Are air filters, water filters, saunas, and other medical-supply items exempt from Texas sales tax when prescribed by a doctor for chemically-sensitive or allergic patients?
Apply this to your situation
This page answers the general question as of 1994. Ezel answers yours, under current Texas tax law, with citations.
Subject
Water Filters — Prescribed By Physician
Source
- STAR search: https://star.comptroller.texas.gov/search?doc_type_code=L&tax_type_code=SST
- Opinion: https://star.comptroller.texas.gov/view/9407L1306G08
Plain-English Summary
The Texas Comptroller ruled on a batch of products sold by a nonprofit associated with a medical clinic that treats patients with chemical sensitivities and environmental illness. The clinic asked whether various items — many of them recommended or prescribed by doctors to help these patients — qualify for a sales tax exemption. The answers were mixed and turned on the specific product, not on the presence of a prescription alone.
Water Filters — TAXABLE. Despite the letter's overall focus on doctor-prescribed items, water filters got no exemption at all; the Comptroller's one-line response was simply "Taxable."
Other results:
- Air Filters (designed to fit into a central heat/air system) — Taxable.
- Air Purification System (a self-contained unit that purifies the air of an entire room) — Exempt, but only when purchased under a doctor's prescription.
- Saunas — Exempt when purchased under a doctor's prescription accompanied by a letter explaining the patient's condition and how the sauna treats it. If the seller also installs the sauna or hot tub, that installation is treated as an improvement to real property (taxable to the seller as a contractor), and surrounding decking or room enclosures are never exempt.
- Radiant Heaters — Taxable.
- Ecological Masks — Taxable.
The letter also notes that vitamins and supplements were among the products the clinic sold, but the ruling does not give them a separate itemized response.
What This Means For You
If you sell or buy medical/therapeutic equipment in Texas: A doctor's prescription does not automatically make a product exempt. Here, only two of six itemized products (the self-contained air purification system and saunas) could qualify for exemption, and only when a prescription (and, for saunas, a supporting doctor's letter) accompanies the purchase. Water filters, ordinary air filters, radiant heaters, and ecological masks are taxable regardless of a prescription.
If you install saunas, hot tubs, or spas: Be aware that installation work is treated separately from the sale of the unit itself. Installing a sauna or hot tub as a permanent fixture is a real-property improvement, and related building materials (decking, room enclosures) are taxable even when the appliance itself is exempt.
Reliance: This letter is addressed to one specific taxpayer and states expressly that only the addressee may rely on it. If your facts differ even slightly from those described here, the Comptroller could reach a different conclusion — you should request your own ruling rather than relying on this one.
Q&A
Q: Are water filters exempt from Texas sales tax when prescribed by a doctor?
A: No. The Comptroller's response was simply "Taxable" — no prescription exception applies to water filters under this ruling.
Q: Are air filters that fit into a home's central heating/air conditioning system exempt?
A: No, they are taxable, the same as water filters.
Q: Is a self-contained room air purification system exempt?
A: Yes, but only if it is purchased under a doctor's prescription.
Q: Are saunas exempt from sales tax?
A: Yes, if purchased under a doctor's prescription accompanied by a letter from the doctor explaining the patient's condition and how the sauna will treat it. However, if the seller also installs the sauna or hot tub, that installation is a taxable improvement to real property, and items like surrounding decking or room enclosures are not exempt.
Q: Are radiant heaters and ecological masks exempt?
A: No. Both were ruled taxable with no prescription exception.
Q: Does this ruling mean any medically prescribed item is tax-exempt in Texas?
A: No. This ruling shows the Comptroller evaluates each product individually — some prescribed items (like the room air purifier and saunas) can qualify for exemption, while others (like water filters, air filters, radiant heaters, and ecological masks) remain taxable even with a prescription.
Citations
No specific Texas statute or Comptroller rule is cited in the body of this letter. The ruling is an official Comptroller determination on the taxability of listed products and states that it may be relied upon only by the taxpayer to whom it was addressed (consistent with 34 Tex. Admin. Code Rules 3.1 and 3.10, cited in the disclaimer above).
Original ruling text
July 8, 1994
Dear **:
This is written as an addendum to my letter to you dated May
16, 1994, and in response to your letter dated June 24, 1994
and our telephone conversation July 7, 1994.
FACTS: * is a nonprofit organization associated with a
medical clinic that treats patients with environmental
illness, primarily caused by chemical poisoning, whether
through an industrial accident or by the use of chemicals
over an extended time. * sells products that are
specifically designed to meet the needs of these chemically
sensitive and/or extremely allergic patients. The
products include air filters, water filters, saunas,
vitamins and supplements and many other items.
Products in question are restated below with my responses.
Air Filters (a filter designed to fit into a central heat/air
system). RESPONSE: Taxable.
Air Purification System (a self contained unit) - A system
designed to purify the air in an entire room.
RESPONSE: exempt when purchased under a prescription from a
doctor.
Saunas RESPONSE: Exempt when purchased under a
prescription from a doctor and accompanied by a letter from
the doctor explaining the patient's condition and how the
sauna will be used to treat the condition. If the
seller also installs the hot tub or spa, the contract is for
an improvement to realty. Building materials, such as the
surrounding decking or room enclosures, are not exempt.
Water Filters RESPONSE: Taxable.
Radiant Heaters RESPONSE: Taxable.
Ecological Masks RESPONSE: Taxable.
During our telephone conversation you also ask that I
include a statement regarding someone relying on a letter
that was written to another individual or business. Only the
individual or business a letter was written to may rely on a
letter to that particular individual or business.
This opinion is based on the facts you submitted. Other
facts, though similar, may yield different results.
You may call me toll free at 1-800-531-5441, ext. 50330. The
direct line is 512/475-0330. You may also write to Tax
Administration, Comptroller of Public Accounts.
Sincerely,
Bettie Peterson
Tax Administration Division
NOTE: Previous Accession Number 9407433L
Get today's answer for your situation
You just read a 1994 ruling on this question. Ezel checks current Texas tax law and answers your specific situation, with citations.
Opens in Ezel Pro. Every answer cites the authority it relies on.