How does the 18-month window for using a replaced vehicle toward a fair market value deduction get calculated, and what date counts as the start of that clock?

Plain-English summary

A taxpayer wrote to the Comptroller's office asking about the fair market value deduction — a method that lets motor vehicle dealers, lessors, and certain rental companies reduce their motor vehicle sales tax liability on the purchase price of a new vehicle without doing a physical trade-in. A replaced vehicle can be used toward this deduction for up to 18 months from the date it is retired from service and offered for sale.

The letter answers two specific questions. First, what counts as a "new vehicle" for this purpose — the answer is simply a vehicle that is newly acquired, whether it's actually new or used. Second, the taxpayer noted that the primary date in their computer records was the used vehicle's sale date, and asked whether that sale date could be used as the "retired from service" date that starts the 18-month clock. The Comptroller said no: the 18-month period begins when the vehicle is retired from service, so the later sale date cannot be substituted for that purpose.

What this means for you

Motor vehicle dealers, lessors, and rental companies

If you're tracking eligibility for the fair market value deduction, make sure your records capture the actual date a vehicle was retired from service — not just its eventual sale date. Using the sale date instead could make a vehicle look eligible (or ineligible) for the deduction when it isn't, based on the true 18-month window.

Accountants and tax professionals

This letter clarifies two narrow definitional points that matter for calculating the fair market value deduction: (1) "new vehicle" just means newly acquired (new or used), and (2) the 18-month eligibility clock runs from the retired-from-service date, not the sale date. If a client's recordkeeping system only stores a sale date, it may need a separate field for the retired-from-service date to support this calculation correctly.

Business owners replacing fleet or personal-use vehicles

If your business is retiring vehicles from service and later reselling them, keep clear records of exactly when each vehicle stopped being used, since that date — not the date you eventually sell it — determines how long you have to apply it toward a fair market value deduction on a new purchase.

Common questions

Q: What does "new vehicle" mean for purposes of the fair market value deduction?
A: It means a vehicle that is newly acquired. It can be either a new or a used vehicle.

Q: How long can a replaced vehicle be used for a fair market value deduction?
A: Up to 18 months from the date it is retired from service and offered for sale.

Q: Can I use the vehicle's sale date instead of its retired-from-service date to measure the 18-month period?
A: No. The 18-month clock begins when the vehicle is retired from service, and the sale date cannot be used in determining length of eligibility.

Q: Does the fair market value deduction require an actual physical trade-in?
A: No. It's a method for reducing motor vehicle sales tax liability on a new vehicle's purchase price without using a physical trade-in.

Q: Can I rely on this letter for my own situation?
A: This opinion is based on the facts presented to the Comptroller's office; if there are additional or different facts, the opinion could change.

Citations and references

No specific statutes or rule numbers were 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/9606L1424A06

Original ruling text

June 18, 1996

Dear **:

I have received your letter regarding the fair market value deduction.

Facts: The fair market value deduction is a method by which motor vehicle
dealers, lessors and certain rental companies may reduce their motor vehicle
sales tax liability on the purchase price of a new vehicle without using a
physical trade-in. A replaced vehicle may be used as a fair market value
deduction up to eighteen (18) months from the date it is retired from service
and offered for sale.

Question 1: You ask for the definition of a new vehicle.

Response: A new vehicle means that it is newly acquired. It can be either
a new or used vehicle.

Question 2: You state that the primary date you have on the computer is the
sale date of the used vehicle. You ask if you can use the sale date as the
retired from service date.

Response: The 18-month clock begins when the vehicle is retired from
service. Therefore, the sale date cannot be used in determining length of
eligibility for fair market value deduction.

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

If you have any questions, please don't hesitate to call one of our tax
specialists toll free at 1-800-252-5555. The direct number is 512/463-4600.
You may also write to Tax Policy Division, Comptroller of Public Accounts.

Sincerely,

Joan Hale
Tax Policy Division