The Doctrine of Transformation vs Incorporation

GR 231062; (November, 2020) (Digest)

March 17, 2026

GR 235832; (November, 2020) (Digest)

March 17, 2026

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SUBJECT: The Doctrine of Transformation vs Incorporation

I. Introduction and Issue Presented
This memorandum addresses the doctrinal conflict between Transformation and Incorporation in Philippine law concerning the domestic application of customary international law and treaties. The core issue is determining which doctrine governs how international law norms become part of the law of the land, absent explicit constitutional provision, and the practical implications for legal advocacy and judicial reasoning.
II. Brief Answer
The prevailing and dominant doctrine applied by the Supreme Court is the Doctrine of Incorporation, as articulated in Section 2, Article II of the 1987 Constitution. Under this doctrine, the Philippines adopts the generally accepted principles of international law as part of its domestic law automatically, without the need for legislative enactment. However, a nuanced, quasi-transformation requirement exists for treaties, which generally require Senate concurrence to become effective as domestic law.
III. Statement of Relevant Facts
The inquiry is precipitated by the absence of a singular constitutional text mandating one doctrine over the other. The legal landscape involves: (1) the text of the 1987 Constitution; (2) conflicting obiter dicta in early Supreme Court decisions; and (3) a consistent line of modern jurisprudence applying international law in domestic proceedings, ranging from human rights to the law of the sea.
IV. The Constitutional Framework: Article II, Section 2
The cornerstone is the 1987 Constitution, Article II, Section 2, which states: “The Philippines renounces war as an instrument of national policy, adopts the generally accepted principles of international law as part of the law of the land and adheres to the policy of peace, equality, justice, freedom, cooperation, and amity with all nations.” This clause is the primary basis for the Incorporation Doctrine, explicitly making customary international law (“generally accepted principles”) part of domestic law.
V. The Doctrine of Incorporation Explained
Under pure incorporation, the Philippines is considered part of the community of nations, and international law is seamlessly integrated into the municipal legal system. Customary international law, once identified as “generally accepted,” is automatically applicable by Philippine courts. This does not require an act of Congress. The doctrine presumes a harmony between international and domestic law.
VI. The Doctrine of Transformation and Its Limited Application
The Doctrine of Transformation posits that international law is not applicable domestically unless it has been transformed into municipal law through a positive legislative act. While not the dominant rule, elements of transformation are present in the Philippine system regarding treaties. Under Section 21, Article VII of the Constitution, no treaty or international agreement is valid and effective without the concurrence of at least two-thirds of the Senate. This concurrence acts as the transformative act for treaties to have domestic force, distinguishing treaty application from customary law incorporation.
VII. Analysis of Supreme Court Jurisprudence
The Supreme Court has resolved the apparent conflict firmly in favor of incorporation for customary law, while applying a transformation-like process for treaties.
For Customary International Law: In Mejoff v. Director of Prisons (G.R. No. L-2855, 1951) and decisively in Republic v. Sandiganbayan (Estate of Ferdinand Marcos) (G.R. No. 152154, 2003), the Court held that the incorporation clause is “more than [just] a declaration.” It is an operative act making international law part of Philippine law. The Court routinely applies rules of customary international law (e.g., on diplomatic immunity, the law of the sea) directly.
For Treaties: In Tanada v. Angara (G.R. No. 118295, 1997), the Court affirmed that treaty-making involves presidential negotiation and Senate concurrence, the latter being the “legislative act” that gives the treaty domestic effect. However, once concurred in, the treaty is incorporated into law.
Synthesis: The Philippine approach is thus a hybrid. Customary international law is incorporated automatically. Treaties are incorporated upon compliance with the constitutional condition precedent of Senate concurrence, a quasi-transformative step.
VIII. Implications of the Doctrinal Stance

Judicial Notice: Courts can take judicial notice of and directly apply “generally accepted principles of international law.”

Statutory Construction: An intention to violate international law is not presumed. Municipal laws are interpreted, whenever possible, in harmony with the Philippines’ international obligations.

Hierarchy of Norms: Both incorporated customary law and ratified treaties are inferior to the Constitution. In a conflict, the Constitution prevails (Ichong v. Hernandez, 1957). However, they generally share the same stature as statutes, with the later-in-time rule applying to conflicts between a treaty and a statute.

IX. Practical Remedies

Pleading International Law: In litigation, affirmatively plead relevant principles of customary international law or provisions of ratified treaties as directly applicable rules of decision, citing Article II, Section 2. Do not assume they require a domestic statute for effect.

Advocacy Before Courts: In briefs, use international law as a persuasive tool for statutory construction and to fill gaps in domestic law. Argue for the “generally accepted” status of a customary norm through evidence of state practice and opinio juris.

Challenging State Action: Use a violation of a binding international law obligation (customary or treaty-based) as a ground for challenging administrative or executive action, arguing such action is devoid of legal basis for being contrary to the “law of the land.”

Legislative Strategy: For treaties, secure Senate concurrence. For customary norms not yet recognized, build a record before courts and executive agencies demonstrating their “generally accepted” status to trigger incorporation.

Defense in Criminal/Civil Cases: In appropriate cases (e.g., involving acts of state, diplomatic agents, or maritime incidents), invoke applicable rules of international law as a defense, which the court is obligated to consider as part of domestic law.

Remedy for Violation: A violation of an incorporated international law norm provides a cause of action or a defense just as any other domestic legal violation would. Primary remedies are judicial: injunction, declaratory relief, or damages. In extreme cases, a violation may give rise to diplomatic protection by the state at the international level.