular events. For heart failure, studies of supervised heat therapy have examined exercise capacity and symptoms.
- Fibromyalgia: A small study of far-infrared sauna and warm rest reported reduced pain.
- Rheumatoid arthritis and ankylosing spondylitis: An infrared-sauna pilot study found short-term relief of pain and stiffness during sessions.
- Chronic back pain: Cleveland Clinic describes how increased blood flow and fewer muscle spasms can help with pain.
- Depression: A controlled whole-body heat trial found improvement in depression scores after one session.
- Cognitive decline: Long-term observational research links frequent sauna use with lower dementia and Alzheimer's risk.
- Type 2 diabetes: A small infrared-sauna study found improvements in quality of life, stress and fatigue; it did not establish better blood-sugar control.
- Chronic fatigue syndrome: Small studies reported symptom improvements, but one also found heat intolerance, so talk with your provider about whether heat therapy suits you.
Conditions not listed here can count too when your provider connects sauna therapy to their prevention or management in your letter.
How to Get a Letter of Medical Necessity for a Sauna
You have two ways to get your sauna letter, whether you want a home unit or studio sessions.
- Through Crates, typically in under 24 hours. Take a 2-minute online health assessment. A licensed provider reviews your answers and, if you qualify, issues your sauna letter. Your Crates letter covers 12 months. If you have a subscription or keep buying the product, we remind you before your letter ends, and renewing your letter takes one tap. A one-time purchase needs no letter renewal. Crates plans start at $39 a year for one product's letter; Unlimited is $99 a year.
- Through your own doctor, a few days to a few weeks. Book a visit and explain that you want to use HSA/FSA funds for a sauna. Ask your doctor to document how heat therapy helps prevent, manage, or reverse your condition. The letter should be signed and dated. You may owe a copay.
How to Buy a Sauna With HSA/FSA Funds
Choose the sauna or studio you want, then use your letter and receipt to get your money back. You can buy anywhere.
- Get your Letter of Medical Necessity first. Use Crates or your own doctor, as explained above.
- Buy with your personal card. Keep an itemized receipt showing the sauna or sessions and the amount paid. Save installation invoices separately.
- Get your money back. Crates one-click reimbursement files the claim for you, or upload the letter and receipt yourself. For an HSA, keep both with your tax records.
Crates guidance is that your letter covers purchases from its issue date forward. Already bought the sauna? A new letter will not reach back to that purchase; get the letter before your next eligible purchase. HSA expenses must also fall after the account was established, and health FSA expenses within your coverage period, as Publication 969 explains.
The Hidden Cost of Heat Therapy
If you are serious about sauna therapy, you are spending serious money. A cabin is a bigger one-time outlay than a blanket, and studio prices depend on where you go and how many sessions you buy.
Prices vary by city. A single infrared sauna session at a studio often runs about $25 to $60, and monthly memberships about $75 to $200, depending on how many sessions are included; home units run from about $200 for a sauna blanket to about $15,000 for a built-in traditional sauna (estimates). With an eligible purchase, pre-tax HSA/FSA dollars can help you keep more of your money. At a combined tax rate near 30%, an illustrative $3,000 sauna purchase saves $900 in taxes. The combined rate can include federal, state and payroll taxes where applicable. The retailer still charges $3,000; reimbursement uses your own account funds.
Each figure below is the example purchase price multiplied by the illustrated combined tax rate. These are budgeting examples, not current offers.
| Example eligible purchase | At 20% combined tax rate | At 30% combined tax rate |
|---|---|---|
| $700 | $140 | $210 |
| $3,000 | $600 | $900 |
| $5,000 | $1,000 | $1,500 |
Your actual savings depend on your taxes and how you contribute. Letter or provider fees are separate.
What Sauna Expenses Are HSA/FSA Eligible
With an LMN in hand, a wide range of sauna spending qualifies. On the sessions side, that covers single sessions and studio memberships used for documented medical care. On the equipment side, it covers cabins, sauna blankets and portable units. A sauna is judged like other recovery tools: eligible with a Letter of Medical Necessity for a specific condition.
For a permanent home improvement, Publication 502 counts the medically necessary cost minus any increase in your property's value. Keep the sauna, electrical work and other installation costs itemized. General remodeling for appearance or convenience is separate.
For a family membership, the documented member's share is what qualifies; a spouse or dependent with their own letter adds theirs. For an FSA, claim sauna sessions as they happen: paying ahead for next year's visits does not make them this year's medical expenses.
Use an HSA or a full-purpose health FSA for sauna spending. Limited-purpose FSAs cover dental and vision care, and dependent-care FSAs cover care expenses, so neither pays for a sauna or sessions.
