19 C.F.R. § 10.2016
(a) Calculating the value of materials. For purposes of calculating the regional value content of a good under General Note 35, HTSUS, and for purposes of applying the de minimis (see § 10.2018) provisions of General Note 35, HTSUS, the value of a material is:
(3) In the case of a self-produced material, the sum of:
(b) Examples. The following examples illustrate application of the principles set forth in paragraph (a)(2) of this section:
Example 1.A producer in Panama purchases material x from an unrelated seller in Panama for $100. Under the provisions of Article 1 of the Customs Valuation Agreement, transaction value is the price actually paid or payable for the goods when sold for export to the country of importation adjusted in accordance with the provisions of Article 8. In order to apply Article 1 to this domestic purchase by the producer, such purchase is treated as if it were a sale for export to the country of importation. Therefore, for purposes of determining the adjusted value of material x, Article 1 transaction value is the price actually paid or payable for the goods when sold to the producer in Panama ($100), adjusted in accordance with the provisions of Article 8. In this example, it is irrelevant whether material x was initially imported into Panama by the seller (or by anyone else). So long as the producer acquired material x in Panama, it is intended that the value of material x will be determined on the basis of the price actually paid or payable by the producer adjusted in accordance with the provisions of Article 8.
Example 2.Same facts as in Example 1, except that the sale between the seller and the producer is subject to certain restrictions that preclude the application of Article 1. Under Article 2 of the Customs Valuation Agreement, the value is the transaction value of identical goods sold for export to the same country of importation and exported at or about the same time as the goods being valued. In order to permit the application of Article 2 to the domestic acquisition by the producer, it should be modified so that the value is the transaction value of identical goods sold within Panama at or about the same time the goods were sold to the producer in Panama. Thus, if the seller of material x also sold an identical material to another buyer in Panama without restrictions, that other sale would be used to determine the adjusted value of material x.
(c) Permissible additions to, and deductions from, the value of materials—(1) Additions to originating materials. For originating materials, the following expenses, if not included under paragraph (a) of this section, may be added to the value of the originating material:
(2) Deductions from non-originating materials. For non-originating materials, if included under paragraph (a) of this section, the following expenses may be deducted from the value of the non-originating material: