Supplemental Agreement Template for Indonesia

What is a Supplemental Agreement?

A Supplemental Agreement is essential when parties need to modify an existing contractual arrangement without completely restating or replacing the original agreement. Under Indonesian law, this document type is commonly used when business relationships evolve, requiring amendments to commercial terms, scope, duration, or other key provisions. The Supplemental Agreement must be drafted in compliance with Indonesian legal requirements, including language requirements under Law No. 24 of 2009 and corporate authority requirements under Law No. 40 of 2007. It typically includes specific references to the original agreement, clearly articulated modifications, and confirmatory language about unchanged provisions. This document type is particularly important in Indonesia's dynamic business environment where regulatory changes and evolving business relationships often necessitate contract modifications.

About the Supplemental Agreement

When you need to modify an existing contract in Indonesia, a Supplemental Agreement provides the legally compliant framework to implement changes without invalidating your original agreement. Under Indonesian Civil Code (KUHPerdata) Book III on Obligations, this document allows you to amend specific terms while preserving the foundational contract structure and unchanged provisions.

When do you need this document?

You'll require a Supplemental Agreement when your business circumstances change after executing an original contract. Common situations include adjusting payment schedules due to economic conditions, extending project timelines, modifying scope of work, changing key personnel responsibilities, or adapting to new Indonesian regulatory requirements. Indonesian Limited Liability Companies (PT) frequently use these agreements when joint venture terms need adjustment, foreign companies require modifications to comply with updated investment regulations, or state-owned enterprises (BUMN) need to align existing contracts with new government policies. Financial institutions also rely on supplemental agreements when modifying loan terms or collateral arrangements.

Key legal considerations

Your Supplemental Agreement must clearly identify which provisions of the original contract are being modified, replaced, or supplemented. Under Indonesian contract law, all parties must possess legal authority to execute modifications, particularly for PT companies where board resolutions may be required under Law No. 40 of 2007. The agreement should explicitly state that all other terms of the original contract remain in full force and effect. You must ensure the modifications don't violate Indonesian competition law under Government Regulation No. 57 of 2010, especially when altering pricing or market allocation terms. Consider including updated dispute resolution mechanisms referencing Law No. 30 of 1999 on Arbitration and Alternative Dispute Resolution, particularly if the original agreement's dispute resolution provisions are inadequate for the modified relationship.

Legal requirements in Indonesia

Indonesian law mandates specific compliance requirements for your Supplemental Agreement. Under Law No. 24 of 2009, contracts involving Indonesian parties must be drafted in Bahasa Indonesia or be bilingual if foreign entities are involved. Corporate parties must demonstrate proper authorization through valid board resolutions or power of attorney documents. The agreement must contain sufficient detail to identify the original contract being modified, including execution date, parties, and subject matter. For certain industries like banking or telecommunications, additional regulatory approvals may be required before the supplemental agreement becomes effective. Ensure proper execution formalities are followed, including notarization if required by the original agreement or applicable regulations. The document should also specify the governing law and jurisdiction for any disputes arising from the modifications.