The Letter of Collection (incassobrief) is a essential document in Dutch debt collection procedures, typically used when previous informal payment requests have been unsuccessful. It represents a formal step in the debt collection process, marking the transition from friendly payment reminder to formal collection procedure. The document must strictly comply with Dutch regulations, particularly the Wet Incassokosten (WIK), which specifies requirements for collection costs and procedures. It is used across various industries and can be issued either directly by creditors or through authorized collection agencies. The letter must include specific information such as the original debt amount, statutory interest, collection costs, payment deadline, and potential legal consequences of non-payment. This document serves both as a formal payment demand and as potential evidence in any subsequent legal proceedings.

1. Sender Details: Full legal name, address, and contact information of the collecting entity

2. Recipient Details: Full name and address of the debtor

3. Date and Reference: Current date and unique reference number for the debt collection case

4. Subject Line: Clear indication that this is a collection notice (e.g., 'Final Payment Notice - Invoice [Number]')

5. Original Debt Details: Information about the original invoice or debt, including date, amount, and service/product description

6. Current Amount Due: Clear breakdown of the total amount due, including original amount, interest, and any collection costs as per WIK regulations

7. Payment Instructions: Detailed payment information including bank account details, reference number, and deadline

8. Legal Basis: Reference to the legal grounds for the collection and applicable regulations

9. Response Deadline: Clear statement of the deadline for response or payment (typically 14 days as per Dutch practice)