Actus reus (Latin: "guilty act") is the physical element of a criminal offence — the external conduct, whether an act or an omission, that is prohibited by law. Under Indian criminal law, the concept is embedded in the Indian Penal Code, 1860 through Sections 32 and 33, which define "act" and "omission" (now Sections 33 and 34 of the Bharatiya Nyaya Sanhita, 2023).
Legal definition
The Indian Penal Code, 1860 does not use the Latin term "actus reus" but provides the statutory foundation:
Section 32 IPC: In every part of this Code, except where a contrary intention appears from the context, words which refer to acts done extend also to illegal omissions.
Section 33 IPC: The word "act" denotes as well a series of acts as a single act; the word "omission" denotes as well a series of omissions as a single omission.
Actus reus encompasses not only positive acts (striking, stealing, forging) but also criminal omissions — a failure to act where a legal duty to act exists. For example, a parent who starves a child to death commits murder through omission.
The concept extends beyond the immediate act to include: the act itself, the circumstances in which the act is done, and the consequences of the act. All three must be established for criminal liability.
New law equivalent: Under the BNS, 2023, Sections 33 and 34 correspond to Sections 32 and 33 IPC. A notable addition in the BNS is Section 40, which creates an affirmative duty to assist a person in danger when the person can do so without risk to themselves — expanding the scope of criminal omissions.
How courts have interpreted this term
Ratanlal v. State of Madhya Pradesh [AIR 1971 SC 778]
The Supreme Court held that for criminal liability, there must be an actus reus coupled with mens rea. The Court emphasised that a mere intention to commit an offence is not punishable — the intention must be translated into action, or at least into an attempt that constitutes a step towards the commission of the offence.
Suresh v. State of U.P. [(2001) 3 SCC 673]
The Supreme Court discussed the concept of criminal omission and held that where a person has a legal duty to act and their failure to act results in a prohibited consequence, the omission constitutes actus reus. The duty may arise from statute, contract, relationship, or from the accused's own creation of a dangerous situation.
Sushil Ansal v. State through CBI [(2014) 6 SCC 173 (Uphaar Fire Case)]
The Supreme Court examined the concept of criminal negligence and held that negligence constitutes actus reus when the conduct falls so far below the standard of reasonable care that it amounts to criminal recklessness. The failure to maintain fire safety measures in a cinema hall, resulting in the deaths of 59 persons, was held to constitute the physical element of criminal negligence.
Why this matters
Actus reus, together with mens rea, forms the twin foundation of criminal liability in every legal system. No person can be convicted of a criminal offence unless the prosecution proves both elements — the guilty act and the guilty mind. This principle protects individuals from punishment for mere thoughts, wishes, or idle threats that are never acted upon.
For practitioners, the critical analytical questions are: Has the accused done a prohibited act (or made a prohibited omission)? Were the relevant circumstances present? Did the act cause the prohibited consequence? Each of these must be established beyond reasonable doubt. In many cases, the actus reus is straightforward — the accused struck the victim, took the property, or forged the document. In complex cases involving omissions, causation, or shared liability, the analysis becomes more nuanced.
The expansion of criminal omissions under Section 40 BNS represents a significant development. For the first time, Indian law creates a general duty to assist persons in danger. While the scope and enforcement of this provision remain to be tested, it signals a legislative intent to broaden the definition of culpable inaction.
Related terms
Twin pillar:
Related forms of criminal conduct:
Frequently asked questions
Can a person be punished for an omission under Indian law?
Yes. Under Section 32 IPC (Section 33 BNS), words referring to acts extend to illegal omissions. Where a person has a legal duty to act and fails to do so, resulting in a prohibited consequence, the omission constitutes actus reus. The BNS additionally introduces a general duty to assist persons in danger under Section 40.
What is the difference between actus reus and mens rea?
Actus reus is the physical or external element of the offence — the act, omission, or conduct prohibited by law. Mens rea is the mental or internal element — the intention, knowledge, or recklessness with which the act is done. Both must be proved for criminal liability, subject to exceptions for strict liability offences.
Does mere preparation constitute actus reus?
Generally, no. Indian law distinguishes between preparation and attempt. Mere preparation to commit an offence is not punishable, whereas an attempt — which involves an act done towards the commission of the offence beyond mere preparation — is punishable under Section 511 IPC (Section 62 BNS).
This entry is part of the Veritect Indian Legal Glossary, a comprehensive reference of Indian legal terminology grounded in statutory text and judicial interpretation.
Last updated: 2026-03-27. Veritect provides this content for informational purposes and does not constitute legal advice.