Is renting carbon absorption units used to treat recovered ground water taxable, or is it a nontaxable remediation service?

Plain-English summary

A company that provides carbon absorption systems for ground water remediation asked the Comptroller how the arrangement should be taxed. Carbon absorption units are placed on customer premises to remove hydrocarbon compounds from recovered ground water — the carbon absorbs the organic solute molecules until the carbon becomes exhausted and must be regenerated or disposed of.

The Comptroller ruled that even though the units physically stay on the customer's premises, the customer is not renting equipment. Instead, the customer is buying a nontaxable remediation service. That means the company supplying the units (referred to in the letter as "*") owes sales tax when it purchases the carbon units itself, but it does not collect sales tax from its customers on the remediation service charge.

The letter also addresses a variation: if the company instead hires a third party to supply and regenerate the units, that third-party service company owes tax on the units when it buys them, and the original company would not owe tax on the charge it pays the third party for that service.

The Comptroller noted this answer is based on the facts as presented, and that other, similar facts could lead to a different result.

What this means for you

Environmental remediation companies

If you provide carbon absorption units (or similar treatment equipment) that stay on a customer's site while you handle the treatment process — supplying, monitoring, and regenerating or replacing the carbon — this letter supports treating the arrangement as a nontaxable service rather than equipment rental. You pay sales tax when you buy the carbon units, but you do not need to charge your customers sales tax on your remediation service fee.

Businesses that outsource remediation to a third party

If you hire another company to supply and regenerate carbon units for your remediation systems, this letter indicates that the third-party service company owes tax on the units when it purchases them, and you would not owe sales tax on what you pay that third party for its service.

Accountants and tax professionals

This letter turns on the key distinction in Texas sales tax law between a taxable rental of tangible personal property and a nontaxable service, even when the underlying equipment remains on the customer's premises. The Comptroller's reasoning here is that the customer's arrangement is really the purchase of a treatment/remediation outcome, not the right to possess or control specific equipment — so tax is collected further up the chain, when the units themselves are purchased, rather than on the ultimate service charge. Because the letter does not cite a statute, it's best used as a factual analogue rather than as authority for the general legal test.

Common questions

Q: Is a company renting carbon absorption units to customers when it leaves them on-site for remediation?
A: No. The Comptroller ruled that even though the units are left on the customer's premises, the customer is buying a nontaxable remediation service, not renting equipment.

Q: Who pays sales tax in this arrangement?
A: The company supplying the carbon units pays sales tax when it buys the units. It does not charge its customers sales tax on the remediation service.

Q: What if a third party is hired to supply and regenerate the units instead?
A: The third-party service company owes tax on the units when it buys them, and the original company would not owe tax on the charge from the third party for that service.

Q: Does this ruling cite a specific statute?
A: No. The letter does not reference any statute or administrative rule by number — it simply states the Comptroller's conclusion based on the facts presented.

Q: Can I rely on this exact letter for my own business?
A: This letter can only be relied on by the taxpayer who received it, and the Comptroller notes that other, similar facts could produce a different answer. If your situation involves similar remediation equipment left on customer sites, this letter is a useful reference point, but you should confirm current treatment with a tax professional.

Citations and references

The original letter does not cite any specific statute or rule by number.

Source

• STAR search: https://star.comptroller.texas.gov/search?doc_type_code=L&tax_type_code=SST
• Opinion: https://star.comptroller.texas.gov/view/9404L1296E09

Original ruling text

April 7, 1994

Dear **:

Thank you for the description of carbon absorption systems.

These systems are used as components in remediation systems
for the treatment of recovered ground water. Carbon units
absorb hydrocarbon compounds found in the water through
physical attraction of organic solute molecules to the
surfaces of the individual carbon grains. The absorption
process continues until equilibrium is established between
the carbon and the solute. The exhausted carbon system must
be regenerated for future use or disposed of in accordance
with regulations.

Although the units are left on your customers' premises,
your customers are not renting the units, they are buying a
nontaxable remediation service. * should pay tax on the
units when it buys them.

If you hire a third party to supply and regenerate the
units, that service company will owe tax on the units when
it buys them. In that case, * would not owe tax on the
charge from the third party for this service.

This answer is based on the facts as presented. Other facts,
although similar, may result in a different answer.

If you have any questions or need information, my number is
I-800-531-5441 ext. 3-4614. Or you may write to the Tax
Administration Division.

Sincerely,

Adina Whittemore
Tax Administration Division

NOTE: Previous Accession Number 9404269L