For a Texas-based interstate trucking company, does it matter whether repair parts are bought in-state or out-of-state, and whether they go on the tractor (truck) versus the trailer?

Plain-English summary

A Texas-headquartered interstate trucking company, licensed as a common carrier and registered in roughly 40 states, ran through a detailed set of questions about the tax treatment of repair parts, lubricants, tires, and warranty work performed at its Texas maintenance facility, on both tractors (the self-propelled truck portion of a rig) and trailers.

The answers hinge on two distinctions working together -- where the part was bought and what it's installed on:

• Repair/replacement parts (including tires and tubes) bought OUTSIDE Texas and installed in Texas on the self-propelled vehicle (the tractor) are exempt from use tax, under Rule 3.297(a)(2) and Tax Code Section 151.330(i).
• That exemption is limited to the self-propelled vehicle -- it explicitly does not cover trailers and semi-trailers.
• Parts bought IN Texas and installed in Texas are taxable, full stop -- the exemption is a use-tax exemption for out-of-state purchases, not a general parts exemption. A Texas vendor (or an out-of-state vendor with Texas nexus) delivering from a Texas location must collect Texas sales tax regardless of where the part ends up being used.
• Lubricants (oil, grease) are always taxable, wherever purchased -- the exemption covers only parts actually "affixed" to the vehicle, and lubricants don't qualify as affixed repair/replacement parts.
• Labor to repair a motor vehicle (including trailers and semi-trailers) is not taxable -- so a warranty repair with parts provided at no separate charge and only labor billed generates no tax at all.
• The taxpayer separately asked whether this out-of-state/in-state distinction unfairly disadvantages Texas parts vendors. The Comptroller declined to weigh in on that policy question, noting it's the Legislature's or the courts' call, not the administering agency's -- a useful reminder that letter rulings answer "what does the law require," not "is the law good policy."

What this means for you

Interstate trucking companies and common carriers with Texas maintenance operations

Track your parts purchases by both origin (in-state vs. out-of-state vendor) and destination (tractor vs. trailer) -- these two facts together determine whether use tax applies. Buying parts out-of-state for tractor installation is your only path to the use-tax exemption; the same parts installed on a trailer, or bought from a Texas vendor, are taxable.

Fleet maintenance managers

Lubricants are taxable no matter what, and warranty labor (with no separately charged parts) is not taxable -- two simple rules worth building into your purchasing/accounting workflows regardless of the more complex tractor/trailer distinction.

Accountants and tax professionals

A clean worked-example letter distinguishing a narrow use-tax exemption (151.330(i)/Rule 3.297(a)(2), out-of-state parts on self-propelled vehicles only) from the general sales-tax rule for in-state purchases, plus a reminder that the Comptroller won't adjudicate policy fairness arguments about the law's design.

Common questions

Q: Are repair parts for a truck's tractor exempt from tax?
A: Only if bought outside Texas and installed in Texas -- that's a use-tax exemption, not a blanket exemption on tractor parts generally.

Q: Does the exemption cover trailers too?
A: No, only the self-propelled vehicle (tractor); trailers and semi-trailers are excluded.

Q: Are lubricants like oil and grease covered by this exemption?
A: No, they're always taxable regardless of where purchased.

Q: Is labor to repair a truck or trailer taxable?
A: No, labor to repair a motor vehicle (including trailers/semi-trailers) is not taxable.

Q: Can I rely on this letter for my own trucking operation?
A: No. It is based on the specific facts presented and can only be relied on by the taxpayer to whom it was issued.

Citations and references

Statutes and rules:

• Texas Tax Code Section 151.330(i) (use tax exemption for common carrier repair/replacement parts)
• 34 Tex. Admin. Code Rule 3.297(a)(2) (Carriers)

Source

• STAR search: https://star.comptroller.texas.gov/search?doc_type_code=L&tax_type_code=SST
• Opinion: https://star.comptroller.texas.gov/view/9906485L

Original ruling text

June 1, 1999

Dear **:

Thank you for your letter concerning sales and use tax on purchases by a common
carrier.

Facts: The Texas taxpayer is a trucking company performing interstate
commerce. They hold themselves out for hire in transporting goods for
customers throughout Texas and other states. They are registered in Texas, and
approximately 40 other states, as an interstate motor carrier. The taxpayer
maintains their corporate headquarters and a maintenance facility in Texas.
The taxpayer purchases items for use on the tractor, the motor vehicle portion
of the rig, and the trailers used to transport these goods.

Questions:

1) Are the repair parts purchased by your client taxable if purchased for use
on the tractor and/or trailer? These would include tangible items such as
filters, brakes, belts, etc., purchased from both Texas and out of state
vendors for installation at the maintenance facility in Texas.

Response: Repair and replacement parts, including tires and tubes, acquired
outside Texas and affixed in Texas to a self-propelled vehicle that is a
licensed and certificated common carrier are exempt from tax. Trailers and
semi-trailers are not included. Repair and replacement parts purchased in
Texas and affixed in Texas are taxable. See subsection (a)(2) of Rule 3.297,
Carriers (enclosed).

2) Are the lubricants, such as oil and grease, used on the tractor taxable?

Response: Yes. The exemption from use tax in Rule 3.297(a)(2) is for repair
or replacement parts affixed to the self-propelled vehicle.

3) Are the purchases of tires installed on the tractors and trailers taxable?
These would include replacement tires as well as new tires.

Response: See the response to question one above.

4) Parts, installed under a warranty by a dealer as a repair, taxable to your
client? There is no charge for the parts on the invoice, only the labor to
install.

Response: The labor to repair a motor vehicle, including trailers and
semi-trailers, is not taxable. The labor to repair equipment that does not
meet the definition of a motor vehicle is taxable.

5) In regards to Rule 3.297(a)(2), the section states "use tax is not due on
repair or replacement parts acquired outside this state and actually affixed in
this state to a self-propelled vehicle that is used as a licensed and certified
common carrier". Would this discriminate against Texas vendors and put those
vendors at a pricing disadvantage? Would it require the Texas vendor to charge
your client sales tax or your client to accrue use taxes on the purchases?

Response: The exemption in Texas Tax Code Section 151.330(i) is for "use" tax
rather than "sales" tax. A Texas vendor (or out-of-state vendor engaged in
business in Texas) that ships or delivers the repair or replacement part from a
location in Texas to a customer at a location in Texas is required to collect
the "sales" tax. Whether the law is discriminatory or puts Texas vendors at a
pricing disadvantage is a question to be settled by either the Texas
Legislature or the courts rather than the state agency that administers the
tax.

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. 5-0030. The direct line is
512/475-0030. You may also write to Tax Policy, Comptroller of Public
Accounts.

Sincerely,

David Somerville
Tax Policy Division