Casus omissus is the rule that a court will not supply what the legislature has left out of a statute. The omission can be supplied only where the necessity is clear and the reason for supplying it appears within the four corners of the Act.
In 2026, in Dr Lokesh B.H. v. State of Karnataka, the Supreme Court repeated the classical warning that a judge must not strain the words of a penal statute on a notion that there has been a casus omissus. It then held that “husband” in Section 498A of the Indian Penal Code, 1860 is not confined to a man in a legally valid marriage. The way the Court described what it was doing matters as much as the result it reached, because it did not say that it was filling a gap, but that it was construing a word which the statute had never defined. That distinction, between supplying words and construing them, is where most arguments on this maxim are won and lost.
This article sets out what casus omissus means and when a court will supply the omission.
The rule only begins to operate once a statute is genuinely silent on a situation which it looks as though it ought to have covered, so the question worth working through first is what a court does with that silence. Suppose a state rent Act allows a landlord to recover possession of premises on a bona fide requirement of those premises “for himself or for his son”.
A widowed landlord who has only a daughter applies on exactly that ground. The daughter’s need is genuine, and the hardship of refusing the application is obvious to anyone reading the file. The words of the section, however, do not reach her at all.
The court’s first question is not whether that gap is unfair, because unfairness on its own decides nothing. The question is whether the reason for filling the gap can be found inside the Act, in its definitions, in its other sub-sections and in the scheme it sets up. If nothing in the Act supplies that reason, the omission stands and the remedy lies with the legislature rather than with the court. The sections that follow show how the courts have drawn that line.
Interpretation of statutes: casus omissus rule
The casus omissus rule sits at the outer edge of the interpretation of statutes, and it marks the point at which the ordinary rules of construction stop being able to help. Interpretation of statutes is needed at all because the words of an Act have to be applied to facts which nobody had in front of them when the Act was drafted. A judge reading a section is therefore not asking what the drafter privately intended, but what the words, read in their setting, are capable of carrying.
Three rules do most of that work, and it helps to have them in order before the maxim itself is introduced. The literal rule takes the words as they stand and gives them their ordinary meaning. The golden rule allows a literal reading to be bent where it would produce an absurdity, provided the words remain capable of the meaning given to them. The mischief rule, which comes from Heydon’s case, asks what defect the earlier law did not provide for and what remedy the legislature resolved upon, and then reads the section so as to suppress the mischief and advance the remedy.
Casus omissus is the boundary marker for all three of them. Each of those rules assumes that the words do reach the facts and then argues about how far they reach, which is a question of construction. This maxim answers a different question altogether, which is what a court should do when the words do not reach the facts at all, and the answer it gives is that the court does not stretch them until they do.
What do you mean by casus omissus?
A casus omissus is a case which the statute has left out, meaning a situation that its words do not cover although it looks as though they should have. The Latin phrase translates, literally, as an omitted case. The rule which has attached itself to the phrase is a rule of restraint, and it is that a court does not supply what the legislature did not enact.
Where a statute is silent, that silence has to be genuine before the rule is even reached, which is why the leading authority states two principles rather than one. In Padmasundara Rao (Dead) and Ors. v. State of Tamil Nadu and Ors., (2002) 3 SCC 533, which was decided on 13 March 2002 by a Constitution Bench of five judges on Section 6 of the Land Acquisition Act, 1894, the Court held that “under the first principle a casus omissus cannot be supplied by the Court except in the case of clear necessity and when reason for it is found in the four corners of the statute itself”. The second principle is that all the parts of a statute or section must be construed together, so that a casus omissus is not readily inferred. Although the first principle is stated first, it is the second which does its work first in practice, because you have to establish that the gap is real before you can argue about filling it.
It is worth separating an omission from an ambiguity at this stage, because the two attract different treatment and are easily run together. An ambiguity is a provision which bears more than one meaning, and it is resolved in the ordinary way, by context, the scheme of the Act and its object. An omission is a provision which bears no meaning at all for the situation in front of the court, and it is not resolved unless the narrow exception applies. Most apparent omissions close once the definition clause and the neighbouring sub-sections are read alongside the provision, which is why so few arguments of this kind survive the second principle.
Where does casus omissus apply?
The rule applies wherever a statute’s words run out on facts which plainly fall within its subject matter. Amendments throw up most of these arguments, because a drafter revising one sub-section can very easily leave another one stranded. Renumbered codes, eligibility rules and rewritten procedural sections account for much of the rest. Two examples taken up later in this article show how that happens: the 2002 amendment to Section 25 of the Consumer Protection Act, 1986, and the 1999 amendment to Section 115 of the Code of Civil Procedure, 1908.
Knowing where the rule does not apply matters just as much, because treating either of the following as a genuine gap will waste a submission. A deliberate legislative choice is not an omission, however unwelcome it may be to the party affected by it, and neither is a provision which is merely inconvenient to work with. The reason the rule holds firm in both situations is the one Padmasundara Rao gave. The language employed in a statute is the determinative factor of legislative intent, and while interpreting a provision the court only interprets the law and cannot legislate it.
When does a court refuse to supply a casus omissus?
A court refuses to supply a casus omissus whenever the words of the provision are plain, and it refuses however inconvenient the result of reading them that way may be. The reason for the refusal is constitutional rather than technical, because the remedy for a statute which is plain but unsatisfactory is an amendment passed by the legislature and not a construction imposed by a court. Padmasundara Rao put that consequence in a single line, holding that if a provision of law is misused and subjected to the abuse of process of law, “it is for the legislature to amend, modify or repeal it, if deemed necessary”.
The strongest statement of the refusal is fifty years old and is still the one that gets cited. In The Commissioner of Sales Tax, U.P. v. Parson Tools and Plants, Kanpur, (1975) 4 SCC 22, the Supreme Court held that if the legislature wilfully omits to incorporate something of an analogous law in a subsequent statute, or even if there is a casus omissus in a statute whose language is otherwise plain and unambiguous, “the Court is not competent to supply the omission by engrafting on it or introducing in it, under the guise of interpretation, by analogy or implication, something what it thinks to be a general principle of justice and equity”. What that passage shuts out is not a strained reading of the words but something else entirely, which is the appeal to justice and equity that counsel tend to reach for once the words have run out.
The fullest reasoning is set out in Shiv Shakti Coop. Housing Society, Nagpur v. Swaraj Developers and Ors., decided on 17 April 2003 on the 1999 amendment to Section 115 of the Code of Civil Procedure, 1908. “A statute is an edict of the Legislature,” the Court said there, and “it is well settled principle in law that the Court cannot read anything into a statutory provision which is plain and unambiguous.” It then adopted the older English formulation, under which a casus omissus “ought not to be created by interpretation, save in some case of strong necessity”, and under which a casus omissus “can in no case be supplied by a court of law, for that would be to make laws”.
None of this should be treated as settled history which no longer bites, because the same rule was applied to a modern commercial statute only last year. In Independent Sugar Corporation Ltd. v. Girish Sriram Juneja, 2025 INSC 124, decided on 29 January 2025, the Supreme Court read the proviso to Section 31(4) of the Insolvency and Bankruptcy Code, 2016 exactly as it stands. It held that approval of the Competition Commission of India must be obtained before the committee of creditors examines a resolution plan containing a combination. The argument that the approval could safely be obtained later did not survive the plain words. The principle of casus omissus, the Court explained, “cautions the courts against transgressing into the legislative domain”, and “the courts should not arrogate the legislature’s role by filling gaps in statutory text”.
Why do taxing and penal statutes get the strictest reading?
Taxing and penal statutes receive the strictest reading of all, and the reason is that the subject is entitled to know, from the words of the statute alone, what he owes to the revenue and what conduct will make him criminally liable. Nobody can arrange his affairs around a tax which has to be inferred, and nobody can keep clear of a punishment which has to be inferred either. It follows that the submission that a gap defeats the object of the Act carries less weight in these statutes than it carries anywhere else in the law.
The classical statement of that caution appears in the Supreme Court’s 2026 judgment in Dr Lokesh B.H. and Ors. v. State of Karnataka and Anr., 2026 INSC 784. Quoting Dyke v. Elliott (1872), the Court repeated that in a penal statute “the court must see that the thing charged as an offence is within the plain meaning of the words used, and must not strain the words on any notion that there has been a slip, that there has been a casus omissus, that the thing is so clearly within the mischief that it must have been intended to be included if thought of”. It placed that alongside the related warning that it would be dangerous to punish a crime not enumerated in the statute “because it is of equal atrocity, or of kindred character, with those which are enumerated”.
What the Court then did with that caution is the part to hold on to. It held that the term “husband” in Section 498A is not confined to a man in a legally valid marriage, but extends to a man in a relationship bearing the essential characteristics of marriage. It arrived at that result without ever treating itself as having supplied an omission. Its reasoning was that although penal statutes must receive strict construction, the light of that principle “cannot dim the objective” of the provision. Because “husband” had never been defined by the statute, reading it against the mischief was an act of construction rather than gap-filling. Whether a court is supplying words or construing them is therefore very often the whole of the argument, and it is worth settling which of the two you are asking for before you stand up.
Where the omission defeats the object of the Act
Where the plain words of a provision defeat the object of the Act, a court may add, omit or substitute words, and the fullest statement of that power is found in Afcons Infrastructure Ltd. v. Cherian Varkey Construction Co. (P) Ltd., (2010) 8 SCC 24. Where the words used are vague and ambiguous, the Court said there, or where their plain meaning “would lead to confusion, absurdity, repugnancy with other provisions”, the courts may “use the interpretative tools to set right the situation, by adding or omitting or substituting the words in the statute”. Faced with a provision which appears defective, courts prefer to assume that the draftsman made a mistake rather than conclude that the legislature deliberately enacted something irrational.
Two limits sit inside that same passage, and together they explain why the exception has never swallowed the rule. The first is that departure from the literal rule “can however be only in exceptional cases, where the anomalies make the literal compliance with a provision impossible, or absurd or so impractical as to defeat the very object of the provision”. The second is that the technique is employed more readily on procedural provisions than on substantive ones, which is why the successful examples tend to cluster in procedure and in eligibility rather than in liability.
The older authority explains when a court is entitled to think that a slip has occurred at all, which is the threshold question. In Surjit Singh Kalra v. Union of India, (1991) 2 SCC 87, the Supreme Court adopted the formulation in Craies on Statute Law, under which it is not permissible to read words into a statute which are not there, but “where the alternative lies between either supplying by implication words which appear to have been accidentally omitted, or adopting a construction which deprives certain existing words of all meaning, it is permissible to supply the words”. The trigger, then, is not hardship to a party but something visible on the face of the provision itself, which is that some other part of it has been left with nothing to do.
The cleanest Indian illustration is a drafting mistake which the Court corrected in terms. In Salem Advocate Bar Association (II) v. Union of India, (2005) 6 SCC 344, the Supreme Court found that Order 7 Rule 14(4) of the Code of Civil Procedure, 1908 said “plaintiff’s witnesses” where the scheme of Orders 7 and 8 required “defendant’s witnesses”, and it directed that “till the legislature corrects the mistake, the words ‘plaintiff’s witnesses’, would be read as ‘defendant’s witnesses’”. The correction was possible only because the surrounding scheme showed, beyond argument, what the sub-rule had been meant to say.
Rajbir Singh Dalal v. Chaudhari Devi Lal University, (2008) 9 SCC 284 did the same thing to a qualification rule, reading the words “relevant subject” into a rule prescribing qualifications for the post of Reader, after the words “at the Master’s degree level”. That judgment repays study for a second reason, which is that it collects four earlier instances of the same technique, among them the reading of “any person interested in a waqf” as “any person interested in what is held to be a waqf”. Every one of those corrections is the same size, a single word or phrase anchored in the surrounding text, and an argument which does not fit that pattern rarely succeeds.
The conditions a court applies before departing from the plain words
Before a court departs from the plain words of a statute it has to be satisfied of four things, and these operate cumulatively rather than as factors to be weighed against one another. Afcons takes them from Justice G.P. Singh’s Principles of Statutory Interpretation, which takes them in turn from the decision of the House of Lords in Stock v. Frank Jones (Tipton) Ltd., (1978) 1 WLR 231. They are worth working through in order, because an argument which fails any one of them fails altogether.
The first condition is that there is a clear and gross balance of anomaly. The second is that Parliament, the legislative promoters and the draftsman “could not have envisaged such anomaly, could not have been prepared to accept it in the interest of a supervening legislative objective”. This second condition defeats more arguments than the other three put together, because a legislature is often quite willing to live with a rough edge in one provision in order to secure a larger object elsewhere in the Act.
The third condition is that the anomaly can be obviated without detriment to that legislative objective. The fourth is that the language of the statute “is susceptible of the modification required to obviate the anomaly”, which means that a court will not rewrite a section to cure a defect if the words are simply incapable of bearing the correction. That is why the successful cases turn on a single substituted word rather than on a newly invented proviso.
For anyone who has to argue the point, these four conditions decide how the submission must be built. Each of them has to be pleaded from the Act’s own text, from its scheme and from its legislative history, and not from the way the outcome happens to fall on the client. Padmasundara Rao’s requirement that the reason be found within the four corners of the statute is the same instruction stated the other way round.
How the Supreme Court corrected Section 25(1) of the Consumer Protection Act, 1986
The Supreme Court read the words “an interim order” in Section 25(1) of the Consumer Protection Act, 1986 as though they said “any order”, and it did so in Palm Groves Cooperative Housing Society Ltd. v. M/s Magar Girme and Gaikwad Associates, 2025 INSC 1023, decided on 22 August 2025.
To see why that became necessary, follow what the amendment actually did. Before the Consumer Protection (Amendment) Act, 2002 came into force on 15 March 2003, Section 25 allowed every order to be enforced as if it were a decree. The amendment divided the section into three sub-sections, and sub-section (1) emerged speaking of an “interim order” while sub-section (3) dealt only with orders for money. A final order which was not for money was therefore left with no enforcement provision at all, which pushed successful consumers towards the extraordinary jurisdiction of the High Court under an Act designed to spare them precisely that.
The Court set out three possible cures, chose substitution, and then fixed the reach of what it had done, which is the disciplined part of the exercise. The corrected reading governs the period from 15 March 2003 to 20 July 2020, when the 1986 Act gave way to the Consumer Protection Act, 2019, and it applies to all pending execution petitions at any stage. An order of any court or forum, the judgment observed, “is merely a kind of paper decree unless effective relief is granted to the party entitled thereto”.
Frequently asked questions
Is casus omissus part of the literal rule of interpretation?
It is better understood as the limit of the literal rule than as a part of it. The literal rule directs a court to give the words of a statute their ordinary meaning, whereas casus omissus tells the court what to do in the situation where those words carry no meaning at all for the facts before it. In that situation the gap remains where the legislature left it, unless the narrow exception applies.
Can an Indian court supply a casus omissus?
It can, but only where the necessity is clear and the reason for supplying it is found within the four corners of the statute, which is the test laid down by a Constitution Bench in Padmasundara Rao v. State of Tamil Nadu, (2002) 3 SCC 533. In practice this means the omission has to defeat the object of the Act, or leave other words in the provision with nothing to do. Hardship to a party, standing alone, has never been enough.
What is the difference between a casus omissus and an ambiguity in a statute?
An ambiguity is a provision which carries more than one meaning, and a court resolves it by context, the scheme of the Act and its object. A casus omissus is a provision which carries no meaning for the situation at all. The first is a problem of choosing between available readings and the second is a problem of absence, and only the second attracts the rule of restraint.
Does the casus omissus rule apply differently to taxing and penal statutes?
It applies more strictly in both, because a subject is entitled to know from the words alone what he owes and what will expose him to punishment. Afcons makes the same point from the other direction when it records that purposive interpretation is employed more readily on procedural provisions than on substantive ones.
Which judgment is the leading authority on casus omissus in India?
Padmasundara Rao v. State of Tamil Nadu, (2002) 3 SCC 533, decided by a Constitution Bench of five judges, is the judgment cited for both the rule and its exception. Parson Tools, (1975) 4 SCC 22 remains the classic statement of the refusal to supply an omission, and Afcons, (2010) 8 SCC 24 is the fullest statement of the circumstances in which a court may act.
References
- Padmasundara Rao (Dead) and Ors. v. State of Tamil Nadu and Ors., (2002) 3 SCC 533 (Supreme Court of India, Constitution Bench of five judges, 13 March 2002); AIR 2002 SC 1334.
- The Commissioner of Sales Tax, U.P. v. M/s. Parson Tools and Plants, Kanpur, (1975) 4 SCC 22 (Supreme Court of India, 27 February 1975).
- Shiv Shakti Coop. Housing Society, Nagpur v. M/s. Swaraj Developers and Ors. (Supreme Court of India, 17 April 2003), on Section 115 of the Code of Civil Procedure, 1908.
- S. Surjit Singh Kalra v. Union of India and Anr., (1991) 2 SCC 87 (Supreme Court of India, 13 February 1991), para 19.
- Salem Advocate Bar Association, Tamil Nadu v. Union of India, (2005) 6 SCC 344 (Supreme Court of India, 2 August 2005), para 35, on Order 7 Rule 14(4) of the Code of Civil Procedure, 1908.
- Rajbir Singh Dalal v. Chaudhari Devi Lal University and Anr., (2008) 9 SCC 284 (Supreme Court of India, 6 August 2008), paras 13 to 16.
- Afcons Infrastructure Ltd. and Anr. v. Cherian Varkey Construction Co. (P) Ltd. and Ors., (2010) 8 SCC 24 (Supreme Court of India, 26 July 2010), para 21, on Section 89 of the Code of Civil Procedure, 1908.
- Independent Sugar Corporation Ltd. v. Girish Sriram Juneja, 2025 INSC 124 (Supreme Court of India, 29 January 2025), on the proviso to Section 31(4) of the Insolvency and Bankruptcy Code, 2016.
- Palm Groves Cooperative Housing Society Ltd. v. M/s Magar Girme and Gaikwad Associates, 2025 INSC 1023 (Supreme Court of India, 22 August 2025); signed judgment, paras 18 to 27 and 38.
- Dr Lokesh B.H. and Ors. v. State of Karnataka and Anr., 2026 INSC 784 (Supreme Court of India, 3 August 2026); reported at 2026 LiveLaw (SC) 753.
- Stock v. Frank Jones (Tipton) Ltd., (1978) 1 WLR 231 (House of Lords), as adopted in Justice G.P. Singh, Principles of Statutory Interpretation (12th edn, 2010), p. 144, and set out in Afcons at para 21.6.
- Craies on Statute Law (7th edn), p. 109, as adopted in Surjit Singh Kalra at para 19.
- Maxwell on the Interpretation of Statutes (12th edn), p. 228, “modification of the language to meet the intention”, as set out in Afcons at para 21.1.
This article is for informational and educational purposes only and does not constitute legal advice. Readers should consult a qualified advocate before acting on any statutory provision or judgment discussed above.