Section 4 of Indian Contract Act

Communication when complete.— The communication of a proposal is complete when it comes to the knowledge of the person to whom it is made.

The communication of an acceptance is complete,—

  • as against the proposer, when it is put in a course of transmission to him, so as to be out of the power of the acceptor;
  • as against the acceptor, when it comes to the knowledge of the proposer.

The communication of a revocation is complete,—

  • as against the person who makes it, when it is put into a course of transmission to the person to whom it is made, so as to be out of the power of the person who makes it;
  • as against the person to whom it is made, when it comes to his knowledge.

Illustrations

(a) A proposes, by letter, to sell a house to B at a certain price.
The communication of the proposal is complete when B receives the letter.

(b) B accepts A’s proposal by a letter sent by post.
The communication of the acceptance is complete,

  • as against A when the letter is posted;
  • as against B, when the letter is received by A.

(c) A revokes his proposal by telegram.

  • The revocation is complete as against A when the telegram is despatched. It is complete as against B when B receives it.
  • B revokes his acceptance by telegram. B’s revocation is complete as against B when the telegram is despatched, and as against A when it reaches him.