Spouses Vicky Tan Toh v. Solid Bank Corporation

Summary

The Supreme Court ruled that petitioner-spouses, who executed a Continuing Guaranty as sureties for their corporation's banking facility, were discharged from liability due to the bank's unauthorized extensions of letters of credit without compliance with required marginal deposits and partial payments. While the Court acknowledged the validity of the guaranty contract, it applied Civil Code provisions on suretyship, particularly Articles 2079 and 2080, finding that extensions granted without surety consent and the bank's failure to safeguard additional securities constituted material alterations that extinguished the guaranty. The decision emphasizes that surety contracts must be strictly construed, and accommodation sureties are protected against creditor actions that materially alter the principal obligation. The case demonstrates the intersection of banking law and civil law principles governing suretyship, establishing important precedent for the discharge of sureties when creditors fail to comply with agreed security requirements during debt extensions.