G.R. No. 167082 - Buenaventura vs. Metropolitan Bank and Trust Co.

Silkair (Singapore) Pte. Ltd. is a foreign corporation organized under the laws of Singapore with a Philippine representative office in Cebu City.
The petitioner is an on-line international carrier operating routes connecting Singapore, Cebu, and Davao.
The respondent is the Commissioner of Internal Revenue, responsible for the administration of tax laws including refunds of erroneously paid taxes.

Between January 1, 1999, and December 31, 1999, petitioner purchased aviation jet fuel from Petron Corporation for its international flights.
Aviation Delivery Receipts and Invoices reflected an excise (specific) tax of P3.67 per liter added to the purchase price.
For the first half of 1999 (January 1 to June 30), petitioner (through its sister company Singapore Airlines Ltd.) remitted P4,239,374.81 as excise taxes.
For the second half of 1999 (July 1 to December 31), petitioner paid an amount of P4,831,224.70 as excise taxes.

Petitioner filed formal claims for a refund or the issuance of a tax credit certificate for the excise taxes allegedly erroneously paid.
The claim is based on the petitioner’s position that it is exempt from excise tax under Section 135 of the 1997 National Internal Revenue Code (NIRC) and Article 4 of the Air Transport Agreement between the Philippines and Singapore.
Petitioner argued that it is the intended beneficiary of the tax exemption and that Petron merely remitted the taxes to the Bureau of Internal Revenue (BIR) on its behalf.
Petitioner contended that if refund claims are limited to Petron—the seller—then its own personal tax exemption privilege becomes ineffective.

Section 135 of the NIRC exempts international carriers and certain exempt entities from excise taxes, provided specific conditions (such as storage in bonded tanks) are met.
Article 4 of the Air Transport Agreement exempts designated airlines from duties and taxes on fuel and related supplies, subject to customs supervision.
The Supply Contract between petitioner and Petron requires the submission of a valid exemption certificate by the buyer to ensure that tax is not improperly passed on.

Petitioner asserted that, in reality, the excise taxes were paid by it (or transacted through its affiliated companies), and that requiring Petron to make the refund would unfairly deprive petitioner of its exemption and property rights.
Petitioner maintained that the tax exemption is a personal privilege and that its benefits should include the right to recover any tax paid erroneously.
The respondent, however, argued that under the nature of indirect taxation, even if the tax burden is shifted to the purchaser, the legal incidence of the tax remains with the manufacturer or seller (Petron).
Citing precedents such as Philippine Acetylene Co., Inc. v. Commissioner of Internal Revenue, the respondent emphasized that only the statutory taxpayer—the entity originally liable for the tax—can claim a refund.

Whether petitioner, as the purchaser and beneficiary of a purported tax exemption, is the proper party entitled to claim a refund of the excise taxes paid on aviation jet fuel.
Whether the shifting of the excise tax burden from Petron to petitioner transforms petitioner into the statutory taxpayer eligible to file for a refund.
Whether the exemptions provided under Section 135 of the NIRC and the Air Transport Agreement should grant petitioner not only an exemption from concurrent tax liability but also the right to claim a refund for taxes already remitted by Petron.