Implied Consent in Guaranty Agreements: When Silence and Conduct Affirm Liability

The Supreme Court has long held that a guaranty is not presumed — but that does not mean consent must always be in writing or expressly spoken. In De los Santos v. Vibar (G.R. No. 150931, July 16, 2008), the Court clarified that a person's conduct, including silence and a simple nod, can amount to implied consent to be bound as a guarantor. The case is a useful reminder that in Philippine contract law, actions — and inaction — can speak as loudly as words.

The Facts of the Case

Dr. Cecilia de los Santos and Dr. Priscila Vibar were close friends and former co-workers. In 1994, Cecilia introduced Jose de Leon to Priscila, who lent him P100,000. Cecilia signed as guarantor for that first loan.

In June 1995, de Leon sought another loan of P500,000. During the signing of the second promissory note, Cecilia signed as a witness. But when Priscila's sister, a lawyer, raised the need for Cecilia to sign as guarantor, de Leon handwritten the word "guarantor" beside Cecilia's name. Cecilia nodded her head in approval and did not object.

When de Leon defaulted, Priscila demanded payment from both de Leon and Cecilia. Cecilia paid P15,000 as partial interest but later denied being a guarantor. Priscila sued, and the case eventually reached the Supreme Court.

The Issue: Was There Consent to Be a Guarantor?

The central question was whether Cecilia's conduct — nodding, staying silent, making a partial payment, and writing a letter to the Register of Deeds — constituted consent to be bound as guarantor. Cecilia argued that a guaranty cannot be presumed and that she never expressly agreed.

The Ruling: Conduct Can Prove Consent

The Supreme Court ruled against Cecilia, holding that she was indeed a guarantor. The Court emphasized several key facts:

• The nod of approval. When de Leon inserted the word "guarantor" beside her name, Cecilia nodded. This was a clear sign of assent.
• Silence when one should speak. Cecilia did not object when the word "guarantor" was written in her presence. The Court noted that a positive or negative reaction was expected, and her silence indicated consent.
• Partial payment. Cecilia paid P15,000 as partial compliance with her obligation, which she would not have done if she were merely a witness.
• The letter to the Register of Deeds. Cecilia wrote a letter stating she "appears to be a guarantor," which the Court treated as a written admission.

Written Words Control Printed Words

The Court also applied a basic rule of evidence: when an instrument has both printed and handwritten text that conflict, the handwritten words control. The Court cited the rule under the Rules of Court that written words prevail over printed forms because they are the latest expression of the parties' will. Thus, the handwritten "guarantor" prevailed over the typewritten "witness." The exact section number of this rule is not available in the ASG law library, but the principle was applied directly by the Court in this decision.

Estoppel in Pais

The Court further ruled that Cecilia was estopped from denying her liability. Estoppel in pais prevents a person from taking an inconsistent position when their conduct has led another to rely on it to their detriment. By nodding, paying partially, and admitting her role in writing, Cecilia induced Priscila to believe she was a guarantor. She could not later deny it.

Practical Takeaways

• Consent to a guaranty need not be express. A nod, silence, or conduct that shows approval can be enough.
• Silence can be binding. If a person stays quiet when they should reasonably object, the law may treat that silence as consent.
• Handwritten terms control printed ones. In any contract or instrument, handwritten insertions generally prevail over conflicting printed text.
• Partial payments can be admissions. Making a payment on an obligation can be strong evidence that a person accepted liability.
• Estoppel applies to guarantors. A person who leads others to believe they are a guarantor cannot later deny it to avoid liability.

This article is general information and not legal advice. For your specific situation, consult a lawyer or ask ASG Legal AI.