Question:

X takes a loan of 10,00,000 from Bank A. Y signs a contract as surety... Bank A agrees to reduce the interest rate and extends the repayment period by 6 months without informing Y... Which of the following statements correctly describes Y's liability under the Indian Contract Act, 1872?

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Remember: Section 133 = Variance without Surety's Consent = Discharge of Surety. Whenever the creditor changes the original contract without informing the surety, think of Section 133 immediately.
Updated On: Jul 13, 2026
  • Y is liable only if the bank sues the principal debtor first...
  • Y is not liable at all because the principal debtor defaulted after the contract modification.
  • Y is partially discharged from liability because Bank A's modification increased the risk to Y without his consent.
  • Y is fully liable for the entire loan because a surety is always liable once the principal debtor defaults.
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The Correct Option is C

Approach Solution - 1

Concept: A contract of guarantee creates a tripartite relationship between the creditor, principal debtor, and surety. Since the surety undertakes liability based on the original terms of the contract, the law protects the surety from unauthorized changes made by the creditor and principal debtor.

Step 1: Relevant legal provision.

• Section 133 of the Indian Contract Act, 1872 provides that any variance made in the terms of the contract between the creditor and principal debtor without the surety's consent discharges the surety as to transactions subsequent to the variance.

Step 2: Applying the facts.

• Bank A reduced the rate of interest.

• Bank A extended the repayment period by six months.

• These changes altered the original contract.

• Y, the surety, was not informed and did not consent to the modifications.

Step 3: Effect on surety's liability.

• The surety agreed to guarantee the debt under the original terms.

• Once those terms were changed without his consent, the law protects him from the consequences of the altered arrangement.

• Therefore, Y stands discharged to the extent contemplated by Section 133.

Step 4: Final conclusion.

• Y cannot be held bound by modifications made behind his back.

• Hence the most appropriate option is that Y is discharged because the contract was varied without his consent.

A surety cannot be bound by material changes made in the principal contract without his consent. \[ \boxed{\text{Correct Answer = (C)}} \]
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Approach Solution -2

A surety's obligation is strictly bound by the terms he actually agreed to, since a guarantee is a promise given on the faith of one particular set of facts about the principal debtor's obligation. Testing each option against this rule against unilateral rewriting of the surety's bargain, rather than jumping straight to a section number, gives a reliable way to find the right answer.

  1. Y is liable only if the bank sues the principal debtor first: Indian law does not require a creditor to exhaust remedies against the principal debtor before proceeding against the surety; the surety's liability is normally co-extensive with, and immediate alongside, that of the principal debtor, not conditional on the creditor suing X first. This option misstates the basic nature of a guarantee and is incorrect.
  2. Y is not liable at all because the principal debtor defaulted after the contract modification: A default by the principal debtor, by itself, does not wipe out a surety's obligation entirely. What matters is not the mere fact of default but whether the underlying contract terms were changed without Y's knowledge or consent. Since some liability can survive for transactions before the variance, saying Y bears no liability whatsoever goes too far.
  3. Y is partially discharged from liability because Bank A's modification increased the risk to Y without his consent: A guarantee is given on the basis of a specific bargain between the creditor and the principal debtor. When the creditor and debtor later change that bargain, here by lowering the interest rate and extending the repayment period, without asking the surety, they alter the very risk the surety agreed to underwrite, without his agreement. Since Y never consented to carry this altered risk, fairness and the settled principle of suretyship require that he be relieved from liability to the extent of that unauthorised variance, that is, partially discharged, rather than wiped out entirely or left fully bound.
  4. Y is fully liable for the entire loan because a surety is always liable once the principal debtor defaults: This treats a surety's liability as absolute and unconditional, ignoring that a guarantee is a contract whose terms the surety is entitled to rely upon. Since the creditor changed those terms without Y's consent, treating Y as fully bound regardless of that change contradicts the very idea that a surety's promise is tied to a specific, unaltered bargain.

Because Bank A and X changed the interest rate and repayment period between themselves without informing or obtaining Y's consent, the risk Y actually agreed to bear was altered unilaterally, and the law responds by discharging Y only to the extent of that alteration, not entirely and not leaving him fully bound either.

So the correct answer is Y is partially discharged from liability because Bank A's modification increased the risk to Y without his consent.

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