Demand Letters (Somasi) in Indonesia: When and How to Send One

A somasi is a formal written warning sent to a party who has failed to fulfill a legal or contractual obligation, demanding that the obligation be performed within a specified period. It is a common first step in Indonesian civil practice before pursuing litigation, and in many cases serves an important evidentiary function: under Indonesian civil law, a party is generally not considered formally in default (wanprestasi) until it has been given proper notice of that default, unless the relevant agreement specifies otherwise.

When a somasi is typically used

• A debtor has failed to repay a loan or outstanding invoice by the agreed date
• A counterparty has failed to deliver goods, services, or perform obligations under a contract
• A tenant or property occupant has breached the terms of a lease or occupancy agreement
• A party has caused loss or damage and has not voluntarily provided compensation

What a properly prepared somasi generally contains

• Identification of the parties — the sender and the recipient, with complete and accurate details
• Description of the underlying obligation — the agreement, transaction, or legal basis giving rise to the obligation
• Description of the default — a clear statement of how and when the obligation was not fulfilled
• The specific demand — what the recipient is being asked to do, such as payment of a specific amount or performance of a specific act
• A deadline for compliance — a clear, reasonable time period within which the recipient must respond or act
• Consequences of non-compliance — a statement that legal proceedings may follow if the demand is not met within the given period

How many letters are needed?

It is common in Indonesian practice to see demand letters sent in a series — often referred to informally as somasi pertama, kedua, and ketiga (first, second, and third) — though this is a matter of practice and strategy rather than a strict legal requirement in every case. What matters most is that the recipient has been given clear, documented notice and a fair opportunity to respond before further legal action is taken.

Why a demand letter should not be treated as a formality

A poorly drafted somasi — one that is vague about the obligation, unclear about the deadline, or inconsistent with the underlying agreement — can weaken a party's position if the matter later proceeds to litigation. Because the letter may later be presented as evidence of proper notice, it is generally worth having it reviewed or prepared by legal counsel rather than treating it as routine correspondence.