In the Philippine real estate market, full payment of the purchase price creates a binding obligation for the seller to transfer ownership. When a seller refuses to execute a formal Deed of Absolute Sale (DOAS) despite receiving the complete consideration, the buyer is not helpless. Philippine law provides several robust avenues for redress.

1. The Legal Basis: The Obligation to Deliver

Under the Civil Code of the Philippines, a contract of sale is consensual and bilateral. Once the buyer fulfills the obligation to pay, the seller’s reciprocal obligation—to deliver the thing sold and transfer ownership—becomes demandable.

Article 1458: Defines the sale where the seller obligates himself to transfer ownership.
Article 1497: Ownership is transferred through delivery (actual or constructive).
Article 1357: If the law requires a specific form (like a public instrument for real property) to make a contract effective or enforceable, the contracting parties may compel each other to observe that form once the contract is perfected.

2. Initial Steps: Demand and Mediation

Before jumping into a courtroom, certain procedural steps are often required to establish a cause of action:

Formal Demand Letter: A written demand, usually sent via registered mail with a return card, serves as legal proof that the buyer has demanded the execution of the Deed. This puts the seller in legal delay (mora).
Barangay Conciliation: If both parties reside in the same city or municipality, the case must generally go through the Katarungang Pambarangay (Barangay Justice System) before a complaint can be filed in court. A "Certificate to File Action" is required if mediation fails.

3. Judicial Remedies: Filing a Lawsuit

If the seller remains adamant, the buyer can file a civil case in the Regional Trial Court (RTC) where the property is located.

A. Action for Specific Performance

The primary remedy is a Complaint for Specific Performance. The buyer asks the court to order the seller to execute the Deed of Absolute Sale.

Court-Executed Deeds: If the seller still refuses to sign despite a court order, Rule 39, Section 10 of the Rules of Civil Court allows the court to appoint another person (often the Branch Clerk of Court) to execute the document on the seller's behalf. This deed has the same legal effect as if the seller signed it.

B. Action for Rescission (Resolution)

Under Article 1191 of the Civil Code, the injured party can choose between fulfillment (specific performance) or the rescission of the obligation.

If the buyer no longer wants the property due to the breach of trust, they can sue to cancel the contract.
The seller will be ordered to return the full payment plus interest and potentially damages.

C. Petition for Consignation (If payment was refused)

If the seller refuses to accept the final payment to avoid issuing the deed, the buyer may deposit the money with the court (Consignation) to prove full payment and satisfy their side of the contract.

4. Damages and Attorney's Fees

In a lawsuit, the buyer can also pray for:

Actual/Compensatory Damages: To cover proven financial losses.
Moral Damages: For mental anguish and anxiety caused by the seller's refusal.
Exemplary Damages: To set a public example if the seller acted in a wanton or fraudulent manner.
Attorney’s Fees: To recover the costs of hiring legal counsel.

5. Special Considerations

The Maceda Law (R.A. 6552)

While primarily protecting buyers on installments, the spirit of the Maceda Law reinforces the rights of buyers who have religiously paid their dues. It ensures that buyers are not easily deprived of their investment.

PD 957 (Subdivision and Condominium Buyer's Protective Decree)

If the seller is a real estate developer, the buyer should file the complaint with the Department of Human Settlements and Urban Development (DHSUD), formerly the HLURB, rather than the regular courts. The DHSUD has quasi-judicial powers to:

Compel the issuance of the Title/Deed.
Impose administrative fines on developers.
Order the completion of the project.

Notice of Lis Pendens

Upon filing a court case, the buyer should record a Notice of Lis Pendens (litigation pending) on the property's title at the Registry of Deeds. This warns the whole world—and any prospective "innocent" buyers—that the property is under dispute, preventing the seller from selling it to someone else during the trial.

6. Criminal Liability

If the seller’s refusal is rooted in the fact that they already sold the property to another person, or if they never owned the property to begin with, they may be criminally liable for Estafa (Fraud) under the Revised Penal Code. This involves the use of deceit or false pretenses to defraud the buyer of their money.