Unilateral Interest Rate Hikes: Mutuality of Contracts Prevails in Loan Agreements

The Supreme Court has long protected borrowers from unfair lending practices, and a landmark 2004 decision reinforces this protection. In New Sampaguita Builders Construction, Inc. v. Philippine National Bank (G.R. No. 148753), the Court ruled that banks cannot unilaterally increase interest rates, penalties, and other charges without the borrower's knowledge and consent. This ruling affirms the fundamental principle of mutuality of contracts — that both parties must agree to the terms that bind them.

The Case at a Glance

New Sampaguita Builders Construction, Inc. (NSBCI) obtained loans from the Philippine National Bank (PNB) in 1989, secured by real estate mortgages owned by the company's president and his spouse. The promissory notes specified interest rates of 19.5 percent and 21.5 percent per annum. However, each note contained a clause allowing PNB to increase rates "within the limits allowed by law at any time depending on whatever policy it may adopt in the future" — without prior notice to the borrowers.

When NSBCI failed to pay, PNB foreclosed on the properties and sought to collect a deficiency. The borrowers challenged the foreclosure, arguing that PNB had bloated the loan account through unauthorized interest rate hikes, excessive penalties, and unwarranted charges.

The Core Issue: Mutuality of Contracts

The central question was whether PNB could unilaterally impose higher interest rates and penalties without the borrowers' consent. The Supreme Court answered with a resounding no.

Under Article 1308 of the Civil Code, contracts must bind both contracting parties, and their validity cannot be left to the will of one party. The Court emphasized that while escalation clauses in loan agreements are valid for maintaining fiscal stability, giving a lender "unbridled right to adjust the interest independently and upwardly" violates this principle.

The Court stated that the unilateral determination and imposition of increased rates is "violative of the principle of mutuality of contracts." One-sided impositions do not have the force of law between parties because they are not based on the parties' essential equality. The clause that made the fulfillment of the contract dependent exclusively upon the uncontrolled will of PNB was declared void.

The Truth in Lending Act

The Court also gave teeth to the Truth in Lending Act, which requires lenders to fully disclose the true cost of credit to borrowers. In this case, the Disclosure Statements furnished by PNB set forth only the original interest rates — not the increased rates later imposed. Penalty charges and other fees were also absent from these statements.

The Court ruled that excessive interests, penalties, and other charges not revealed in disclosure statements, even if stipulated in promissory notes, cannot be given effect. This protects borrowers from hidden costs and ensures they know exactly what they are agreeing to before signing.

When Can Interest Rates Be Reduced?

The Court clarified that although the Usury Law ceiling on interest rates was lifted by Central Bank Circular No. 905, this does not grant lenders "carte blanche authority to raise interest rates to levels which will either enslave their borrowers or lead to a hemorrhaging of their assets."

Courts retain the power to reduce interest rates that are found to be iniquitous, unconscionable, or exorbitant. In this case, the Court found that interest rates ranging from 26 percent to 35 percent in PNB's statements of account "must be equitably reduced for being iniquitous, unconscionable and exorbitant." Similarly, the penalty rate that PNB unilaterally increased from 6 percent to 36 percent per annum was reduced to zero.

Practical Takeaways

• Banks cannot unilaterally change loan terms. Any increase in interest rates, penalties, or other charges requires the borrower's consent. A clause allowing a lender to adjust rates at its sole discretion is void for violating mutuality of contracts.
• Disclosure statements matter. Under the Truth in Lending Act, charges not disclosed to borrowers before consummation of the loan cannot be collected, even if they appear in the promissory note.
• Courts can reduce unconscionable rates. Even without the Usury Law ceiling, courts may strike down or modify interest rates and penalties that are iniquitous, unconscionable, or exorbitant.
• Borrowers are not bound by silence. Failure to object to a proposed rate increase does not mean consent. There can be no implied waiver without a clear, unequivocal, and decisive act showing such purpose.
• Contracts of adhesion are construed against the lender. Loan agreements prepared by banks are interpreted strictly against the bank, especially when ambiguous.

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