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How to File a Criminal Complaint – Complete Step-by-Step Guide (2026)

Adv. Kuldeep Kumar July 23, 2026 5 min read

What is a Criminal Complaint?

A criminal complaint is a formal allegation made before the police or a competent court stating that a criminal offence has been committed. Depending on the nature of the offence, a complaint may result in the registration of an FIR, a police investigation, or court proceedings.

Under the Bharatiya Nagarik Suraksha Sanhita (BNSS), 2023, a person may report a criminal offence through the appropriate legal process.

When Should You File a Criminal Complaint?

You should consider filing a criminal complaint if:

  • You are a victim of a criminal offence.

  • You have witnessed the commission of a crime.

  • Someone has caused you physical, financial, or mental harm through a criminal act.

  • You have reliable information about a cognizable offence.

  • Your legal rights have been violated through conduct that amounts to a criminal offence.

Step-by-Step Process to File a Criminal Complaint

Step 1: Collect Relevant Information

Before filing the complaint, gather all available information, including:

  • Date and time of the incident.

  • Place of occurrence.

  • Details of the accused (if known).

  • Description of the incident.

  • Names of witnesses (if any).

  • Supporting documents, photographs, videos, or other evidence.

Step 2: Visit the Appropriate Police Station

Report the matter to the police station having jurisdiction over the place where the offence occurred.

If immediate action is required in a cognizable offence and jurisdiction is uncertain, you may request registration of a Zero FIR, which can later be transferred to the appropriate police station.

Step 3: Submit the Complaint

Provide the police with complete and accurate information regarding the incident.

The complaint should clearly mention:

  • What happened.

  • When it happened.

  • Where it happened.

  • Who was involved.

  • Available evidence.

Read the complaint carefully before signing it.

Step 4: Registration of FIR (Where Applicable)

If the information discloses a cognizable offence, the police may register an FIR and begin an investigation in accordance with the law.

If the matter relates to a non-cognizable offence, the police may follow the procedure prescribed under the BNSS, which may include referring the complainant to the competent Magistrate where required.

Step 5: Obtain an Acknowledgment

Request:

  • A free copy of the FIR, if one is registered.

  • An acknowledgment or diary/reference number where applicable.

Keep these documents safely for future reference.

Step 6: Cooperate During the Investigation

After filing the complaint:

  • Respond to lawful requests from the investigating officer.

  • Provide additional evidence if available.

  • Attend when required for statements or identification procedures.

What If the Police Refuse to Register the Complaint?

If the police do not act according to the applicable legal procedure, you may consider:

  • Approaching a senior police officer.

  • Filing an appropriate application before the competent Magistrate, where permitted by law.

  • Seeking legal advice from a qualified criminal lawyer.

The available remedies depend on the facts of the case and the applicable legal provisions.

Documents You May Need

Depending on the case, you may require:

  • Identity Proof

  • Address Proof

  • Photographs or Videos

  • Medical Reports (if applicable)

  • Property Documents (if relevant)

  • Bills or Receipts

  • Electronic Records

  • Any other supporting evidence

The required documents vary according to the nature of the offence.

Difference Between a Criminal Complaint and an FIR

Feature Criminal Complaint FIR
Purpose Reports a criminal offence to the police or court Officially records information about a cognizable offence
Applicable Offences May relate to cognizable or non-cognizable offences Generally relates to cognizable offences
Filed Before Police or competent court Police
Investigation Depends on the nature of the complaint and applicable law Police investigation generally begins after registration

Disclaimer: This article is for general informational purposes only and does not constitute legal advice. Please consult a qualified advocate for your specific legal matter.
Adv. Kuldeep Kumar
Verified Advocate
Bar Council Reg: BR/196/2015

Frequently Asked Questions

A criminal complaint is a formal report made to the police or a competent court alleging that a criminal offence has been committed.

A victim, a witness, or any person having relevant information about a criminal offence may file a complaint, depending on the applicable law.

No. A criminal complaint is a broader term. An FIR is generally registered by the police when information discloses a cognizable offence.

You may carry identity proof, supporting documents, photographs, videos, medical records, electronic evidence, or any other material relevant to the incident.

Some State Police Departments provide online complaint or e-FIR facilities for certain categories of offences. Availability depends on the State and the type of offence.

Depending on the circumstances, you may approach a senior police officer, seek appropriate relief before the competent Magistrate, or consult a qualified lawyer.

Yes. A complaint may still be filed even if the identity of the accused is unknown, provided the available facts are reported accurately.

If an FIR is registered, the informant is generally entitled to receive a free copy.

Whether a complaint can be withdrawn depends on the nature of the offence and the applicable legal provisions. Certain offences may be compoundable, while others may not.

Although not mandatory in every case, consulting a qualified criminal lawyer can help you understand your legal rights, prepare the complaint properly, and guide you through the legal process.
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