FET and the Six-Month Rule on Parts and Accessories

By Rose-Michele Nardi
Transport Counsel PC

This article was published in the November 2014 edition of NTEA News

Question: A customer recently purchased a new truck chassis, and the invoice for the truck included Federal Excise Tax (FET). He now wants our company to install an additional part on the truck chassis. (The part would have been taxable if it was included on the truck when the truck was sold.) Since the customer already paid tax on the truck, is there any tax risk for our company under Internal Revenue Code (IRC) Section 4051?  

Answer: Yes, there could be a tax risk for your company. You will need to apply the so-called “Six-Month Rule” to determine if your installation of the additional part would trigger Section 4051 tax (FET). If it does, then you would have “secondary liability” for the FET. 

In order to determine whether or not your installation is taxable under the Six-Month Rule, consider the following questions:   

  1. Is the new taxable part being installed within six months after the date the owner took actual possession of the vehicle?
  2. If no, then no FET will be triggered under the Six-Month Rule.
  3. If yes, then FET may be triggered under the Six-Month Rule. Go to Question 2.
  4. Is the part a replacement part?
  5. If no, then FET may be triggered under the Six-Month Rule. Go to Question 3.
  6. If yes, then no FET will be triggered under the Six-Month Rule.
  7. Is the price of all parts or accessories installed during the six-month period after the owner took actual possession of the vehicle more than $1,000?
  8. If no, then no FET is triggered under the Six-Month Rule.
  9. If yes, then FET will generally be triggered under the Six-Month Rule.  

If the price of the part you are installing is more than $1,000, then the third question is easy to answer. If the price of the part is less than $1,000, the answer is more difficult since installations under $1,000 may still trigger FET if the owner previously had a different installer install taxable parts or accessories within the applicable six-month period.   

Consider this example: An owner takes actual possession of a vehicle in November, has Company A install a taxable part priced at $800 in December and then has Company B install a $300 taxable part in January. In this situation, the installation by Company B could trigger FET under the Six-Month Rule since the total price of all the parts installed on the vehicle within the applicable six-month period was more than $1,000. In addition, it appears the Internal Revenue Service (IRS) might apply the $1,000 threshold to all the parts and accessories installed on both the chassis and the body of the vehicle (as long as the installations occur within the applicable six-month period for each of those articles), rather than applying the dollar threshold separately to chassis parts and body parts.        

If triggered by your installation, FET would be calculated based on the price of the accessory (including the cost of installation). Although the owner would be primarily liable for the FET, you, as installer, would have “secondary liability”. The IRS has done little to clarify this term, but secondary liability suggests that if the owner does not pay the FET, the IRS can assess the tax against the installer.   

For more information about the Six-Month Rule, see IRC Section 4051(b); Temporary Treasury Regulation 145.4051-1(c). (Note: the Treasury Regulations provide that FET may be triggered under the Six-Month Rule if the aggregate price of parts or accessories exceeds only $200; in 1997, Congress increased this amount from $200 to $1,000 in the statute, but the Treasury Regulations were not similarly updated. However, the IRS has applied the $1,000 threshold in at least two private letter rulings since 1997.)  

In addition, whenever you modify a used vehicle, you should also keep in mind the further manufacturing rules. If your modifications “further manufacture” a vehicle, FET will typically be triggered, even when the modifications are made after the owner has possessed the vehicle for six months. However, as long as the chassis was taxable when new, “further manufacturing” will generally occur only if the cost of such modifications is more than 75% of the retail price of a new chassis comparable to the now-modified chassis. This means most modifications to a previously taxable chassis will not trigger FET. See IRC Section 4052(f).