I. Introduction

A common question in loan disputes is whether a borrower may legally insist on paying only the principal amount of a loan and refuse to pay interest, penalties, attorney’s fees, collection charges, or other additions. In the Philippine context, the answer depends on the agreement of the parties, the validity of the interest or charges imposed, the presence of written stipulations, the nature of the loan, and the equitable power of courts to reduce unconscionable charges.

As a general rule, a borrower must pay what was validly agreed upon. If the loan contract validly provides for interest, penalties, and other charges, the borrower cannot simply choose to pay only the principal. However, Philippine law also protects borrowers from interest and charges that are not agreed upon in writing, are contrary to law, or are excessive, unconscionable, or iniquitous.

Thus, the better legal formulation is this: a borrower may pay only the principal when the creditor has no valid legal basis to collect interest or additional charges, or when such charges are invalid, excessive, or judicially reduced; but where interest and charges are validly stipulated, the borrower generally cannot discharge the obligation by paying principal alone.

II. Nature of a Loan Under Philippine Law

A loan is generally governed by the Civil Code of the Philippines. In a simple loan or mutuum, one party delivers money or another consumable thing to another, and the borrower acquires ownership of it, with the obligation to pay the creditor the same amount or the same kind and quality.

In money loans, the borrower’s primary obligation is to return the amount borrowed. This amount is called the principal.

However, a loan may also carry:

Monetary interest — compensation for the use of money;
Default or compensatory interest — damages for delay in payment;
Penalty charges — amounts imposed for breach or late payment;
Attorney’s fees — if validly stipulated or awarded by the court;
Collection costs — if agreed upon and reasonable;
Other charges — such as service fees, processing fees, or finance charges, subject to applicable law and regulation.

The legal issue is whether these additions are enforceable.

III. Principal Versus Interest

The principal is the original amount borrowed.

Interest is an accessory obligation. It does not automatically arise from every loan. Under Philippine law, interest is not presumed merely because money was lent. The creditor must have a legal or contractual basis to collect it.

The Civil Code provides that no interest shall be due unless it has been expressly stipulated in writing. This is one of the most important rules in Philippine loan law.

Therefore, if a person borrows ₱100,000 and there is no written agreement that the loan bears interest, the creditor generally cannot demand interest as compensation for the use of the money. The borrower may be liable only for the ₱100,000 principal, subject to possible legal interest as damages if the borrower later incurs delay and proper demand is made.

IV. When the Borrower May Pay Only the Principal

A borrower may validly insist on paying only the principal in several situations.

A. When There Is No Written Stipulation on Interest

The clearest case is where the loan agreement does not contain a written stipulation on interest.

Philippine law requires interest to be expressly agreed upon in writing. Oral agreements to pay interest are generally unenforceable as interest stipulations. The borrower may still owe the principal, but the creditor cannot ordinarily compel payment of conventional interest based only on verbal understanding.

Example:

A borrowed ₱50,000 from B. They verbally agreed that A would pay 5% monthly interest, but there is no written document, text message, promissory note, or written acknowledgment showing the interest agreement. B may collect the ₱50,000 principal, but B may have difficulty enforcing the 5% monthly interest.

The law’s purpose is to protect borrowers from fabricated, unclear, or oppressive claims of interest.

B. When the Contract Says the Loan Is Interest-Free

If the written agreement states that the loan is payable without interest, the creditor cannot later demand interest as compensation for the use of the money.

The borrower may pay only the principal, unless the borrower goes into delay and becomes liable for legal interest as damages.

C. When the Claimed Interest Was Not Agreed Upon

A creditor cannot unilaterally impose interest after the loan has been released. Interest requires consent. If the borrower agreed only to borrow ₱100,000 payable in six months, the lender cannot later say that the borrower must pay 10% monthly interest unless the borrower agreed to it in writing.

D. When Interest Is Unconscionable or Iniquitous

Even when interest is in writing, Philippine courts may reduce interest that is excessive, unconscionable, or contrary to morals and public policy.

The Philippines no longer has a fixed usury ceiling in the same way it once did, because the legal ceiling on interest rates was effectively lifted. However, this does not mean lenders may impose any rate they want without limitation. Courts retain authority to strike down or reduce oppressive rates.

Interest rates such as 5%, 10%, or more per month have often been challenged as unconscionable, especially in private lending arrangements. Whether a rate is unconscionable depends on the facts, including:

The rate imposed;
The parties’ bargaining power;
The nature of the transaction;
Whether the borrower was in distress;
Whether the charges are compounded;
Whether penalties and interest together create an oppressive burden;
Whether the lender is a regulated entity;
The total amount demanded compared with the principal.

When a court finds the interest unconscionable, the borrower may not necessarily pay only principal. The court may instead reduce the interest to a reasonable rate.

E. When Penalties Are Excessive

A penalty clause is generally valid if agreed upon. However, courts may reduce penalties that are iniquitous or unconscionable.

For example, if a borrower owes ₱100,000 and the lender claims ₱500,000 in penalties after a short delay, the borrower may challenge the penalties. A court may reduce them substantially.

Again, this does not always mean the borrower pays only principal. It means the borrower may contest unlawful or excessive additions.

F. When Charges Are Hidden, Unauthorized, or Not Part of the Agreement

A borrower may refuse to pay charges that were not part of the loan agreement, such as surprise collection fees, undocumented service charges, inflated processing fees, or arbitrary “administrative charges.”

If the creditor cannot point to a contractual, statutory, or regulatory basis for the charge, the borrower may dispute it.

G. When the Creditor Cannot Prove the Additional Amounts

In court, the creditor has the burden of proving the obligation and the amounts claimed. If the lender can prove the principal but cannot prove the basis for interest, penalties, or other charges, the borrower may be ordered to pay only the principal or principal plus legally allowable damages.

V. When the Borrower Cannot Pay Only the Principal

There are also many situations where a borrower cannot simply tender principal and claim full payment.

A. When Interest Is Validly Stipulated in Writing

If the borrower signed a promissory note, loan agreement, disclosure statement, credit agreement, or other written document providing for interest, the borrower is generally bound by it.

Example:

A signs a promissory note stating: “I promise to pay B ₱100,000 with interest at 12% per annum, payable on December 31.” A cannot discharge the obligation by paying only ₱100,000 if the interest is valid and not excessive.

The creditor may lawfully demand both principal and interest.

B. When the Borrower Is in Default

Even if the original loan does not bear conventional interest, the borrower may become liable for legal interest as damages after default.

Default generally requires demand, unless demand is unnecessary under the contract or law. Once the borrower delays payment, the creditor may be entitled to damages in the form of legal interest.

Thus, a borrower who fails to pay an interest-free loan on maturity may still become liable for legal interest from the time of demand or judicial demand, depending on the circumstances.

C. When There Is a Valid Penalty Clause

If the borrower agreed in writing to pay penalties for late payment, the creditor may demand them, subject to the court’s power to reduce excessive penalties.

The borrower cannot automatically disregard a penalty clause merely because it is inconvenient or burdensome.

D. When Attorney’s Fees Are Validly Stipulated or Judicially Awarded

Attorney’s fees are not recoverable in every case. They must be supported by law, stipulation, or court award. If the loan agreement provides for attorney’s fees in case of collection suit, the creditor may claim them, although courts may reduce unreasonable attorney’s fees.

A borrower cannot assume that paying principal alone eliminates liability for attorney’s fees if litigation or collection became necessary due to default.

E. When the Loan Is with a Bank, Financing Company, Lending Company, or Credit Card Issuer

Loans from regulated financial institutions usually involve written agreements, disclosure statements, schedules of charges, interest rates, penalty rates, and acceleration clauses.

In such cases, the borrower’s obligation is not limited to the principal if the charges are properly disclosed and validly agreed upon. However, the borrower may still challenge illegal, undisclosed, abusive, or unconscionable charges.

VI. The Rule That Interest Must Be in Writing

The Civil Code rule that interest must be expressly stipulated in writing is central.

This rule covers conventional interest, meaning interest agreed upon as compensation for the use of money. The creditor cannot recover such interest unless the agreement is written.

A written stipulation may appear in:

A loan agreement;
A promissory note;
A deed of real estate mortgage;
A chattel mortgage;
A credit card agreement;
A financing agreement;
A disclosure statement;
A written acknowledgment of debt;
Text messages, emails, or electronic communications, if they satisfy evidentiary rules;
Other written instruments showing the borrower’s consent.

The writing must show not only that interest is due, but also the rate or a determinable basis for computing it. If the writing is vague, the court may construe ambiguity against the party who prepared the contract.

VII. Monetary Interest Versus Legal Interest

Philippine law distinguishes between monetary interest and legal interest.

A. Monetary Interest

Monetary interest is the interest agreed upon by the parties as compensation for the loan. It exists because of contract.

Example: “Borrower shall pay interest at 12% per annum.”

This must be in writing.

B. Legal Interest

Legal interest may be imposed by law or by courts as damages for delay or forbearance of money. It may apply even if the original loan had no agreed interest, especially after default or judicial demand.

Therefore, even where a borrower may refuse contractual interest because there is no written stipulation, the borrower may still be liable for legal interest once the obligation becomes due and unpaid under circumstances recognized by law.

VIII. Effect of Tendering Only the Principal

A borrower may attempt to pay only the principal. The legal effect depends on whether the full obligation includes other valid amounts.

A. If Only Principal Is Legally Due

If no interest, penalties, or charges are validly due, tender of the principal may extinguish the obligation if properly made and accepted.

If the creditor refuses to accept payment without valid reason, the borrower may consider remedies such as consignation.

B. If Interest or Other Charges Are Validly Due

If valid interest or charges are due, tendering only the principal is generally not full payment. The creditor may refuse to accept it as complete settlement.

The creditor may accept the amount as partial payment while reserving the right to collect the balance. The borrower should be careful when making partial payments, because payment may be applied according to rules on application of payments.

C. Acceptance Without Reservation

If a creditor accepts payment of the principal and issues a receipt stating “full payment,” “paid in full,” or similar language, this may support the borrower’s position that the obligation was settled.

However, the effect depends on the wording of the receipt, the circumstances, and whether there was mistake, fraud, or reservation of rights.

IX. Application of Payments

When a borrower owes principal, interest, and costs, the question arises: where does a payment go first?

Under Civil Code principles, if the debt produces interest, payment of the principal generally cannot be deemed made until the interest has been covered. This means that a creditor may apply payment first to interest before principal, unless a valid agreement or lawful application provides otherwise.

Example:

A owes ₱100,000 principal and ₱10,000 valid interest. A pays ₱100,000 and says it is for the principal only. If the creditor does not agree, the law may not treat the principal as fully paid while interest remains outstanding.

This is one reason why a borrower cannot always force a lender to accept “principal-only” payment.

X. Consignation When the Creditor Refuses Payment

If a borrower genuinely owes only the principal, or wants to stop further accruals, and the creditor refuses to accept payment, the borrower may consider consignation.

Consignation is the act of depositing the amount due with the court after complying with legal requirements. It is a formal way of paying when the creditor unjustifiably refuses to accept payment.

The usual steps involve:

There must be a valid debt that is due;
The borrower must make a valid tender of payment, unless tender is excused;
The creditor refuses without just cause;
The borrower gives notice of consignation to interested parties;
The borrower deposits the amount with the proper court;
The borrower gives notice after consignation.

Consignation must be done correctly. A defective consignation may fail to extinguish the obligation.

XI. Unconscionable Interest in Philippine Jurisprudence

Philippine courts have repeatedly held that while parties may agree on interest rates, courts may reduce rates that are unconscionable, excessive, or iniquitous.

The lifting of strict usury ceilings did not give lenders unlimited freedom. Freedom of contract remains subject to law, morals, good customs, public order, and public policy.

The court may reduce:

Excessive interest;
Excessive penalty charges;
Excessive attorney’s fees;
Compounded charges that produce oppressive results;
Charges that shock the conscience.

The usual result is not always cancellation of all interest. Courts often impose a reasonable rate instead.

Therefore, a borrower arguing that interest is excessive should not assume that the court will remove all interest. The more realistic remedy is reduction.

XII. Interest Rates After Maturity and During Litigation

A loan may involve different periods:

Before maturity;
After maturity but before demand;
After extrajudicial demand;
After filing of the complaint;
After judgment;
After finality of judgment until full satisfaction.

The applicable interest may differ depending on the contract and the nature of the obligation.

Where the contract provides a valid rate, that rate may apply according to its terms. If the rate is unconscionable, it may be reduced. If there is no stipulated interest, legal interest may apply as damages from the appropriate point, often from demand or judicial demand.

After a court judgment becomes final and executory, the judgment amount may earn legal interest until fully paid.

XIII. Loans Secured by Mortgage

If a loan is secured by a real estate mortgage or chattel mortgage, the borrower’s failure to pay the full amount due may allow foreclosure.

If the secured obligation includes valid principal, interest, penalties, and costs, the borrower must generally pay the full secured amount to prevent foreclosure or redeem the property, subject to applicable law.

However, the borrower may challenge:

Incorrect computation;
Unauthorized charges;
Excessive interest;
Excessive penalties;
Lack of notice;
Defects in foreclosure procedure;
Invalid acceleration of the debt.

A borrower cannot stop foreclosure merely by offering principal if valid interest and charges remain unpaid.

XIV. Credit Cards, Salary Loans, Financing, and Consumer Loans

In consumer credit, lenders often impose interest, finance charges, late payment fees, membership fees, processing fees, and other charges. These are usually contained in application forms, terms and conditions, disclosure statements, or electronic agreements.

Borrowers are generally bound by disclosed and accepted terms. However, they may dispute:

Charges not disclosed;
Charges not agreed upon;
Computation errors;
Excessive penalty charges;
Unauthorized transactions;
Fees imposed contrary to law or regulation;
Harassing or abusive collection practices.

A borrower who pays only principal on a credit card or financing obligation may still be considered delinquent if valid finance charges and penalties remain unpaid.

XV. Informal Loans Between Private Individuals

Many Philippine loan disputes arise from informal lending among relatives, friends, officemates, neighbors, or small private lenders.

Typical problems include:

No written agreement;
Verbal interest terms;
Very high monthly interest;
“Five-six” arrangements;
Payments without receipts;
Interest deducted in advance;
Renewed loans without accounting;
Blank documents signed by borrower;
Collateral held informally;
Threats or public shaming during collection.

In these situations, the borrower should carefully distinguish between what was borrowed, what was actually received, what was paid, and what was validly agreed upon in writing.

A borrower may have strong grounds to pay only principal where the lender cannot prove a written interest stipulation. But if there are written messages, signed notes, or receipts acknowledging interest, the issue becomes more fact-specific.

XVI. “Five-Six” Lending and High Monthly Interest

“Five-six” lending commonly refers to an arrangement where a borrower receives ₱5 and repays ₱6, or receives ₱5,000 and repays ₱6,000, usually over a short period. This effectively imposes a high interest rate.

The enforceability of such interest depends on proof, written stipulation, and conscionability. Courts may reduce excessive interest. In some cases, lenders may also face regulatory issues if they are engaged in lending as a business without proper authority.

Borrowers under such arrangements should not assume they are automatically free from all interest, but they may question oppressive rates and unauthorized lending practices.

XVII. Effect of Partial Payments

Partial payments may affect the borrower’s legal position.

They may:

Acknowledge the existence of the debt;
Interrupt prescription in some cases;
Reduce outstanding balance;
Be applied first to interest;
Serve as evidence of the parties’ understanding;
Support or weaken claims about agreed interest.

If a borrower has been paying interest for months or years, the lender may argue that the borrower recognized the interest obligation. But if the interest was not in writing, the borrower may still argue that conventional interest is legally unenforceable.

Evidence matters greatly.

XVIII. Receipts and Accounting

Borrowers should insist on written receipts for every payment. A receipt should ideally state:

Date of payment;
Amount paid;
Whether payment applies to principal, interest, penalty, or full settlement;
Remaining balance, if any;
Name and signature of creditor or authorized representative.

A borrower who wants to pay only the principal should state clearly in writing that the payment is tendered as payment of the principal and that disputed interest or charges are not admitted.

A creditor who accepts partial payment should also state whether the amount is accepted only as partial payment and without waiver of the remaining balance.

XIX. Can a Borrower Demand That Payments Be Applied to Principal First?

Not always.

If the debt earns valid interest, Civil Code principles generally prevent payment of principal from being deemed complete until interest is paid. The creditor may object to a unilateral principal-only application.

However, the parties may agree that payments will be applied first to principal. Some loan restructuring arrangements allow this.

In the absence of such agreement, the borrower should not assume that labeling a payment as “principal only” will bind the creditor.

XX. Can the Creditor Refuse Principal-Only Payment?

Yes, if principal-only payment is not full payment of the amount legally due.

A creditor is generally not required to accept partial performance when the obligation requires complete payment, unless the creditor agrees or the law provides otherwise.

However, the creditor should not refuse payment merely to increase penalties or interest if the full legally due amount is being tendered. If the borrower tenders the correct amount and the creditor unjustifiably refuses, consignation may become relevant.

XXI. Can the Borrower Be Sued After Paying Principal?

Yes, if valid interest, penalties, or charges remain unpaid.

Payment of principal alone does not automatically extinguish the entire obligation if accessory obligations remain validly due.

The creditor may sue for the unpaid balance, although the borrower may raise defenses such as:

No written stipulation on interest;
Excessive or unconscionable interest;
Unlawful penalties;
Full payment;
Accord and satisfaction;
Waiver;
Prescription;
Lack of authority of collector;
Incorrect accounting;
Invalid or incomplete documents.

XXII. Prescription of Loan Claims

A borrower may also examine whether the creditor’s claim has prescribed. Prescription depends on the nature of the written or oral obligation and the applicable Civil Code rules.

Generally, actions based on written contracts have a longer prescriptive period than actions based on oral contracts. If the creditor slept on their rights for too long, the borrower may raise prescription as a defense.

Prescription does not mean the borrower paid only principal; it means the legal action to enforce the claim may be barred.

XXIII. Novation, Restructuring, and Waiver

A borrower and creditor may agree to restructure the loan. They may agree that the borrower will pay only the principal, or that interest and penalties will be waived.

This is common in settlements.

A waiver of interest or penalties should be in writing. The agreement should clearly state whether payment of a specific amount constitutes full settlement.

Example wording:

“Creditor agrees to accept the amount of ₱100,000 as full and complete settlement of Borrower’s outstanding obligation, inclusive of principal, interest, penalties, charges, attorney’s fees, and all other claims arising from the loan.”

Without clear wording, disputes may arise later.

XXIV. Dation in Payment and Compromise

Instead of paying money, the borrower may settle through dation in payment, where property is transferred to the creditor in satisfaction of the debt. The parties may also enter into a compromise agreement.

These arrangements depend on creditor consent. A borrower cannot force a creditor to accept property or a reduced amount unless allowed by law or court judgment.

XXV. Small Claims Cases

Many loan disputes in the Philippines are filed as small claims cases, depending on the amount and nature of the claim. Small claims procedure is designed to be simpler and faster, and lawyers are generally not allowed to appear for parties during the hearing.

In small claims, the borrower may raise defenses such as lack of written interest stipulation, excessive interest, payment, or incorrect computation.

The court may order payment of principal, interest, penalties, or a reduced amount depending on the evidence.

XXVI. Collection Practices and Borrower Rights

Even if a borrower owes money, creditors and collectors must not use abusive, threatening, defamatory, or unlawful methods.

Improper collection practices may include:

Threats of imprisonment for mere non-payment of debt;
Public shaming;
Posting the borrower’s name or photo online;
Harassing relatives, employers, or contacts;
Misrepresenting oneself as a lawyer, police officer, or court employee;
Sending false court documents;
Using violence or intimidation;
Unlawful access to personal data;
Repeated calls at unreasonable hours;
Disclosure of debt to unrelated third persons.

A borrower’s liability for a valid debt is separate from the creditor’s obligation to collect lawfully.

XXVII. Non-Payment of Debt Is Generally Not a Crime

As a rule, mere failure to pay a loan is not imprisonment-worthy. The Philippine Constitution prohibits imprisonment for debt.

However, criminal liability may arise if the facts involve fraud, bouncing checks, falsification, estafa, or other criminal acts. The distinction is important.

A borrower who merely cannot pay is different from a borrower who obtained money through deceit or issued checks under circumstances covered by penal laws.

XXVIII. Practical Guidance for Borrowers

A borrower who wants to pay only the principal should take the following steps:

Review all signed documents;
Check whether interest is expressly stipulated in writing;
Check the stated rate of interest;
Check whether penalties are provided;
Ask for a written statement of account;
Compare the lender’s computation with actual payments made;
Gather receipts, screenshots, bank transfers, and messages;
Identify charges not agreed upon;
Make a written tender of the amount admitted to be due;
Avoid verbal-only settlements;
Secure a written release or full settlement receipt;
Consider consignation if the creditor unjustifiably refuses lawful payment;
Seek legal advice before ignoring written loan terms or foreclosure notices.

The borrower should not simply stop paying or assume that all interest is illegal.

XXIX. Practical Guidance for Creditors

A creditor who wants to enforce interest and charges should:

Put the loan agreement in writing;
Clearly state the principal;
Clearly state the interest rate;
State whether interest is monthly, annual, simple, or compounded;
State due dates;
State penalties for default;
Issue receipts for payments;
Maintain a running account;
Avoid excessive rates;
Avoid abusive collection practices;
Document demand letters;
Ensure compliance with lending regulations if engaged in lending as a business.

A creditor who relies on verbal interest terms risks recovering only the principal and legally allowable damages.

XXX. Common Scenarios

Scenario 1: No Written Interest

Borrower received ₱100,000. There is no written interest agreement. The creditor demands ₱100,000 plus 10% monthly interest.

Likely result: Borrower may contest the interest. Creditor may recover principal, and possibly legal interest as damages from default or demand, but not the verbal 10% monthly conventional interest.

Scenario 2: Written Interest at 12% Per Annum

Borrower signed a note for ₱100,000 with 12% annual interest.

Likely result: Borrower cannot pay principal only. Interest is likely enforceable if not otherwise illegal or unconscionable.

Scenario 3: Written Interest at 10% Per Month

Borrower signed a note with 10% monthly interest.

Likely result: The interest is in writing, but borrower may challenge it as unconscionable. A court may reduce it.

Scenario 4: Principal Paid, Receipt Says “Full Payment”

Borrower pays principal. Creditor issues receipt stating “full payment of loan.”

Likely result: Borrower has a strong argument that the obligation was settled, especially if there was no reservation of rights.

Scenario 5: Principal Paid, Receipt Says “Partial Payment”

Borrower pays principal. Creditor issues receipt saying “partial payment only; interest and penalties unpaid.”

Likely result: Creditor may still pursue valid unpaid amounts.

Scenario 6: Interest-Free Loan Paid Late

Borrower owes ₱100,000 interest-free, due January 1. Borrower fails to pay despite demand.

Likely result: Borrower may owe principal plus legal interest as damages from the relevant point of default or demand.

XXXI. Key Legal Principles

The topic may be reduced to these principles:

Principal is always due if the loan is valid and unpaid.
Interest is not presumed.
Conventional interest must be expressly stipulated in writing.
A borrower may refuse unwritten contractual interest.
Valid written interest is generally enforceable.
Courts may reduce unconscionable interest.
Penalties may also be reduced if excessive.
Legal interest may apply as damages after default.
Payment of principal alone is not full payment if valid accessories remain due.
A creditor may refuse principal-only payment if it is merely partial payment.
A borrower may use consignation if the creditor unjustifiably refuses the correct payment.
A settlement should clearly state whether interest and penalties are waived.

XXXII. Conclusion

In Philippine law, a borrower is not automatically entitled to pay only the principal on a loan. The borrower must pay the principal and all validly agreed, lawful, and reasonable additions, such as written interest, penalties, attorney’s fees, and collection costs.

However, a borrower may legally resist paying more than the principal when the creditor’s claim for interest or charges has no written basis, was not agreed upon, is unsupported by evidence, or is excessive and unconscionable. Courts may reduce oppressive interest and penalties, and in some cases the recoverable amount may effectively be limited to the principal plus legally allowable interest or damages.

The decisive questions are: Was the interest or charge agreed upon in writing? Is it lawful? Is it reasonable? Has the borrower defaulted? Has the creditor proved the computation? Has there been waiver, settlement, or full payment?

A borrower may pay only the principal when only the principal is legally due. But when valid interest, penalties, or other lawful charges are due, principal-only payment is generally not enough to extinguish the debt.