Section 21 explained: this guide covers what it means, who it applies to, the step-by-step process, documents required, fees, due dates and penalties in India — so you can stay compliant with confidence and avoid costly mistakes.
Section 21 says what date counts for limitation when a new plaintiff or defendant is added or substituted after a suit has started. As against the new party, the suit is deemed instituted on the date that party was made a party. A proviso allows an earlier date where the omission was a good-faith mistake, and sub-section (2) lists cases where the rule does not apply.
This article follows the consolidated text of the Act consulted (latest amendment shown: Act 46 of 1999). Later amendments should be checked before you rely on it.
Under section 21(1), when a new plaintiff or defendant is substituted or added after the suit is instituted, the suit is deemed instituted, as regards him, when he was made a party. The proviso lets the court direct an earlier date if the omission was due to a mistake made in good faith. Under section 21(2), the rule does not apply where a party is added or substituted owing to assignment or devolution of an interest during the suit, or where a plaintiff becomes a defendant or a defendant a plaintiff.
Section 21(1): the rule
Section 21(1) reads: "Where after the institution of a suit, a new plaintiff or defendant is substituted or added, the suit shall, as regards him, be deemed to have been instituted when he was so made a party".
Why this matters: the suit was instituted against the original parties on a particular date (see section 3(2)(a), covered in sections 3 and 4). If someone else is brought in later, the question is whether time is tested at the original date or the later date. Section 21(1) answers: as regards the new party, at the later date, when he was made a party.
| Situation | Date of institution as regards the new party |
|---|---|
| A new plaintiff is substituted or added | When he was made a party |
| A new defendant is substituted or added | When he was made a party |
| The omission was due to a mistake made in good faith (proviso) | An earlier date, if the court so directs |
An illustration with invented names: Sunrise Traders files a suit against Kumar Brothers on 1 February 2026 for the price of goods. On 1 September 2026, the court adds Kumar and Sons as a second defendant. As regards Kumar and Sons, the suit is deemed instituted on 1 September 2026. If the Schedule period for the claim expired on 1 June 2026, the claim against Kumar and Sons is tested against 1 September 2026, not 1 February 2026, unless the proviso is invoked.
If you are filing a suit and are unsure which parties to join, a commercial suit filing consultation before the plaint is presented helps reduce the need to add parties later.
The proviso: mistake made in good faith
The proviso reads: "Provided that where the court is satisfied that the omission to include a new plaintiff or defendant was due to a mistake made in good faith it may direct that the suit as regards such plaintiff or defendant shall be deemed to have been instituted on any earlier date."
Features of the proviso:
- The court must be satisfied that the omission was due to a mistake made in good faith.
- The word is "may direct", so it is the court's power, not an entitlement.
- The earlier date is "any earlier date": the text does not name one. The court may direct that the suit be deemed instituted as regards the new party on an earlier date.
"Good faith" has a meaning in the Act: section 2(h) says nothing is deemed to be done in good faith which is not done with due care and attention. See sections 1 and 2. The proviso does not list what mistakes qualify. This article does not give examples of what a court will accept.
Continuing the illustration: if the court were satisfied that leaving out Kumar and Sons was due to a mistake made in good faith, it may direct that the suit as regards Kumar and Sons be deemed instituted on an earlier date, such as 1 February 2026. Whether it does so is for the court to decide.
Section 21(2): where sub-section (1) does not apply
Section 21(2) reads: "Nothing in sub-section (1) shall apply to a case where a party is added or substituted owing to assignment or devolution of any interest during the pendency of a suit or where a plaintiff is made a defendant or a defendant is made a plaintiff."
Two cases are outside the rule:
| Case | Why sub-section (1) is not applied |
|---|---|
| A party is added or substituted owing to assignment or devolution of any interest during the pendency of the suit | The text excludes it |
| A plaintiff is made a defendant, or a defendant is made a plaintiff | The text excludes it (transposition) |
For the first case, the party's interest comes through the existing party by assignment or devolution. For the second, the person was already a party and has only changed side. In neither is there a "new" party in the sense of sub-section (1).
The text does not say what date applies in those cases instead. It only says sub-section (1) does not apply. Section 2 widens "plaintiff" and "defendant" to include persons from or through whom they derive a right or liability, which can be relevant to such cases; the Act does not say more, and this article does not either.
Links to other sections
- Section 3(2)(b) treats a set off or counter claim as a separate suit with its own date of institution; see sections 3 and 4.
- Section 14 can exclude time spent in an earlier proceeding where there was misjoinder of parties, since the Explanation to that section treats misjoinder as a cause like defect of jurisdiction; see section 14. That is a different provision from section 21, and the two should be read separately.
- Section 16 deals with legal representatives of a deceased party before a right accrues; see section 16.
For how parties are named in a suit, see suits, parties and cause of action under the CPC.
Special laws
Section 29(2) lets a special or local law fix its own period and applies sections 4 to 24 to it only so far as that law does not expressly exclude them. Never apply a Schedule period to a tax, insolvency, company, arbitration, consumer, MSME or cheque dishonour proceeding; check the special law. Our post on the meaning of commercial dispute under the Commercial Courts Act, 2015 is an example of a special law with its own rules.
Need help deciding who to sue?
Naming the right parties at the start can avoid a later date of institution against a party who was added late. We can review your claim, the parties and the dates with you through commercial suit filing support before you file.
Key takeaways
- Section 21(1): a new plaintiff or defendant substituted or added after the suit began is treated as having been sued, or as suing, from the date made a party.
- The proviso lets the court direct an earlier date where the omission was due to a mistake made in good faith.
- The proviso says "may direct": the court decides.
- Section 21(2) excludes parties added or substituted owing to assignment or devolution of an interest during the suit, and transposition of plaintiff and defendant.
- A special or local law may fix a different period (section 29(2)).
Read next
- Section 20: acknowledgment or payment by guardian, agent, partner or family manager
- Sections 22–24: continuing breach, continuing tort, special damage and Gregorian calendar
- Section 14: exclusion of time spent in a court without jurisdiction
- Plaint: structure, essential parts and drafting guide
Disclaimer: Based on a consolidated text of the Limitation Act, 1963 and its Schedule whose latest amendment shown is Act 46 of 1999, as consulted on 2 October 2026. A special or local law may fix a different period; later amendments and the current procedural law should be checked. This article is general information, not legal advice; check the official text before acting.