Currency Exchange Rates in Philippine Contracts: Avoiding Disputes and Ensuring Fair Payment

The Supreme Court's 2011 decision in F.A.T. Kee Computer Systems, Inc. v. Online Networks International, Inc. (G.R. No. 171238) offers practical guidance for businesses that transact in foreign currency. When parties disagree on the exchange rate to apply to a peso payment of a dollar-denominated obligation, courts will look to the parties' conduct — including silence and acceptance of payments — to determine what rate was actually agreed upon. The case also clarifies when estoppel may be invoked against a party who later changes position.

The Facts of the Case

Online Networks International, Inc. (ONLINE) sold computer printers to F.A.T. Kee Computer Systems, Inc. (FAT KEE) in November 1997. The invoices were denominated in US dollars, totaling US$136,149.43. The invoices also stated that interest at 28% per annum would be charged on overdue accounts, plus 25% for attorney's fees in case of suit.

When the obligation fell due in December 1997, the parties negotiated how FAT KEE would pay. ONLINE proposed splitting the payment — half in dollars, half in pesos at P41:US$1. FAT KEE countered with P35:US$1. After further discussions, ONLINE claimed the parties agreed on P40:US$1. FAT KEE, however, insisted no rate was ever finalized.

FAT KEE began making peso payments in March 1998. On March 2, 1998, FAT KEE wrote to ONLINE offering to settle at P37:US$1. ONLINE did not reply, but accepted FAT KEE's subsequent payments without protest. ONLINE later demanded payment of a remaining balance, computed using the P40:US$1 rate. FAT KEE refused, claiming it had fully paid.

The Issue

The central question was: what exchange rate should apply to FAT KEE's dollar-denominated obligation when the parties never signed a written agreement on the conversion rate?

The Ruling

The Supreme Court denied FAT KEE's petition and affirmed the Court of Appeals' decision with modification. The applicable rate was P37:US$1 — the rate FAT KEE offered in its March 2, 1998 letter, which ONLINE implicitly accepted through its silence and acceptance of payments.

The Court reasoned that ONLINE's failure to respond to FAT KEE's offer, followed by its acceptance of payments made at that rate, constituted implied acquiescence. Under the doctrine of estoppel, ONLINE could not later adopt an inconsistent position to FAT KEE's detriment.

The Court also rejected FAT KEE's argument that ONLINE was estopped by an earlier Statement of Account dated December 9, 1997, which used a P34:US$1 rate. Because the parties met on January 15, 1998 — before any payment was made — and actively negotiated new rates, both sides demonstrated they did not intend to be bound by the earlier statement.

The Court computed FAT KEE's remaining obligation at P278,954.73, with 28% interest per annum from July 1998, plus 10% attorney's fees.

Legal Principles on Currency Obligations

Under Republic Act No. 8183, which repealed R.A. No. 529, parties may now agree that obligations be settled in any currency. However, when no agreement exists on the applicable conversion rate, courts apply the prevailing rate at the time of payment. This preserves the real value of the foreign-currency obligation.

The case also illustrates that estoppel — a principle rooted in Article 1431 of the Civil Code — prevents a party from going back on its own acts or representations to the prejudice of another who relied on them. Silence, combined with acceptance of payments, can constitute a binding representation.

Practical Takeaways

• Put currency terms in writing. A signed agreement specifying the currency of payment and the exchange rate mechanism prevents costly disputes.
• Respond to offers promptly. Silence in the face of a counterparty's proposed rate may be treated as acceptance, especially if payments are later received without objection.
• Act on erroneous statements quickly. If a statement of account contains a mistake, correct it immediately and in writing — before the other party relies on it.
• Keep a clear paper trail. Letters, emails, and payment records showing the rate applied can determine the outcome of a dispute.
• Know the default rule. Absent an agreement, foreign-currency obligations may be paid in pesos at the prevailing rate at the time of payment.

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