Krishan and Som enter into a contract for the sale of a house under construction. Som promises to Krishan that the house would be handed over by 07.01.2013 at a price of Rs. 20,00,000/-. The agreement to sell is duly registered. Subsequently, Krishan enters into a contract with Ramesh wherein Ramesh agrees to buy the same house paying 20% extra on the contract price between Krishan and Som. On 09.11.2012, Ramesh comes to know that Krishan and Som have reached a verbal understanding that due to a slide in the market, Krishan will now pay Rs. 15,00,000/-. (i) Decide if the subsequent verbal agreement between Krishan and Som can be proved in a suit between them. (ii) Decide if the subsequent verbal agreement between Krishan and Som can be proved in a suit between Ramesh and Krishan.

The Facts, Mapped to the Legal Framework

The transaction has three layers. First, Som agrees to sell a house under construction to Krishan for Rs. 20,00,000/-, with possession to be handed over by 07.01.2013 — and this agreement to sell is duly registered. Second, Krishan enters into a separate contract with Ramesh, wherein Ramesh agrees to buy the same house at 20% over the Krishan-Som contract price. Third, on 09.11.2012, a subsequent verbal understanding is reached between Krishan and Som that, in view of a slide in the real estate market, the price will now be reduced to Rs. 15,00,000/-.

Two questions arise from this factual matrix, and they must be answered by reference to entirely different rules of law.

Question (i): Can the Subsequent Verbal Agreement Be Proved in a Suit Between Krishan and Som?

The Governing Provision

This question is directly and decisively answered by the fourth proviso to Section 92 of the Indian Evidence Act, 1872 — now reproduced as the corresponding proviso to Section 95 of the Bharatiya Sakshya Adhiniyam, 2023. The main rule in Section 92 is that once a document has been proved under Section 91, no oral agreement shall be admitted as between the parties to the instrument or their representatives in interest, for the purpose of contradicting, varying, adding to, or subtracting from its terms. The fourth proviso creates a limited exception — it permits proof of a subsequent oral agreement to rescind or modify a contract. However, this proviso immediately qualifies itself with a crucial restriction:

"...except in cases in which such contract, grant or disposition of property is required by law to be in writing, or has been registered according to the law in force for the time being as to the registration of documents."

Application to the Facts

The agreement to sell between Krishan and Som has been duly registered. Registration imparts a degree of legal formality to the transaction that places it beyond the reach of subsequent oral modification. The law takes the position that a party who has gone to the trouble of executing and registering a document has thereby expressed a clear intention that the transaction shall be governed by the formal written record — and cannot then escape that formality by the convenient device of an oral understanding.

The principle was articulated with clarity by the Supreme Court in S. Saktivel v. M. Venugopal Pillai (AIR 2000 SC 2633 / 2000 7 SCC 104): a disposition conferring title to property is required by law to be reduced to writing in order to ensure its efficacy and effectiveness. The parties to such a document cannot, under proviso 4 to Section 92, be permitted to adduce oral evidence to prove a subsequent agreement which has the result of modifying the written document, especially when the document has been registered. Similarly, in a long line of decisions including Raval Co. v. K.G. Ramachandran (AIR 1974 SC 818 / 1974 1 SCC 424), it was held that variation of rent fixed by a registered lease deed must be made by another registered instrument — a subsequent oral arrangement to vary it simply does not hold. The Bombay and the Lahore High Courts have consistently held that a subsequent agreement to accept less than is due under a registered deed is an agreement modifying the terms of a written contract, and oral evidence is inadmissible in proof of it.

The Distinction Between Modification and Satisfaction

There is, however, one qualification that deserves honest acknowledgment, because it has been the subject of considerable judicial debate. Courts have distinguished between two situations that, on the surface, look similar:

• Proving that the parties orally agreed to modify the price — to accept Rs. 15,00,000/- instead of Rs. 20,00,000/-.

• Proving that the creditor actually accepted Rs. 15,00,000/- in full satisfaction of the debt.

A Full Bench of the Allahabad High Court in Collector of Etah v. Kishori Lal (1930 53 All 157 FB) held that an agreement between parties to a mortgage deed cannot be proved by oral evidence to show that on payment of a lesser sum the debt would be discharged — that would be modifying the contract. But evidence of actual payment and acceptance in full satisfaction may be permitted, not as evidence of a new agreement varying the deed, but as evidence of the discharge of an obligation under it. The Bombay High Court in Sukhlal v. Jetha (1928 30 Bom LR 1455) put it memorably: a debtor cannot prove that his creditor agreed verbally to take less, but he can prove that the creditor actually did accept less in full satisfaction.

In the present case, however, the verbal understanding as stated is one of future agreement — Krishan will now pay Rs. 15,00,000/-. This is not actual past satisfaction. It is a prospective modification of the price, which falls squarely within the prohibition. As between Krishan and Som, the verbal agreement that the price would be reduced cannot be proved. The registered agreement for Rs. 20,00,000/- stands, and any variation of it must be effected by a fresh instrument of equivalent formality.

Can a New Oral Contract Substitute the Registered One?

One further legal argument must be addressed. The fourth proviso speaks of rescission or modification. The law is clear — and the Supreme Court affirmed this in multiple decisions — that the proviso does not permit a subsequent oral agreement to substitute a new contract by novation when the original contract was required to be in writing or has been registered. Novation, where the old contract is extinguished and a new one takes its place, would require the same degree of formality as the original. An oral substituted agreement is, in this context, as ineffective as an oral modification.

Answer to Question (i): The subsequent verbal agreement between Krishan and Som that the price would be reduced to Rs. 15,00,000/- cannot be proved in a suit between them. The fourth proviso to Section 92 of the Evidence Act (Section 95 BSA) expressly excludes proof of any subsequent oral agreement to rescind or modify a registered instrument.

Question (ii): Can the Verbal Agreement Be Proved in a Suit Between Ramesh and Krishan?

A Completely Different Rule Operates

The analysis changes entirely when the suit is between Ramesh and Krishan. Ramesh is not a party to the Krishan-Som agreement — he is a stranger to that document. The rule of exclusion in Section 92 of the Evidence Act is, by its express terms, a rule that operates only as between the parties to the instrument or their representatives in interest. Ramesh is neither.

This position is enshrined in Section 99 of the Indian Evidence Act (Section 102 of the BSA), which provides:

"Persons who are not parties to a document, or their representatives in interest, may give evidence of any facts tending to show a contemporaneous agreement varying the terms of the document."

The Rationale

The exclusionary rule of Section 92 is built upon the doctrine of mutuality. Parties who together executed a written instrument are taken to have made that writing the final and conclusive record of their agreement — they cannot resile from it before each other. But a stranger to the document is not bound by that mutual compact. A stranger never agreed to be governed by the writing. His rights and liabilities must be determined by the full truth of the situation, including oral agreements that may affect his interests — and the law does not shut his mouth.

The Supreme Court examined the relationship between Section 92 and Section 99 with precision in Bai Hira Devi v. Official Assignee of Bombay (AIR 1958 SC 448), per Justice Gajendragadkar. The Court observed that the true position is that if the terms of any transfer reduced to writing are in dispute between a stranger to a document and a party to it or his representative in interest, the restriction imposed by Section 92 in regard to the exclusion of evidence of oral agreement is inapplicable — and both the stranger to the document and the party to the document are at liberty to lead evidence of oral agreement, notwithstanding the fact that such evidence, if believed, may contradict, vary, add to or subtract from its terms. The rule of exclusion enunciated by Section 92 applies to both parties to the document and is based on the doctrine of mutuality. Remove one party from that mutual compact — as when a stranger is involved — and the foundation of the exclusionary rule disappears.

Application to the Facts

Ramesh's contract with Krishan is pegged to the price in the Krishan-Som agreement — he agreed to pay 20% extra on that contract price of Rs. 20,00,000/-, making his price Rs. 24,00,000/-. If the Krishan-Som price has in fact been reduced by oral understanding to Rs. 15,00,000/-, Ramesh's price would also fall — to Rs. 18,00,000/- — a difference of Rs. 6,00,000/-. This verbal agreement between Krishan and Som directly and materially affects Ramesh's interests. Ramesh, as a stranger to the Krishan-Som registered agreement, is entitled under Section 99 of the Evidence Act (Section 102 BSA) to prove the subsequent verbal understanding that the price was reduced.

Importantly — and the Supreme Court made this explicit in Bai Hira Devi — Section 99 does not merely permit strangers to prove such agreements; it also has the effect, in a suit involving a stranger, of removing the bar of Section 92 from the party to the document as well. Krishan, in a suit against Ramesh, would equally be able to produce evidence of the oral understanding — because the entire basis for the Section 92 exclusion is the mutuality between contracting parties, and that mutuality is absent when a stranger is before the court.

The Illustration to Section 99

The illustration to Section 99 of the Evidence Act makes the point with admirable directness: A and B make a contract in writing that B shall sell A certain cotton, to be paid for on delivery. At the same time they make an oral agreement that three months credit shall be given to A. This could not be shown as between A and B, but it might be shown by C, if it affected his interests. The Krishan-Ramesh-Som scenario is a near-perfect parallel of this statutory illustration, with the added dimension that the oral agreement is subsequent rather than contemporaneous — and the proviso in Section 99 speaks of "contemporaneous agreement" in the illustration though the principle has been applied more broadly to subsequent agreements as well when they affect a stranger's interests.

Answer to Question (ii): The subsequent verbal agreement between Krishan and Som can be proved in a suit between Ramesh and Krishan. Ramesh is a stranger to the Krishan-Som registered agreement. By virtue of Section 99 of the Evidence Act (Section 102 of the BSA), persons who are not parties to a document may give evidence of facts tending to show a contemporaneous or subsequent agreement varying its terms, provided that agreement affects their interests. The bar of Section 92 operates only as between the parties to the document and does not bind strangers.

The Governing Principle — Summarised

The scheme of the law that these two questions reveal reflects a considered policy choice. Between the parties themselves, the sanctity of registered documents must be preserved absolutely — otherwise, parties could escape the legal consequences of formal documents by convenient oral recollections of subsequent conversations, and the entire system of registration would be rendered meaningless. But between a stranger and a party to the document, justice requires that the stranger not be bound by — or deprived of the benefit of — facts he had no opportunity to record in writing. The law accordingly holds the parties firmly to their formal instrument as between themselves, while permitting the full truth to emerge before a court when a stranger's rights are in issue.