Indonesia’s Legal System Needs a New Understanding of Law Sources, Study Finds
JAKARTA, Indonesia — A 2026 study by Loso Judijanto of IPOSS Jakarta argues that Indonesia’s legal system can no longer be understood through the traditional distinction between formal and material sources of law alone. Published in the Multitech Journal of Science and Technology (MJST), the research highlights how Indonesia’s national legal framework is increasingly shaped by the interaction of Pancasila, the 1945 Constitution, legislation, court decisions, customary law, Islamic law, and international agreements.
The study is significant because Indonesia faces growing challenges in maintaining legal certainty while accommodating legal pluralism, democratic participation, and rapid social change. As lawmakers continue to reform regulations and courts play a larger role in interpreting laws, understanding how different legal sources interact has become increasingly important for governance, policymaking, and public trust in legal institutions.
Why the Issue Matters
Indonesia is one of the world’s most legally diverse nations. Alongside national legislation, many communities continue to rely on customary legal traditions, while Islamic law plays a formal role in several sectors, including family law and religious courts. At the same time, constitutional rulings, international agreements, and government regulations increasingly influence how laws are interpreted and enforced.
According to the study, this complexity means that legal certainty can no longer be achieved simply by following a hierarchy of written regulations. Instead, policymakers must recognize that multiple legal authorities operate simultaneously within Indonesia’s legal ecosystem.
The issue has become particularly relevant following reforms to Indonesia’s lawmaking process, including amendments to legislation governing the formation of laws and regulations. Debates over public participation, regulatory overlap, and constitutional review have intensified discussions about how legal authority should be defined and exercised.
How the Research Was Conducted
The study employed a Qualitative Literature Review using a narrative review approach.
Rather than collecting survey or experimental data, the research examined:
- Indonesian and international academic journal articles published primarily since 2020.
- Indonesia’s 1945 Constitution.
- Law No. 12 of 2011 on the Formation of Legislation.
- Law No. 13 of 2022 and other relevant legal instruments.
- Scholarly discussions on legal pluralism, jurisprudence, constitutional interpretation, and legal reform.
The sources were analyzed thematically to identify major patterns and emerging debates concerning the sources of law in Indonesia.
Key Findings
The research concludes that Indonesia’s legal sources are best understood as layered, pluralistic, and dynamic, rather than fixed and hierarchical.
Among the most important findings:
Pancasila Functions as a Guiding Meta-Source
The study finds that Pancasila remains the philosophical foundation of Indonesia’s legal system and continues to serve as the “source of all sources of law.”
However, Pancasila does not operate independently. Its legal influence is exercised through constitutional interpretation, legislation, and judicial practice. The research suggests that Pancasila should be viewed as a guiding framework rather than a standalone legal authority.
Legislation Remains Central but Faces New Challenges
Statutory law remains the primary mechanism through which legal norms become enforceable.
Yet the legitimacy of legislation increasingly depends on:
- Transparent lawmaking procedures.
- Meaningful public participation.
- Clear delegation of regulatory authority.
- Effective harmonization between overlapping regulations.
The study notes that procedural quality has become just as important as legal validity itself.
Customary Law Continues to Shape Legal Reality
Indonesia’s recognition of customary law reflects its commitment to legal pluralism.
The research shows that customary law remains influential in many regions and social contexts. However, its legal recognition often depends on administrative procedures and compatibility with national legal principles.
This creates ongoing tensions between local traditions and state legal frameworks.
Islamic Law Plays an Institutionalized Role
The study finds that Islamic law is firmly integrated into several sectors of Indonesia’s legal system, particularly through religious courts and sector-specific legislation.
Nevertheless, Islamic legal practices frequently interact with local customs, producing hybrid legal arrangements that vary across communities.
Court Decisions Are Becoming More Influential
Judicial rulings, particularly from Indonesia’s Constitutional Court, increasingly shape the development of national law.
The research notes that court decisions are no longer viewed merely as interpretations of existing legislation. In many cases, they actively influence legal reform and the practical meaning of constitutional principles.
International Agreements Influence Domestic Law
The study highlights the growing role of international treaties and agreements in shaping Indonesian law.
However, international norms only become legally effective after passing through Indonesia’s constitutional and legislative procedures, ensuring that national sovereignty remains central to the legal process.
Implications for Legal Reform
One of the study’s strongest conclusions is that Indonesia should focus less on creating additional regulations and more on improving coordination among existing legal authorities.
The research recommends:
- Clarifying the hierarchy of delegated regulations.
- Strengthening public participation in lawmaking.
- Improving regulatory transparency and accountability.
- Establishing clearer procedures for recognizing customary law.
- Enhancing access to jurisprudence and court decisions.
- Ensuring that legal reforms are based on evidence, constitutional principles, and human rights standards.
The study argues that future legal certainty should be understood as “orderly pluralism”—a system where multiple legal sources coexist within a transparent and accountable framework.
Academic Perspective
According to Loso Judijanto of IPOSS Jakarta, Indonesia’s legal development should be viewed as an ongoing effort to balance legal certainty, substantive justice, constitutional values, and social realities.
The research emphasizes that customary law, Islamic law, jurisprudence, legislation, and international agreements are not competing legal systems operating in isolation. Instead, they form an interconnected legal ecology that continuously shapes the development and enforcement of national law.
This perspective challenges conventional legal classifications and offers a more comprehensive framework for understanding how law operates in contemporary Indonesia.
Looking Ahead
The study suggests that future research should move beyond conceptual analysis and examine how legal pluralism functions in practice across different regions and sectors.
Potential areas for further investigation include:
- The effectiveness of public participation in legislative processes.
- The practical recognition of customary law communities.
- The influence of Constitutional Court decisions on future legislation.
- The impact of digital governance on legal authority and regulation.
Such research could provide policymakers with more evidence-based tools for improving legal harmonization and governance.
Author Profile
Loso Judijanto is a legal researcher affiliated with IPOSS Jakarta. His work focuses on legal theory, constitutional development, legal pluralism, public policy, and the evolution of Indonesia’s national legal system. His research frequently examines the relationship between Pancasila, legislation, judicial interpretation, and legal reform in contemporary Indonesia.
Source
Article Title: Reconceptualization of Sources of Law in Indonesia: Pancasila, Legal Pluralism, and Harmonization of National Law Formation
Author: Loso Judijanto
Affiliation: IPOSS Jakarta
Journal: Multitech Journal of Science and Technology (MJST)
Year: 2026
Volume and Issue: Vol. 3, No. 5, pp. 545–564
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