Which cleanroom facilities and related equipment used in semiconductor (microchip) fabrication qualify for the Texas manufacturing exemption — specifically a chemical analysis lab and equipment air lock, chemical/gas dispense and storage rooms with their safety/cleanroom controls, and an electrical distribution room?

Plain-English summary

A taxpayer asked the Comptroller about the sales and use tax treatment of several cleanroom/fabrication support facilities and their associated equipment used in semiconductor (microchip) manufacturing. The letter first restates the general rule: the Sec. 151.318(q) exemption covers all tangible personal property — whether affixed to or incorporated into realty — used in connection with manufacturing, processing, or fabricating a semiconductor product in a clean room environment. That includes integrated systems, fixtures, piping, and any property necessary or adapted to reduce contamination or control airflow, temperature, humidity, chemical purity, or other environmental conditions or manufacturing tolerances, plus production equipment and machinery. It does NOT include the building itself or a permanent, non-removable component of the building that houses the cleanroom.

Applying that rule to the taxpayer's three described facility types:

1. Chemical Analysis Lab and Equipment Air Lock cleanrooms — used to verify chemical quality before the chemicals enter the fabrication process, and to wipe down equipment to remove particles before it enters the cleanroom. Answer: exempt under Sec. 151.318(q), rooms and equipment both.

2. Chemical/Gas Dispense and Storage Rooms (piping and filters that dispense chemicals and gases directly into fabrication equipment, including piping/filters that produce and distribute ultra-pure water) and Safety/Cleanroom Controls (instrumentation, HVAC controls, detection systems monitoring the cleanroom environment) — Answer: the systems and equipment are exempt under Sec. 151.318(q), but the rooms themselves are not exempt.

3. Electrical Distribution Room containing power systems used exclusively to power semiconductor fabrication equipment — Answer: the electrical power systems are exempt under Sec. 151.318(q) if used exclusively to power fabrication equipment, but the room itself is not exempt.

What this means for you

Semiconductor manufacturers evaluating cleanroom exemption claims

The exemption follows the equipment and systems that actually reduce contamination, control environmental conditions, or serve production — not the room or building shell that houses them. Expect a consistent pattern across facility types: process equipment, piping, filters, and controls integrated into the fabrication process can qualify, while the surrounding room or building structure generally does not.

Businesses with cleanrooms used for pre-fabrication QA or equipment prep

Cleanrooms dedicated to verifying chemical quality before use in fabrication, or to cleaning equipment before it enters the fabrication cleanroom, can themselves qualify for exemption (unlike the dispense/storage and electrical rooms addressed in this letter) because the letter treats them as part of the direct fabrication process.

Businesses with dedicated electrical systems for fabrication equipment

If you can show that specific power distribution equipment is used exclusively to power semiconductor fabrication machinery, that equipment can be exempt even though the room housing it is not.

Common questions

Q: Is a semiconductor cleanroom building itself exempt from Texas sales/use tax?
A: No. The exemption under Sec. 151.318(q) does not include the building or any permanent, non-removable component of the building that houses the cleanroom environment.

Q: Are the piping and filters used to dispense chemicals or gases into fabrication equipment exempt?
A: Yes, the systems and equipment are exempt under Sec. 151.318(q), but the room that houses them is not.

Q: Is electrical equipment used to power fabrication machinery exempt?
A: Yes, if it is used exclusively to power equipment used in the semiconductor fabrication process — but the electrical distribution room itself is not exempt.

Q: Can I rely on this letter for my own facility?
A: No. Letters on STAR are based on the specific facts submitted by the requesting taxpayer and can be the basis of a detrimental reliance claim only for that taxpayer; consult a licensed Texas tax professional about your own situation.

Citations and references

Statutes and rules:

• Tex. Tax Code Sec. 151.318(q) (exemption for semiconductor fabrication cleanroom property and equipment)

Source

• STAR search: https://star.comptroller.texas.gov/search?doc_type_code=L&tax_type_code=SST
• Opinion: https://star.comptroller.texas.gov/view/9602220L

Original ruling text

February 16, 1996

Dear **:

You asked about sales and use tax treatment of various cleanroom/fabrication
support facilities and associated equipment.

The exemption for semiconductor fabrication cleanrooms and equipment includes
all tangible personal property whether it is affixed to or incorporated into
realty and used in connection with manufacturing, processing, or fabricating in
a clean room environment of a semiconductor product. It includes integrated
systems, fixtures and piping and all property necessary or adapted to reduce
contamination or to control airflow, temperature, humidity, chemical purity or
other environmental conditions or manufacturing tolerances and production
equipment and machinery. It does not include the building or a permanent non-
removable component of the building that houses the cleanroom environment.

I have restated your descriptions below.

1. Chemical Analysis Lab-Cleanrooms used to verify the quality of chemicals
   used directly in semiconductor fabrication. The analysis is done before the
   chemicals are introduced into the semiconductor fabrication process and is a
   necessary and essential process to semiconductor fabrication.

Equipment Air Lock-Cleanrooms where equipment is wiped off to remove particle
matter before it is brought into the semiconductor fabrication cleanroom
environment.

Answer 1. These cleanrooms and associated equipment are exempt under Sec.
151.318(q).

2. Chemical Dispense and Storage Rooms-Rooms where chemicals that are used
   directly in semiconductor fabrication are dispensed and piped directly into
   semiconductor fabrication equipment. These rooms contain piping and filters.

Gas and Dispense and Storage Rooms-Rooms where gases that are used directly in
semiconductor fabrication are dispensed and piped directly into semiconductor
fabrication equipment. These rooms contain piping and filters used to produce
and distribute ultra pure water required in the semiconductor fabrication
process.

Safety/Cleanroom Controls-Instrumentation, HVAC Controls, and detection
systems that are used to monitor and control the cleanroom environment.

Answer 2. These systems and associated equipment are exempt under Sec.
151.318(q). The rooms do not fall under the exemption.

3. Electrical Distribution Room-This room contains electrical power systems
   that are used exclusively to provide power to equipment used in the
   semiconductor fabrication process.

Answer 3. The electrical power systems will qualify for exemption under Sec.
151.318(q) if used exclusively to power equipment used in the semiconductor
fabrication process. The room does not fall under the exemption.

I hope this satisfactorily answers your questions. Should you have additional
questions, please contact me at 111 E. 17th Street, Austin, Texas 78774, or
call me at 1-800-531-5441, extension 3-4004.

Sincerely,

Wade Anderson
Director, Tax Policy

cc: Karey Barton, Manager, Tax Policy and Research