G.R. No. L-24754 July 18, 1975
THE COMMISSIONER OF INTERNAL REVENUE, petitioner-appellant, vs. P. J. KIENER COMPANY, LTD., INTERNATIONAL CONSTRUCTION CORPORATION, GAVINO T. UNCHUAN AND THE COURT OF TAX APPEALS, respondent-appellees.

FACTS

Respondent companies formed a joint venture and entered into a contract with the Republic of the Philippines for the construction of the Mactan Airfield, a project financed by the United States government under the Military Bases Agreement. The contract incorporated General Conditions, which included Section 3-19 stating that, in accordance with the Mutual Defense Agreement, no tax would be levied on any material, equipment, or supplies purchased solely for the project. During construction, the respondents purchased petroleum products from Caltex (Phil.) Inc. to operate their machinery. Caltex paid specific taxes on these products and passed the cost to the respondents, who subsequently sought a tax credit/refund for these amounts, arguing the petroleum was tax-exempt under the contract and the international agreements.
The Commissioner of Internal Revenue denied the claim, contending that petroleum used to fuel contractors’ equipment were not “materials” or “supplies” used solely for the project but were instead consumed in the operation of the contractor’s own plant. The Court of Tax Appeals partially granted the respondents’ petition, ordering a tax credit for a portion of the claimed amount after disallowing some items due to prescription and non-project use. The Commissioner appealed this decision to the Supreme Court.

ISSUE

Whether the petroleum products (gasoline, diesel, lubricants) purchased by the contractor-respondents and used to operate their construction equipment for the Mactan Airfield project are exempt from specific tax as “materials” or “supplies” under the tax exemption clause of the construction contract and the pertinent Military Bases Agreement and Aide Memoire.

RULING

The Supreme Court ruled in favor of the respondents and affirmed the decision of the Court of Tax Appeals. The petroleum products are exempt from specific tax. The legal logic is anchored on the interpretation of the tax exemption clause within the context of the governing international agreements and the construction contract. The Court rejected the Commissioner’s restrictive interpretation that “materials” refer only to items that become integral parts of the finished structure. Instead, it adopted a functional and broad interpretation, consistent with the purpose of the Mutual Defense Agreement and Aide Memoire, which aimed to avoid imposing Philippine taxes on projects ultimately financed by the United States.
The Court held that the petroleum products were essential “supplies” directly and solely consumed in the construction process. They were indispensable for operating the equipment that executed the project, making them as necessary as other construction materials. The exemption clause covered all items required solely for the project, and fuel for the contractor’s machinery clearly fell within this category. The Court emphasized that the exemption was a contractual obligation of the Philippine government derived from an international treaty, which should be construed liberally to fulfill its objective. Therefore, the specific taxes paid on these petroleum products, having been effectively shouldered by the respondents, were correctly credited.