Acknowledgment of Debt and the Best Evidence Rule: BPI v. Mendoza

The Supreme Court's 2017 decision in Bank of the Philippine Islands v. Mendoza¹ is a practical reminder that a party's own voluntary acts can be the strongest evidence of an obligation. The case also clarifies the limits of the Best Evidence Rule, showing that a photocopy of a document may be admitted when the original cannot be produced for a valid reason. For banks, creditors, and ordinary parties to contracts, the ruling underscores how acknowledgments and promissory notes can establish liability even when documentary proof is imperfect.

The Facts of the Case

In April 1997, respondents Amado Mendoza and his mother, Maria Marcos Vda. de Mendoza, opened a foreign currency savings account with the Bank of the Philippine Islands (BPI) and deposited US$16,264.00, consisting of cash and a US Treasury Check payable to Maria. They later withdrew most of the funds after the clearing period.

Two months later, BPI received notice from its correspondent bank, Bankers Trust Company New York, that the check was dishonored because the amount had been altered. BPI demanded reimbursement. The respondents allowed BPI to apply the proceeds of their time deposit to the obligation, and Amado executed a promissory note dated September 8, 1997, promising to pay P1,000.00 monthly until the balance was settled.

When the respondents failed to pay, BPI sued for sum of money. The trial court ruled in favor of BPI, but the Court of Appeals reversed, holding that BPI failed to prove the check's dishonor because it presented only a photocopy of the check and an unauthenticated e-mail advice.

The Issue

The central question was whether the Court of Appeals correctly dismissed BPI's complaint. This required the Court to determine whether BPI had proven its claim by preponderance of evidence, and whether the photocopy of the check was admissible despite the Best Evidence Rule.

The Ruling: Acknowledgment as Proof of Obligation

The Supreme Court sided with BPI, reinstating the trial court's decision with a modification on the interest rate.

Preponderance of evidence. The Court explained that in civil cases, the plaintiff must prove its claim by preponderance of evidence—the greater weight of credible evidence. Here, BPI's evidence was strong: Amado had voluntarily signed letters acknowledging the dishonor and consenting to the application of the time deposit proceeds, and he executed a promissory note promising to pay the remaining balance.

Amado's claim that he signed these documents merely to acknowledge receipt, without consenting to the obligation, was rejected. The Court found his testimony self-serving and uncorroborated, noting that trial courts are in the best position to assess witness credibility.

The Best Evidence Rule and Its Exceptions

The Court also corrected the Court of Appeals' application of the Best Evidence Rule. Under Section 3, Rule 130 of the Rules of Court, the original document must generally be presented when its contents are in question. However, the rule admits exceptions, including when the original has been lost or destroyed, or cannot be produced in court, without bad faith on the part of the offeror.

To avail of this exception, the offeror must prove: (1) the existence or due execution of the original; (2) the loss, destruction, or reason for non-production; and (3) the absence of bad faith.

BPI satisfied all three requirements. The check's existence was admitted by both parties. The original could not be produced because it was confiscated by the US government as an altered instrument. And there was no evidence of bad faith on BPI's part. The photocopy was therefore admissible as secondary evidence.

As for the e-mail advice, the Court noted that even if it was not properly authenticated under the Rules on Electronic Evidence, it was merely corroborative. Its exclusion did not diminish the probative value of the other evidence—particularly Amado's own written acknowledgments and the promissory note.

The Interest Rate: Solutio Indebiti, Not a Loan

The Court modified the interest rate imposed by the trial court. Because BPI's payment to the respondents was made by mistake—the check had not actually cleared—the obligation arose from solutio indebiti under Article 2154 of the Civil Code, not from a loan or forbearance of money. Accordingly, the applicable interest was six percent (6%) per annum, computed from the date of extrajudicial demand on June 27, 1997, until fully paid, rather than the 12% rate for loans.

Practical Takeaways

• Written acknowledgments matter. Signing a letter or promissory note acknowledging an obligation can be decisive evidence in court, even if the underlying transaction is disputed.
• The Best Evidence Rule has exceptions. A photocopy may be admitted when the original is lost, destroyed, or cannot be produced without bad faith, provided the offeror proves the original's existence and the reason for its non-production.
• Unobjected evidence is deemed admitted. Failure to object to evidence at trial means it may be considered by the court.
• Interest rates depend on the nature of the obligation. Payments made by mistake give rise to solutio indebiti, which carries 6% interest per annum, not the higher rate for loans.
• Self-serving testimony is weak. A party's uncorroborated claims are unlikely to overcome documentary evidence or the opposing party's own written acts.

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

Footnotes

1. Bank of the Philippine Islands v. Mendoza, G.R. No. 198799, March 20, 2017, 807 Phil. 640. ↩