How does Texas sales tax apply to an arborist's oak-wilt treatment — both the taxable chemical injection/spraying and a concrete root-barrier trench built to stop the disease from spreading?

Plain-English summary

An arborist or landscaping contractor asked the Comptroller how sales tax applies to controlling oak wilt disease, which can be fought two ways: chemical treatment/injection of the trees, and digging a trench filled with concrete to physically separate infected trees from healthy ones (blocking root-to-root disease transmission). The Comptroller split the answer:

• Chemical treatment is taxable. Spraying or injecting chemicals to treat oak wilt is a taxable real property service under Rule 3.356, and the charge for it must be stated separately from the barrier work and taxed.
• The concrete barrier is a nontaxable realty improvement. Because it's permanently attached to the property, it counts as hardscape and a new improvement to realty — so the labor to install it is not taxable. The materials (the concrete itself) are taxed depending on the type of contract:
  • Lump-sum contract: the contractor is treated as the consumer of the materials and must pay tax to its own suppliers when it buys them (or accrue tax on materials pulled from a tax-free inventory); the customer's lump-sum charge is not separately taxed.
  • Separated contract: the contractor is treated as the seller of the incorporated materials and must collect tax from the customer on the materials charge (which must be at least the contractor's purchase price); the contractor can then buy those materials tax-free from its own suppliers using a resale certificate, though it still owes tax on consumable supplies and equipment (e.g., a trencher) used on the job.

This tax treatment is the same regardless of whether the work is done by the arborist directly, a subcontractor, a developer, or is contracted for by an individual homeowner, a group of neighbors, or a taxable homeowners association.

What this means for you

Arborists and tree-service contractors

If you offer both chemical oak-wilt treatment and physical barrier construction, bill them as separate line items — the chemical treatment is always taxable as a real property service, while the barrier's tax treatment depends on your contract structure. Decide up front whether your contract with the customer is lump-sum or separated, since that determines whether you pay tax to your suppliers (lump-sum) or collect it from your customer (separated) on the concrete and other incorporated materials.

Homeowners, HOAs, and neighbor groups managing oak wilt outbreaks

Whether you're one homeowner or part of a group project, expect the chemical treatment portion of your bill to carry sales tax. The barrier construction's materials cost may or may not show tax separately depending on how your contractor structures the contract — ask which type of contract you're signing if you want to understand your invoice.

Accountants and tax professionals

This is a useful illustration of the lump-sum vs. separated contract distinction under Rule 3.356 applied to a mixed service (taxable real property service plus nontaxable-labor realty improvement) — the same framework recurs across many Texas contractor rulings, so it's a good reference point for similar mixed-scope-of-work questions.

Common questions

Q: Is chemical treatment for oak wilt taxable in Texas?
A: Yes. Spraying or injecting chemicals to treat oak wilt disease is a taxable real property service under Rule 3.356, and it must be separately stated from any barrier-construction charges.

Q: Is a concrete root barrier used to stop oak wilt from spreading taxable?
A: The labor to install a permanent concrete barrier is not taxable, since it's a new improvement to realty. The materials are taxed depending on whether the contract is lump-sum (contractor pays tax to its suppliers, no separate tax to the customer) or separated (contractor collects tax from the customer on the materials charge).

Q: Does it matter who hires the contractor — one homeowner, a group of neighbors, or an HOA?
A: No — the letter states the tax treatment is the same regardless of whether the customer is an individual, a group of neighbors, a taxable homeowners association, a subcontractor, or a developer.

Citations and references

Statutes and rules:

• 34 Tex. Admin. Code Rule 3.356 (Real Property Service)

Source

• STAR search: https://star.comptroller.texas.gov/search?doc_type_code=L&tax_type_code=SST
• Opinion: https://star.comptroller.texas.gov/view/200007543L

Original ruling text

July 31, 2000

Dear **:

Thank you for your recent letter concerning concrete barriers used to contain
the spread of oak wilt disease.

The chemical treatment of oak wilt disease is a taxable real property service
per Rule 3.356. Oak wilt disease can also be contained by digging a trench
separating infected trees from healthy trees. The trench is filled with
concrete to create a barrier that stops the movement of the disease between
tree roots.

The concrete barrier that is permanently attached to a customer's property is
considered hardscape and is an improvement to realty. As a new permanent
improvement to realty, the labor to install the barrier is not taxable. The
materials incorporated into the realty (e.g., concrete) are taxed in accordance
to the type of contract between the arborist and the customer. The taxable
chemical or other treatment to the trees should be separately stated from
charges for the barrier and taxed.

Under a lump-sum contract, the contractor is considered the consumer of all
materials incorporated into the realty, consumable items, and equipment
purchased or leased to perform the contract. As the consumer, the contractor
must pay tax to suppliers at the time the materials are purchased or accrue tax
on materials removed from a valid tax-free inventory. No tax is due on the
lump-sum charge to the customer.

Contractors performing separated contracts are considered sellers of all
materials physically incorporated into the realty being improved. As a seller,
the contractor must collect tax from the customer on the charge for the
incorporated materials. The agreed contract price of the materials must be
equal to or exceed the purchase price of the materials. Again, no tax is due on
the labor charge. A separated contractor may purchase materials incorporated
into the customer's realty tax free by issuing a resale certificate to
suppliers. The contractor still owes tax on the purchase or rental of
consumable supplies and equipment used to perform the job (i.e., trencher).

The above answer remains the same even if performed by a subcontractor or
developer or contracted for by a single individual, group of neighbors or
taxable homeowners association.

This opinion is based on the facts presented. If there are additional or
different facts, the opinion may change.

You may call me toll free at 1-800-531-5441, ext. 5-0613. The direct line is
512/475-0613. You may also write to Tax Policy Division, Comptroller of Public
Accounts.

Sincerely,

Kevin Koller
Tax Policy Division