Does a construction contract's two-year warranty period extend the time during which the contract can be renegotiated for tax purposes, and is a signed written contract required to support a tax-exempt sale to a church?

Plain-English summary

This 1993 Texas Comptroller letter answers two short "yes or no" questions from a contractor about sales tax treatment of construction contracts.

Question 1 — Does a warranty period extend the time to renegotiate a contract? The taxpayer asked whether a contract could still be renegotiated to change its tax treatment during a two-year warranty period included in the contract's specifications, on the theory that the contract wasn't really "completed" until the warranty period ended. The Comptroller's office said no — a contract is completed once the actual construction work called for in the contract is finished. The warranty period that follows does not extend the period during which the contract can be renegotiated for tax purposes.

Question 2 — Is a signed contract required to support a church's tax exemption? The taxpayer also asked whether, for new construction done for an exempt church, a written bid that separates labor and material charges — combined with the church's exemption certificate and a verbal notice to proceed (but no signed contract) — would be enough evidence to relieve the contractor from paying sales tax on the materials. The Comptroller's office said yes — in the absence of a formal written contract, a written bid, written invoice, or other written documentation is treated as the contract.

The letter closes with the Comptroller's standard caveat that the opinion is based on the facts presented and could change if the facts are different.

What this means for you

Construction contractors

If you're relying on the ability to renegotiate a contract to change its sales tax treatment, that window closes once the actual construction work is physically complete — a warranty period tacked onto the end of the job does not buy you extra time to renegotiate. Separately, if you're building for a tax-exempt entity like a church, you don't necessarily need a signed contract to support the materials exemption: a written bid or invoice that separates labor and materials, paired with the exemption certificate, can serve as your documentation if the customer only gives verbal notice to proceed.

Accountants and tax professionals

This letter is useful for two narrow, practical points that often come up in construction-contract sales tax planning: (1) "contract completion" for renegotiation purposes is tied to completion of the physical construction work, not to the end of any warranty period; and (2) a separated (labor vs. materials) written bid or invoice can substitute for a signed contract when documenting an exempt sale, as long as an exemption certificate is also on file.

Common questions

Q: Can a contractor renegotiate a construction contract's tax treatment during the warranty period?
A: No. According to this ruling, the contract is considered complete once the actual construction work is finished, not when the warranty period ends. The warranty period does not extend the time available to renegotiate the contract for tax purposes.

Q: Do I need a signed, formal contract to support a sales tax exemption on materials sold to an exempt organization like a church?
A: Not according to this ruling. If there's no formal written contract, a written bid, written invoice, or other written documentation (together with the customer's exemption certificate) is treated as the contract and can support the exemption.

Q: Does this ruling cite any specific statutes or rules?
A: No statutes or rules are cited in this letter.

Q: Can I rely on this letter for my own transaction?
A: This is a STAR letter ruling addressed to a specific taxpayer based on the facts they presented. Under 34 Tex. Admin. Code Rules 3.1 and 3.10, it can only be the basis of a detrimental reliance claim for the taxpayer it was issued to, and the Comptroller's office notes the opinion could change if the facts differ.

Citations and references

No statutes or rules are cited in this letter.

Source

• STAR search: https://star.comptroller.texas.gov/search?doc_type_code=L&tax_type_code=SST
• Opinion: https://star.comptroller.texas.gov/view/9303L1223F04

Original ruling text

March 1, 1993

Dear ****:

I am responding to your letter requesting a simple "yes" or "no" answer
to two sales tax questions. As you requested, I tried to keep my answers
as simple as possible.

Question: It is my understanding a contract may be renegotiated to alter
the tax effects, provided it is done before the contract has been
completed. (I do not feel the contract is completed until after the two
year warranty period.) Would the contract still be considered to be in
force during the two year warranty that is included in the specifications
and the contract is so written to include the specifications?

Response: No; the contract is completed once the actual construction
called for in the contract is complete. The warranty period does not extend
the period of time that a contract may be renegotiated for tax purposes.

Question: If we do new construction for a church that is exempt and they
give us an exemption certificate and we write our bid separating labor and
material and they give us verbal notice to proceed without signing a
contract, will this be enough evidence without having a signed contract
to relieve us from paying sales tax on the material.

Response: Yes; in the absence of a formal written contract a written bid,
written invoice, or other such written documentation is considered the
contract.

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

Sincerely,

Tax Administration Division