Many Filipinos and foreigners handling loans in the Philippines—whether from family, friends, neighbors, informal “5-6” lenders, or formal institutions—run into the same painful situation: a lender suddenly demands “additional interest,” “tubo,” penalties, or extra charges that were never clearly discussed or written down. The core question is whether a lender can legally impose or collect interest (or additional fees that function as interest) without a written agreement. Under Philippine law the answer is clear on conventional interest, with important nuances for delays and practical enforcement realities that affect ordinary people every day.

The Core Legal Rule on Interest

Article 1956 of the Civil Code of the Philippines states: “No interest shall be due unless it has been expressly stipulated in writing.”

This is one of the most consistently applied rules in Philippine jurisprudence. The Supreme Court has repeatedly held that for a lender to collect conventional or monetary interest on a loan, two things must exist: an express agreement to pay interest and that agreement must appear in writing. A verbal understanding, a handshake, a casual conversation, or even an implied “everyone knows there’s interest” does not satisfy the law.

You can read the full text of Article 1956 of the Civil Code on Chan Robles Virtual Law Library.

The written document can be a simple promissory note, a loan agreement, or even a signed acknowledgment that clearly states the interest rate or amount (for example, “I promise to pay the principal plus interest at 5% per month”). The stipulation must be clear and express—it cannot be left to implication or later interpretation.

What Happens When There Is No Written Agreement on Interest

If there is no written stipulation for interest:

The lender cannot collect conventional interest. Any claim for “tubo,” monthly interest, or add-on interest that was only discussed verbally or assumed is not enforceable.
The principal amount borrowed remains due and demandable. The borrower must still return what was actually received.
Legal interest at 6% per annum can apply as damages if the borrower is in delay (mora). Under Article 2209 of the Civil Code, when an obligation to pay a sum of money is breached and there is no stipulated interest, the indemnity is the legal interest rate of six percent (6%) per annum. This rate has been consistently applied by the Supreme Court in cases involving loans and forbearance of money.

Legal interest begins to run from the date of a valid extrajudicial demand (usually a formal written demand letter) or from the filing of a court case (judicial demand), and it continues until full payment. It is simple interest and does not automatically compound unless the parties expressly agreed to compounding in writing.

In short: no written agreement means no profit interest for the lender on the loan itself, but the law still provides a modest compensatory rate for late payment after proper demand.

“Additional Interest,” Penalties, Surcharges, and Unilateral Charges

Lenders sometimes try to add “additional interest,” daily penalties, restructuring fees, or “service charges” that effectively act as interest, especially after default or when rolling over a loan.

Without an express written stipulation agreed to by both parties, these additional charges are generally not enforceable as conventional interest. Even when a written contract exists, the Supreme Court can—and does—step in when rates or combined penalties become excessive or unconscionable.

For example, in Manila Credit Corporation v. Ramon S. Viroomal and Anita S. Viroomal (G.R. No. 258526, January 11, 2023), the Court nullified stipulated rates of 23.36% per annum plus penalties that produced an effective compounded rate of 36% per annum (three times the then-prevailing legal rate). The Court declared the excessive portions void and reduced the interest and penalties to a reasonable level (12% per annum legal interest in that case), emphasizing that while parties may agree on rates higher than the legal rate, any deviation must remain reasonable and fair. Rates that “enslave the borrower” or hemorrhage assets are contrary to public policy and morals under Article 1409 of the Civil Code.

Unilateral additions made after the original transaction—without a new written agreement or valid amendment—are especially weak in court.

Practical Realities for Ordinary Borrowers and Lenders

In everyday Philippine life, many loans are informal. Family members, friends, or neighborhood lenders often operate on trust and verbal terms. When problems arise, the absence of writing heavily favors the borrower on the interest question. However, proving the existence and amount of the principal loan itself can still be done through other evidence such as bank transfer records, receipts, partial payment acknowledgments, or consistent chat messages showing the debt.

Lending and financing companies licensed by the Securities and Exchange Commission (SEC) face extra layers: they must comply with the Truth in Lending Act (Republic Act No. 3765), which requires clear disclosure of the finance charge, effective interest rate, and total amount payable before the loan is released. They are also subject to SEC rules on fair collection practices and, for certain small unsecured loans, specific interest and fee ceilings. Private individual lenders are governed primarily by the Civil Code but cannot escape general rules against unconscionable dealings.

Foreigners involved in loans in the Philippines are subject to the same rules when the transaction occurs here or Philippine law applies. Documents executed abroad may need apostille authentication for use in Philippine courts, and enforcement across borders adds procedural steps.

Step-by-Step Guide: Handling a Dispute Over Additional Interest

If you are the borrower facing demands for extra interest:

Gather and organize all documents and communications (original notes, bank records, text messages with dates, payment proofs).
Send a calm, written response (preferably via registered mail or email with delivery confirmation). Clearly state that you dispute any interest or additional charges not expressly stipulated in writing, while offering to pay the undisputed principal (and any applicable legal interest from a valid demand date).
If the other party is in the same city or municipality, participate in barangay conciliation proceedings. Many informal disputes are settled here with practical compromises.
If a case is filed against you, especially for smaller amounts, prepare for small claims court (a faster, simplified procedure where lawyers are not required). Bring evidence showing the lack of written interest stipulation.
Document any harassment (excessive calls, public shaming, threats). Such conduct can sometimes give rise to separate legal remedies.

If you are the lender wanting to collect fairly:

From the very beginning, use a clear written promissory note or loan agreement stating the principal, due dates, interest rate (if any), and signatures. Notarization is not mandatory for validity but greatly strengthens your position.
Make any demand in writing and keep proof of receipt.
Avoid aggressive self-help tactics. Illegal collection methods can expose you to counterclaims.
File the appropriate collection case in the correct court and venue.

Typical Dispute Resolution Path in the Philippines

Step	What Usually Happens	Typical Timeline	Practical Notes
Written Demand	Formal letter stating exact amount and legal basis	Days to weeks	Proof of sending/receipt is critical
Barangay Mediation	Mandatory conciliation for most disputes between residents	15–45 days	Often leads to compromise; get Certificate to File Action if no settlement
Court Filing	Small claims (simpler/faster for qualifying amounts) or regular civil case	3–12+ months to decision	Court dockets vary; evidence of written stipulation (or its absence) is key
Judgment & Execution	Court awards principal + legal interest (if proven); enforcement via garnishment or levy	Additional months to years	Settlement is often more practical than prolonged enforcement

Frequently Asked Questions

Can a lender charge interest if we only had a verbal agreement?
No. Article 1956 requires an express written stipulation. Verbal agreements do not allow collection of conventional interest, although the principal remains due.

What interest rate applies if there is a delay but no rate was written in the agreement?
Legal interest of 6% per annum on the principal, counted from a valid written demand or the filing of a court case until full payment. It is simple interest and does not compound automatically.

Can the lender add penalty interest or surcharges without any written agreement?
Generally no. Additional charges functioning as interest or penalties need a written stipulation to be enforceable as conventional terms. Even then, excessive amounts can be reduced by the courts.

Does a text message, Viber chat, or email count as “written” for interest?
Electronic messages can have legal effect under the Electronic Commerce Act (RA 8792) if they clearly show agreement on the interest terms. However, courts prefer formal signed documents for certainty in contested loan cases. Casual chats are often disputed and are safer when followed by a proper promissory note.

If the written document mentions the loan but says nothing about interest, can the lender claim interest later?
No. Silence on interest means no conventional interest was stipulated. The lender can only recover the principal plus 6% legal interest for any proven period of delay after proper demand.

Can courts reduce or cancel interest rates even if they were written in a signed contract?
Yes. The Supreme Court has repeatedly reduced or nullified unconscionable rates and combined penalties (for example, effective rates of 36% per annum or higher) when they are excessive relative to the legal rate and circumstances. Reasonableness and fairness remain the standard.

What should I do if an informal lender keeps demanding “additional interest” that was never written?
Respond in writing disputing the interest claim while offering to settle the principal. Attend barangay proceedings if called. Keep detailed records of all communications. If harassment escalates, document it and consider seeking legal assistance for possible separate remedies.

Do banks, lending companies, and online lending apps follow the same rules?
They must follow the Civil Code rules on written interest stipulations plus additional requirements under the Truth in Lending Act and SEC regulations, including proper disclosures and fair collection practices. Courts can still intervene on unconscionable terms.

If I am a foreigner lending or borrowing in the Philippines, do these rules apply?
Yes. Philippine law on loans and interest generally applies to transactions here. Foreign-executed documents may require apostille for court use, and cross-border enforcement involves extra procedural steps.

How can I properly document a loan to avoid future disputes about interest?
Use a signed promissory note or simple loan agreement that clearly states the parties, principal amount, due date or schedule, interest rate (if any), and any penalties. Notarize it for stronger evidentiary value. Keep copies of everything and issue official receipts for all payments.

Key Takeaways

Conventional interest on a loan requires an express written stipulation under Article 1956 of the Civil Code. Without it, the lender cannot collect that interest.
Legal interest of 6% per annum can still apply as damages for delay after a proper demand, but it is limited and does not automatically compound.
“Additional interest,” penalties, or unilateral charges without written agreement are generally unenforceable and can be successfully challenged.
Even written interest terms are not unlimited—courts can equitably reduce excessive or unconscionable rates and penalties.
Both borrowers and lenders protect themselves best by using a clear, signed (preferably notarized) written document from the start.
In real disputes, written records, proper demands, and barangay mediation often lead to faster and more practical resolutions than full court litigation.
The law aims to balance protection for borrowers against surprise claims with fair recovery for legitimate lenders who document their agreements properly.