Last materially reviewed: September 3, 2026
Direct Answer
Before filing a data privacy complaint with the National Privacy Commission, prepare the facts, evidence, prior correspondence and required complaint form carefully. A complete filing is easier to evaluate and reduces avoidable delays.
Complaint Checklist
- Identify the person or organization responsible for the alleged violation.
- Write a dated timeline of what happened.
- Preserve screenshots, emails, messages, notices and transaction records.
- Keep copies of any privacy request or complaint you first sent to the organization.
- Document the response, refusal or lack of response.
- Identify the personal data involved.
- Explain the harm, risk or privacy right affected.
- Prepare witness affidavits if relevant.
- Complete the NPC Complaints-Assisted Form or verified complaint.
- Have the filing notarized where required.
- Attach supporting documents in a clear, indexed set.
- Retain a complete copy of everything submitted.
Evidence to Prioritize
The most useful evidence usually proves what data was involved, who processed or disclosed it, when the incident occurred, what requests you made and what response you received. See What Evidence Do You Need for a Data Privacy Complaint?.
How to File
The NPC accepts formal complaints under its Rules of Procedure. The Commission’s current guidance provides a Complaints-Assisted Form and explains submission methods and documentary requirements.