Under Indian law, an undertrial prisoner detained for half the maximum sentence prescribed for the offence must be released, a rule carried over from Section 436A CrPC into Section 479 BNSS. Section 479 BNSS goes further, adding a new one-third threshold for first-time offenders, barring release where multiple cases are pending, and requiring the jail superintendent to apply for release — while excluding offences punishable with life imprisonment, not death alone, from the section.
The situation
A person has been in judicial custody as an undertrial — arrested and denied or unable to secure bail — for an extended period while investigation, inquiry or trial continues. Neither the accused nor their family is sure how long detention can lawfully continue without a conviction, or whether the length of custody already served entitles them to release regardless of how the case is proceeding.
Old law vs new law at a glance
| Issue | Section 436A CrPC | Section 479 BNSS | What changed |
|---|---|---|---|
| General release threshold | Detention for one-half of the maximum prescribed sentence | Detention for one-half of the maximum prescribed sentence | Identical |
| First-time offender threshold | No separate threshold | First proviso: release on bond after one-third of the maximum prescribed sentence, for a person "who has never been convicted of any offence in the past" | New provision |
| Offences excluded from the section | Offences "for which the punishment of death has been specified" | Offences "for which the punishment of death or life imprisonment has been specified" | Narrowed — life-imprisonment offences now also excluded |
| Mode of release for general case | Personal bond, with or without sureties | Released "by the Court on bail" | Wording changed from personal bond to bail |
| Mode of release for first-time offender | Not applicable | Released "on bond by the Court" | New |
| Court's power to extend detention beyond the threshold | First proviso: for recorded reasons, after hearing the Public Prosecutor, continued detention or release "on bail instead of the personal bond with or without sureties" | Second proviso: for recorded reasons, after hearing the Public Prosecutor, continued detention or release "on bail bond instead of his bond" | Same substance; the alternative is re-worded to match the new bond/bail-bond terminology |
| Absolute ceiling on detention | Second proviso: not beyond the maximum imprisonment period for the offence | Third proviso: not beyond the maximum imprisonment period for the offence | Identical |
| Exclusion of accused-caused delay from the computation | Explanation | Explanation | Identical |
| Bar where multiple cases are pending | No equivalent provision | Sub-section (2): no release under this section if investigation, inquiry or trial in more than one offence or multiple cases is pending | New provision |
| Duty to apply for release | No equivalent provision; the section imposed no duty on jail authorities | Sub-section (3): Superintendent of jail must forthwith apply in writing to the Court on completion of the relevant period | New provision |
What the law requires now, step by step
Step 1 — Track the detention clock from the start of investigation, inquiry or trial
Section 479(1) BNSS opens the same way Section 436A CrPC did: the clock runs on time spent "during the period of investigation, inquiry or trial under this Sanhita" for an offence, measured against "the maximum period of imprisonment specified for that offence under that law."
Step 2 — Check whether the offence is excluded
Section 479(1) BNSS excludes any offence "for which the punishment of death or life imprisonment has been specified as one of the punishments under that law." Section 436A CrPC excluded only offences "for which the punishment of death has been specified as one of the punishments." An offence punishable with life imprisonment (but not death) therefore sits outside Section 479 BNSS even though it would have been within the reach of Section 436A CrPC.
Step 3 — Determine whether the one-half or the one-third threshold applies
For an accused who is not a first-time offender, Section 479(1) BNSS states:
"he shall be released by the Court on bail"
once detention has extended "up to one-half of the maximum period of imprisonment specified for that offence." The first proviso creates a separate, lower threshold for a first-time offender:
"where such person is a first-time offender (who has never been convicted of any offence in the past) he shall be released on bond by the Court, if he has undergone detention for the period extending up to one-third of the maximum period of imprisonment specified for such offence under that law"
Neither the section nor its proviso defines "first-time offender" beyond this parenthetical — a person with no prior conviction, on the section's own words.
Step 4 — Check the multiple-case bar
Section 479(2) BNSS states:
"Notwithstanding anything in sub-section (1), and subject to the third proviso thereof, where an investigation, inquiry or trial in more than one offence or in multiple cases are pending against a person, he shall not be released on bail by the Court."
This restriction applies regardless of whether the person would otherwise qualify under the one-half or one-third threshold, subject to the absolute ceiling in the third proviso to sub-section (1) (detention cannot in any case exceed the maximum sentence for the offence).
Step 5 — The jail superintendent's duty to apply
Section 479(3) BNSS places an affirmative duty on the prison system:
"The Superintendent of jail, where the accused person is detained, on completion of one-half or one-third of the period mentioned in sub-section (1), as the case may be, shall forthwith make an application in writing to the Court to proceed under sub-section (1) for the release of such person on bail."
Section 436A CrPC contained no equivalent — it imposed no duty on the jail superintendent or any other authority to apply for release.
Step 6 — The court's power to extend detention or vary the mode of release
Both provisions allow the court to depart from automatic release, but only after hearing the Public Prosecutor and recording reasons in writing. The second proviso to Section 479(1) BNSS states the court may, on that basis, "order the continued detention of such person for a period longer than one-half of the said period or release him on bail bond instead of his bond" — carrying over the CrPC's first proviso, which already allowed the court to order continued detention or "release him on bail instead of the personal bond with or without sureties"; only the wording of the alternative changed.
Step 7 — The absolute ceiling and the delay exclusion
The third proviso to Section 479(1) BNSS states that "no such person shall in any case be detained during the period of investigation, inquiry or trial for more than the maximum period of imprisonment provided for the said offence" — mirroring the second proviso to Section 436A CrPC. The Explanation to Section 479 BNSS then excludes, from the detention computation, "the period of detention passed due to delay in proceeding caused by the accused" — again mirroring the CrPC's Explanation.
What changed — and what did not
- New provision: The one-third threshold for first-time offenders in the first proviso to Section 479(1) BNSS has no counterpart in Section 436A CrPC.
- New provision: The multiple-case bar in Section 479(2) BNSS is entirely new — Section 436A CrPC did not restrict release based on other pending matters.
- New provision: The jail superintendent's mandatory duty to apply for release in Section 479(3) BNSS is new — the old section placed no comparable obligation on prison authorities.
- Narrowed: The class of offences to which the section applies at all is narrower under Section 479 BNSS, because it excludes offences punishable with life imprisonment in addition to those punishable with death.
- Identical in substance: The one-half threshold for the general case, the court's power to extend detention for recorded reasons after hearing the Public Prosecutor, the absolute ceiling at the maximum sentence, and the exclusion of accused-caused delay from the computation all carry over from Section 436A CrPC to Section 479 BNSS without change of substance.
Which law applies to your case
If the relevant detention, investigation or trial straddles 1 July 2024, whether Section 436A CrPC or Section 479 BNSS governs depends on the savings rule at Section 531 BNSS, not on when the detention began. The full rule is set out in Which Law Applies to an Offence Before 1 July 2024. This article does not restate that rule beyond the reference.
Practical checklist
For the undertrial or their family:
- Note the offence's maximum prescribed sentence and calculate both the one-half and, if no prior conviction exists, the one-third mark.
- Check whether any other investigation, inquiry or trial is pending against the accused in a different case — this can bar release under Section 479(2) BNSS even where the detention threshold is otherwise met.
- Ask the jail authorities whether an application under Section 479(3) BNSS has already been made on the accused's behalf.
- Keep records of any delay in the proceedings caused by the defence, since that period is excluded from the detention computation under the Explanation.
For the advocate:
- Confirm which offence's maximum sentence governs the computation where multiple charges exist, and verify the offence is not one carrying death or life imprisonment as a specified punishment, which would take it outside Section 479 BNSS entirely.
- Verify "first-time offender" status by checking for any prior conviction before relying on the one-third threshold.
- Where the prosecution opposes release, confirm reasons have actually been recorded in writing after hearing the Public Prosecutor, as the second proviso to Section 479(1) requires.
- If the jail superintendent has not applied under Section 479(3), consider whether to move the application directly rather than wait.
Frequently asked questions
What is the one-third rule for undertrial release under Section 479 BNSS?
Section 479(1), first proviso, BNSS states that a first-time offender — defined in the same proviso as a person "who has never been convicted of any offence in the past" — must be released on bond once detention during investigation, inquiry or trial reaches one-third of the maximum term of imprisonment prescribed for the offence. This threshold did not exist under Section 436A CrPC, which used a single one-half threshold for every eligible undertrial.
Did Section 436A CrPC have any one-third release provision?
No. Section 436A CrPC provided only a single threshold: release on personal bond, with or without sureties, once an undertrial had been detained for one-half of the maximum sentence prescribed for the offence (other than an offence punishable with death). The one-third first-time-offender track is new to Section 479 BNSS.
Can I be refused release under Section 479 BNSS if I have other cases pending against me?
Section 479(2) BNSS states that, notwithstanding sub-section (1), a person shall not be released on bail under this section where investigation, inquiry or trial in more than one offence or in multiple cases is pending against them. Section 436A CrPC had no equivalent restriction.
Who is responsible for applying for my release under Section 479 BNSS?
Section 479(3) BNSS places the duty on the Superintendent of the jail where the accused is detained: on completion of one-half or one-third of the relevant period, the Superintendent must forthwith make a written application to the Court for the person's release. Section 436A CrPC imposed no application duty on jail authorities or any other authority.
Does Section 479 BNSS apply to offences punishable with life imprisonment?
No. Section 479(1) BNSS excludes "an offence for which the punishment of death or life imprisonment has been specified as one of the punishments under that law." Section 436A CrPC excluded only offences punishable with death, not those punishable with life imprisonment — so the new provision applies to a narrower band of offences than the old one on this point.
Which law applies if my detention began before 1 July 2024?
This guide does not restate the general transition rule. See the dedicated article on which law applies to a matter that straddles the 1 July 2024 commencement date, read together with Section 531 BNSS.
Related on Veritect
- Which Law Applies to an Offence Before 1 July 2024
- Bail Provisions — Old CrPC vs New BNSS Comparison
- Section 167 CrPC — Remand and Default Bail
- Accused Absconds: Proclamation, Attachment and Trial in Absence — CrPC 82-86, 299 vs BNSS 84-89, 356
- Settling a Criminal Case: Which Offences Can Be Compounded — CrPC 320 vs BNSS 359
- CrPC to BNSS: Complete Section Mapping
- Section 436A CrPC vs Section 479 BNSS — Maximum Period an Undertrial Prisoner Can Be Detained
Statutory sources
- Bharatiya Nagarik Suraksha Sanhita, 2023 — Section 479(1)-(3) (read from BNSS_2023.md)
- Code of Criminal Procedure, 1973 — Section 436A (read from CrPC_1973.md)
This guide explains the statutory text of the BNS, BNSS and BSA as enacted. It is not legal advice; for a specific case, consult an advocate.