Tax Assumption vs. Tax Exemption: The Mitsubishi Ruling on Government-Promised Tax Relief

The Supreme Court's 2017 ruling in Mitsubishi Corporation-Manila Branch v. Commissioner of Internal Revenue settled a recurring question for foreign contractors in Philippine government projects: when the government promises to "assume" a contractor's taxes, does that promise hold up in court? The answer is yes—provided the promise is a genuine tax assumption, not a tax exemption, and the claim is filed correctly.

The Dispute: Who Pays the Taxes on the Calaca II Project?

Mitsubishi Corporation-Manila Branch paid income tax and branch profit remittance tax (BPRT) for fiscal year ending March 31, 1998, on income from the Calaca II Coal-Fired Thermal Power Plant Project. It then sought a refund from the Commissioner of Internal Revenue (CIR), arguing the payments were erroneous because the Philippine government had agreed to assume these taxes.

The dispute traced back to a 1987 Exchange of Notes between Japan and the Philippines, under which Japan extended a ¥40.4 billion loan through the Overseas Economic Cooperation Fund (OECF) for the Calaca II project. The Exchange of Notes provided that the Philippine government would assume all fiscal levies or taxes imposed on Japanese firms and nationals supplying products and services under the loan. (The exact wording of Paragraph 5(2) is not reproduced here, but its substance is as described.)

The National Power Corporation (NPC), as executing agency, contracted Mitsubishi for the project. The contract reinforced the arrangement: NPC would pay any and all forms of taxes directly imposable under the contract, including VAT. (The specific article number is not cited here, but the provision's effect is as described.)

The Courts Disagree: CTA Division vs. CTA En Banc

The Court of Tax Appeals (CTA) Division granted Mitsubishi's refund, holding that the Exchange of Notes obligated the government to assume the tax burden. But the CTA En Banc reversed, reasoning that Mitsubishi failed to prove its payments were erroneous, and that the Exchange of Notes lacked Senate concurrence—which, in its view, made it an invalid tax exemption.

The Supreme Court: Tax Assumption Is Not Tax Exemption

The Supreme Court reversed the CTA En Banc and restored the refund. In doing so, it drew a critical legal distinction:

• Tax exemption eliminates the tax itself—the taxpayer owes nothing.
• Tax assumption keeps the tax but shifts the responsibility to pay it to another party.

The Exchange of Notes was a tax assumption, not a tax exemption. Mitsubishi's obligation to pay the tax remained; it was simply the Philippine government's duty to shoulder the cost. This distinction mattered because tax exemptions generally require legislative approval, while executive agreements can validly authorize tax assumptions.

Why the Lack of Senate Concurrence Did Not Invalidate the Agreement

The Supreme Court rejected the CTA En Banc's reliance on the absence of Senate concurrence. An exchange of notes is a form of executive agreement, binding on the state through executive action alone—no Senate vote required. The Court cited Abaya v. Ebdane for this principle. Since the Exchange of Notes created a tax assumption rather than a tax exemption, the lack of Senate concurrence was irrelevant.

Administrative Issuances Cannot Override the Law

The Court also addressed a revenue memorandum circular that directed Japanese contractors to seek refunds from NPC rather than the CIR. (The specific circular number is not available in the ASG law library and is therefore not cited here.) The Supreme Court held that this administrative issuance could not override the CIR's statutory authority under Sections 204 and 229 of the National Internal Revenue Code (NIRC) to refund erroneously collected taxes. Citing ING Bank N.V. v. CIR, the Court reminded that administrative rulings interpreting tax laws are not conclusive and will be disregarded if judicially found incorrect. (The specific G.R. numbers for these cases are not reproduced here, but the rulings are as described.)

Who Ultimately Pays?

The Supreme Court held that Mitsubishi correctly filed its refund claim with the BIR under Sections 204 and 229 of the NIRC. While the BIR was obligated to refund Mitsubishi, it could then seek reimbursement from NPC—the party that assumed the tax liability under the Exchange of Notes.

Practical Takeaways

• Know the difference: A government promise to "assume" taxes is not the same as a tax exemption. Assumption shifts payment responsibility; exemption extinguishes the tax.
• Executive agreements are binding: Exchange of notes and similar executive agreements can validly impose tax assumptions on the government without Senate concurrence.
• File refunds correctly: Claims for erroneous tax payments must follow the statutory process under Sections 204 and 229 of the NIRC.
• Administrative rules yield to law: Revenue memorandum circulars cannot override statutory refund authority.
• Check the contract: Foreign contractors in government projects should verify whether tax assumption clauses exist in both the international agreement and their project contract.

This article is general information and not legal advice. For your specific situation, consult a lawyer or ask ASG Legal AI.