In the Philippine legal system, a Demand Letter is often the first formal step toward resolving a dispute without litigation. It serves as an extrajudicial attempt to settle a claim, whether it involves a collection of sum of money, a breach of contract, or an ejectment case.

Under Article 1169 of the Civil Code of the Philippines, those obliged to deliver or to do something incur in delay from the time the obligee (creditor/claimant) judicially or extrajudicially demands from them the fulfillment of their obligation. Without this formal demand, a debtor may not technically be in legal "delay," which can weaken a future court case.

1. Essential Components of a Demand Letter

For a demand letter to be effective and legally sound, it must be clear, concise, and contain specific elements.

Header and Party Identification

Date: The date when the letter is written.
Sender’s Information: Full name and address. If written by a lawyer, it should be on the law firm's letterhead.
Recipient’s Information: The full legal name and current address of the person or entity being demanded. Accuracy here is vital for future service of court summons.

The Body of the Letter

Statement of Facts: A brief narration of the circumstances. For example, "On [Date], you entered into a contract to provide [Service/Amount], which remains unfulfilled as of this date."
The Specific Demand: Clearly state what you want. Whether it is the payment of ₱100,000.00, the repair of a property, or the vacation of a premises, the demand must be unequivocal.
Legal Basis: Mention the contract, promissory note, or specific laws (e.g., Civil Code or BP 22 for bouncing checks) that support your claim.
The Grace Period (Deadline): Provide a reasonable timeframe for the recipient to comply. In the Philippines, five (5) to fifteen (15) calendar days from receipt is standard.
Consequence of Non-Compliance: State that if the demand is not met within the period, you will be forced to protect your interests through legal action (civil or criminal) and claim damages/attorney's fees.

2. The Legal Significance of the Demand

In many Philippine civil actions, the "Cause of Action" only matures once a demand is made and subsequently ignored.

Mora Solvendi: This refers to the delay on the part of the debtor. Legal interest generally begins to run from the time of judicial or extrajudicial demand.
Ejectment Cases: In Unlawful Detainer cases, a "Demand to Pay and Vacate" is a jurisdictional requirement. Without proof of this demand, the court can dismiss the case for lack of cause of action.
Bouncing Checks (BP 22): To prosecute someone for a bouncing check, the law requires a written Notice of Dishonor. This demand letter gives the issuer five banking days to settle the amount to avoid criminal liability.

3. How to Send a Demand Letter

How you send the letter is just as important as what is written inside. In Philippine courts, you must prove not just that you sent the letter, but that the recipient received it.

Registered Mail (via PHLPost)

This is the most "court-friendly" method.

The Return Card: When sending via the Post Office, request a "Return Card" (the small yellow card). Once the recipient receives the letter, they sign this card, and it is mailed back to you.
Registry Receipt: Keep the original receipt issued by the post office.

Personal Service

You or a representative can deliver the letter by hand.

Proof of Receipt: The recipient must sign a "receiving copy" of the letter, indicating their printed name, signature, and the date/time of receipt.
Refusal to Sign: If the recipient refuses to sign, the person delivering the letter should write "Refused to Sign" and have a witness sign an affidavit of service.

Private Couriers (LBC, JRS, etc.)

While faster, these are sometimes scrutinized more heavily in court compared to registered mail. Ensure you keep the tracking number and print the delivery status from the courier's website showing "Delivered to [Name]."

4. The Role of Notarization

A demand letter does not strictly need to be notarized to be legally valid. However, notarizing it converts the letter from a private document into a public document.

Evidentiary Weight: A notarized letter is self-authenticating in court, meaning you don't necessarily have to prove the signature of the sender.
Psychological Impact: A notarized letter, especially one drafted by an attorney (a "Lawyer’s Demand Letter"), carries more weight and shows the recipient that you are prepared to take the matter to court.

5. Pre-condition: The Barangay Conciliation

Before filing a case in court based on your demand letter, remember the Katarungang Pambarangay Law.

If both parties reside in the same city or municipality, the dispute must generally undergo mediation at the Lupong Tagapamayapa (Barangay level).
If the demand letter fails, your next step is usually to file a complaint at the Barangay to obtain a Certificate to File Action, which is a prerequisite for most civil cases in the Philippines.

6. Summary Checklist

Requirement	Action
Clear Intent	Use the word "DEMAND" explicitly.
Specific Amount	State the exact figures, including interest if applicable.
Deadline	Set a clear date (e.g., "within 7 days from receipt").
Proof of Service	Secure the Post Office Return Card or a signed receiving copy.
Consistency	Ensure the facts match your supporting documents (contracts/receipts).