Section 135 in The Indian Contract Act, 1872

Title: Discharge of surety when creditor compounds with, gives time to, or agrees not to sue, principal debtor.

Description: A contract between the creditor and the principal debtor, by which the creditor makes a composition with, or promises to give time to, or not to sue, the principal debtor, discharges the surety, unless the surety assents to such contract.

Title: Surety not discharged when agreement made with third person to give time to principal debtor.

Description: Where a contract to give time to the principal debtor is made by the creditor with a third person, and not with the principal debtor, the surety is not discharged. Illustration C, the holder of an overdue bill of exchange drawn by A as surety for B, and accepted by B, contracts with M to give time to B. A is not discharged.

Title: Creditor's forbearance to sue does not discharge surety.

Description: Mere forbearance on the part of the creditor to sue the principal debtor or to enforce any other remedy against him does not, in the absence of any provision in the guarantee to the contrary, discharge the surety. Illustration B owes to C a debt guaranteed by A. The debt becomes payable. C does not sue B for a year after the debt has become payable. A is not discharged from his suretyship.

Title: Release of one co-surety does not discharge others.  

Description: Where there are co-sureties, a release by the creditor of one of them does not discharge the others; neither does it free the surety so released from his responsibility to the other sureties1. 1. See s. 44, supra.

Title: Discharge of surety of creditor's act or omission impairing surety's eventual remedy.

Description: If the creditor does any act which is inconsistent with the rights of the surety, or omits to do any act which his duty to the surety requires him to do, and the eventual remedy of the surety himself against the principal debtor is thereby impaired, the surety is discharged. Illustrations (a) B contracts to build a ship for C for a given sum, to be paid by instalments as the work reaches certain stages. A becomes surety to C for B's due performance of the contract. C, without the knowledge of A, prepays to B the last two instalments. A is discharged by this prepayment. (b) C lends money to B on the security of a joint and several promissory note made in C's favour by B, and by A as surety for B, together with a bill of sale of B's furniture, which gives power to C to sell the furniture, and apply the proceeds in discharge of the note. Subsequently, C sells the furniture, but, owing to his misconduct and wilful negligence, only a small price is realized. A is discharged from liability on the note. (c) A puts M as apprentice to B, and gives a guarantee to B for M's fidelity. B promises on his part that he will, at least once a month, see M make up the cash. B omits to see this done as promised, and M embezzles. A is not liable to B on his guarantee.