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BNS Section 47 Explained: Act Done by a Person Justified, or by Mistake of Fact Believing Himself Justified by Law

Adv. Kuldeep Kumar June 22, 2026 5 min read

Section Overview

Section Number: 47

Section Title: Act Done by a Person Justified, or by Mistake of Fact Believing Himself Justified by Law

Act: Bharatiya Nyaya Sanhita, 2023 (BNS)

Status: Active

Applicability: Applicable throughout India.

BNS Section 47 is one of the General Exceptions under the Bharatiya Nyaya Sanhita, 2023. It recognizes that individuals may sometimes perform acts believing them to be legally justified due to a genuine mistake of fact.

The law distinguishes between:

  • Mistake of Fact

  • Mistake of Law

Protection is generally available for a bona fide mistake of fact but not for ignorance of law. This distinction is a fundamental principle of criminal jurisprudence.

Section Explanation

Simple Explanation (Plain English / Hinglish)

Agar koi vyakti kisi fact ko galat samajhkar honestly believe karta hai ki uska act kanoon ke hisab se justified hai, to usse criminal liability se protection mil sakti hai.

Example:

Ek police officer kisi vyakti ko arrest karta hai kyunki use reasonable belief hai ki warrant valid hai. Baad mein pata chalta hai ki warrant mein factual error tha.

Agar officer ne honestly aur good faith mein kaam kiya tha, to Section 47 uski protection kar sakta hai.

Important baat:

  • Mistake of Fact protected ho sakti hai.

  • Mistake of Law protected nahi hoti.

Legal Definition (Original Law Text)

BNS Section 47 substantially provides that nothing is an offence which is done by any person who is justified by law, or who by reason of a mistake of fact and not by reason of a mistake of law, in good faith believes himself to be justified by law in doing it.

Practical Interpretation

Courts generally verify:

  1. Whether a mistake existed.

  2. Whether the mistake related to facts and not law.

  3. Whether the belief was genuine.

  4. Whether the act was performed in good faith.

  5. Whether the person reasonably believed the act was legally justified.

If these requirements are satisfied, criminal liability may not arise.

Punishment & Legal Classification

Punishment: No punishment prescribed.

Bailable / Non-bailable: Not applicable.

Cognizable / Non-cognizable: Not applicable.

Compoundable: Not applicable.

Triable by: Not applicable.

BNS Section 47 is a legal exception and does not create an offence.

IPC ↔ BNS Mapping

IPC Section: Section 79 IPC

BNS Equivalent: Section 47 BNS

Status: Replaced by Bharatiya Nyaya Sanhita, 2023.

The legal principle remains substantially unchanged.

Real-Life Examples

Example 1: Police Officer Arresting the Wrong Person

A police officer receives reliable information that a particular individual is the subject of a valid arrest warrant. Acting in good faith, the officer arrests the person. Later, it is discovered that there was a factual identification error.

Since the officer acted under a genuine mistake of fact, Section 47 may provide protection.

Example 2: Citizen Assisting Police

A citizen helps police officers detain an individual whom he honestly believes to be a wanted criminal. Later, the suspect is found innocent.

If the citizen acted reasonably and in good faith, protection may be available.

Example 3: Recovery of Property

A person retrieves a bag believing it belongs to him because it closely resembles his own property. Upon opening it, he discovers it belongs to another individual.

If the mistake was genuine and based on facts, criminal intention may be absent.

Landmark Judgments

Case Name: State of Orissa v. Ram Bahadur Thapa

Court: Supreme Court of India

Key Takeaway: A bona fide mistake of fact may exclude criminal liability when the accused acts honestly and reasonably.

Case Name: Basdev v. State of Pepsu

Court: Supreme Court of India

Key Takeaway: Criminal liability often depends upon the existence of the required mental element.

Case Name: Keso Sahu v. Saligram Shah

Court: Judicial precedent frequently cited in discussions involving mistake of fact.

Key Takeaway: Good faith and reasonableness are essential for claiming protection.

These cases illustrate how courts evaluate honest mistakes and criminal responsibility.

Legal Insights

When is this Section Applied?

Section 47 commonly applies in situations involving:

  • Wrongful arrests based on mistaken identity.

  • Mistaken ownership disputes.

  • Execution of official duties.

  • Citizen assistance to authorities.

  • Good faith reliance on factual information.

  • Misidentification cases.

Common Misuse Scenarios

Claiming Ignorance of Law

Many accused persons argue that they did not know the law.

This is generally not protected because Section 47 applies to mistakes of fact, not mistakes of law.

Fabricated Mistake

An accused may falsely claim a factual misunderstanding after committing an offence.

Courts carefully evaluate evidence before accepting such claims.

Unreasonable Beliefs

Protection may not apply where the alleged mistake was clearly unreasonable.

Defenses Available

Common defenses include:

  • Good faith.

  • Honest belief.

  • Mistake of fact.

  • Lack of criminal intention.

  • Reasonable conduct.

  • Legal justification.

Courts examine whether a prudent person could have made a similar mistake under the circumstances.

Difference Between Mistake of Fact and Mistake of Law

This distinction is crucial.

Mistake of Fact

Example:

A person takes another person's umbrella believing it is his own.

Protection may apply.

Mistake of Law

Example:

A person knows the umbrella belongs to someone else but believes taking it is legally permitted.

Protection generally does not apply.

The law presumes that everyone knows the law, but it recognizes that mistakes about facts can occur honestly.

Importance of Good Faith

Good faith is one of the most important requirements under Section 47.

Courts consider:

  • Honest belief.

  • Reasonable inquiry.

  • Absence of malice.

  • Conduct before and after the incident.

  • Available information at the time.

A person cannot deliberately ignore obvious facts and later claim good faith.

Importance of BNS Section 47

Section 47 reflects a fundamental principle of criminal law:

"An act done honestly under a genuine mistake of fact should not automatically attract criminal liability."

The provision ensures fairness by protecting individuals who act reasonably and without criminal intent.

Without such protection:

  • Honest mistakes could lead to criminal prosecution.

  • Public officials might hesitate to perform duties.

  • Citizens could fear assisting law enforcement.

Modern Relevance

In modern society, decisions are often made quickly based on available information.

Examples include:

  • Digital identity verification.

  • Online transactions.

  • Law enforcement operations.

  • Security checks.

  • Property disputes.

Mistakes of fact can occur despite reasonable care. Section 47 provides a framework for evaluating such situations fairly.

Conclusion

BNS Section 47 is an important legal safeguard protecting individuals who act under lawful authority or under a genuine mistake of fact while believing themselves justified by law. The section recognizes that criminal liability should generally be based on wrongful intention and not honest factual misunderstandings. By distinguishing between mistakes of fact and mistakes of law, the provision promotes fairness, justice, and reasonable accountability within India's criminal justice system.

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

BNS Section 47 protects acts done under legal justification or under a genuine mistake of fact.

No. It is a legal exception.

No punishment is prescribed because it does not create an offence.

The section itself is neither bailable nor non-bailable.

The IPC equivalent is Section 79 IPC.

It is an incorrect belief regarding factual circumstances.

Generally, no.

Yes. Good faith is essential.

Yes, where they act under a genuine mistake of fact and in good faith.

It protects honest actions performed under factual misunderstandings and promotes fairness in criminal law.
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