Fundamentals of Business Laws and Business Communication · Contingent Contracts

Contracts Contingent on an Event Not Happening (Section 33)

Updated 10 October 2026 · Fact-checked

A contract under Section 33 is a contingent contract to be performed only if an uncertain future event does not happen. It cannot be enforced while the event is still possible. It becomes enforceable once the happening of that event becomes impossible. To solve questions, find the event, then check whether it can still happen.

Understand Contracts Contingent on an Event Not Happening (Section 33)

A contingent contract is a contract to do or not to do something if some event, collateral to the contract, does or does not happen. The contract depends on that event, and the event is not part of the main promise itself. Section 31 gives this meaning. The event is usually uncertain, and that is an accepted feature of such events, but uncertainty is not the statutory wording of the definition.

Section 33 deals with one type: the contract depends on an event not happening. Example: Ravi promises to pay Meena ₹50,000 if a certain ship does not return to Mumbai. Payment is due only if the ship fails to return. The event is the ship's return, and the contract depends on that event not happening.

The key question is: when can Meena enforce it? Not while the ship could still return. Only when the ship's return becomes impossible, for example because the ship has sunk. At that point the condition is fulfilled and the contract can be enforced.

So the section works like a waiting rule. While the event may still happen, the contract stays on hold. Once the event can no longer happen, the promise becomes due.

Compare Section 32. There the contract depends on an event happening. It cannot be enforced until that event has happened. If the event becomes impossible, the contract becomes void. In Section 33, impossibility of the event is what makes the contract enforceable.

Key formulas to remember

Section 33 rule: Contract to be performed if an uncertain event does not happen → enforceable when the happening of that event becomes impossible; Not enforceable while the event is still possible.
Section 32 rule (for contrast): Contract to be performed if an uncertain event happens → enforceable only after the event happens; void if the event becomes impossible; Section 32 is about the event happening; Section 33 is about the event not happening.
Meaning of contingent contract (Section 31): Contract to do or not to do something if an event, collateral to the contract, does or does not happen; The event is collateral, meaning not the main promise itself, and the contract depends on it. Uncertainty is an accepted feature of the event, not statutory wording.

How to solve Contracts Contingent on an Event Not Happening (Section 33) questions

Use this method for any Section 33 question, whether it is theory or a short case.

1Read the facts and find the promise: who must do what, and on what condition.
2Find the uncertain event that the promise depends on.
3Check the wording: is performance due if the event does NOT happen? If yes, Section 33 applies.
4Ask whether the event is still possible or has become impossible (for example, the ship has sunk, the goods are destroyed, or the person has died).
5If the event is still possible, the contract cannot yet be enforced.
6If the event has become impossible, the contract can now be enforced.
7If the facts say the event happened, a Section 33 contract is not triggered; note the contrast with Section 32 if relevant.

Quickest way: Not-happening = wait for impossibility

When to use it: Use this for MCQs that give a short fact situation and ask when the contract can be enforced.

Underline the word 'not' in the condition. If performance is due when something does NOT happen, think Section 33.
Look for words like 'sunk', 'destroyed', 'ceased', 'no longer possible'. These show the event has become impossible.
Pick the option saying the contract becomes enforceable when the event becomes impossible.
Eliminate options that say enforceable at once, or void, unless the facts clearly point there.

Common mistakes in Contracts Contingent on an Event Not Happening (Section 33)

Mixing up Section 32 and Section 33.
Both deal with contingent contracts and the numbers are close.
Fix: Remember: 32 = event happens; 33 = event does not happen. Check the condition wording first.
Saying the contract is void when the event becomes impossible.
Students carry over the Section 32 rule.
Fix: Under Section 33, impossibility of the event makes the contract enforceable, not void.
Saying the contract is enforceable from the start.
Students forget that the contract waits while the event is still possible.
Fix: State that enforcement comes only when the event becomes impossible.
Treating a contingent contract as a wagering agreement.
Both depend on an uncertain outcome, so students think a contingent contract is just a bet.
Fix: A contingent contract depends on an event collateral to the contract, and the parties do not merely stake money on the outcome. A wagering agreement is different and is void. Check whether the event is collateral to a real promise.
Treating the contingent event as the main promise.
Students overlook the word 'collateral'.
Fix: The event sits outside the main promise. Identify the promise and the event separately.

Worked examples

Example 1

A promises to pay B ₹1,00,000 if a certain cargo ship does not return to Chennai port. The ship sinks at sea. Can B enforce the contract?

Show the solution

The promise is A's payment of ₹1,00,000 to B.
The uncertain event is the return of the ship. Payment is due if the ship does NOT return, so Section 33 applies.
Sinking of the ship makes its return impossible.
Once the event becomes impossible, the contract can be enforced.

Answer: Yes. B can enforce the contract once the ship's return became impossible by its sinking.

Example 2

An insurer-like promise: X agrees to pay Y ₹20,000 if a consignment of goods does not arrive by sea at Kochi port. While the consignment is still on its way, can Y enforce the contract? Later the ship carrying it is lost at sea. When can Y enforce the contract?

Show the solution

The promise is X's payment of ₹20,000 to Y.
The event is the arrival of the consignment by sea. Payment is due if it does NOT arrive, so Section 33 applies.
While the consignment is still on its way, it can still arrive, so the event is possible and Y cannot enforce yet.
When the ship is lost at sea, arrival becomes impossible, so the condition is fulfilled.

Answer: Y cannot enforce while arrival is still possible. Y can enforce once the consignment's arrival becomes impossible, that is, when the ship is lost.

Exam tips

Look at the condition wording. 'Does not happen' signals Section 33.
Learn the pair: Section 32 void on impossibility, Section 33 enforceable on impossibility.
For MCQs, the correct option usually uses the phrase 'happening of that event becomes impossible'.
In case-style questions, state the event, say whether it is still possible, then give the conclusion.
Revise Sections 31 to 36 together, since options often borrow wording from neighbouring sections.

Practice questions from Contingent Contracts

Contracts Contingent on an Event Not Happening (Section 33) in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

CS ProfessionalEnforcement of Contingent Contracts (Sections 32, 33 and 35)

Contracts Contingent on an Event Not Happening (Section 33): frequently asked questions

What does Section 33 of the Indian Contract Act say?

It covers contracts to be performed if an uncertain future event does not happen. Such a contract can be enforced when the happening of that event becomes impossible, and not before.

What is the difference between Section 32 and Section 33?

Section 32 deals with contracts depending on an event happening, enforceable only after it happens, and void if it becomes impossible. Section 33 deals with contracts depending on an event not happening, enforceable once its happening becomes impossible.

Is a contract under Section 33 valid?

Yes. It is a valid contingent contract. Only the time at which it can be enforced depends on the event becoming impossible.

How do I answer a Section 33 question in the exam?

Find the promise and the event. Check that performance is due if the event does not happen. Then say whether the event is still possible or has become impossible, and state the result.