General Rule on Capacity
In a contract of sale, capacity must exist on both sides because the seller assumes the obligation to transfer ownership and deliver, while the buyer assumes the obligation to pay a certain price. Article 1489 states the governing rule: all persons who are authorized by law to obligate themselves may enter into a contract of sale, subject to the special disqualifications found in the law on sales and in related statutes.
Capacity to sell is not identical with ownership, title, or authority. A person may be legally capacitated to contract but unable to bind the owner because he has no authority; conversely, an agent may have authority to sell but may be disqualified from buying the property entrusted to him. Capacity concerns the person's legal fitness to enter the sale; authority concerns the representative's power to bind another; ownership concerns the seller's ability to transfer title at delivery.
The general rules on consent apply to sales. A sale entered into by a person who cannot give valid consent is ordinarily voidable, not void, because the defect lies in the capacity of a party rather than in the object or cause. A sale entered into by a person absolutely prohibited by law from buying particular property may be void or subject to annulment depending on the policy protected by the prohibition.
Persons with Restricted Capacity to Contract
Minors and persons who, at the time of contracting, cannot understand the nature and consequences of the act are protected by the rules on voidable contracts. Their incapacity does not allow the capable party to escape a bad bargain; the protection belongs to the incapacitated party and to those legally authorized to act for him.
A voidable sale is binding until annulled. It may be ratified by the guardian during incapacity or by the incapacitated party after capacity is recovered, provided the ratification is made with knowledge of the reason that made the contract voidable. Ratification extinguishes the action to annul and cleanses the contract from the defect of incapacity.
When annulment is decreed because of incapacity, mutual restitution follows, but the incapacitated person is required to return only to the extent that he was benefited. This rule prevents the capable party from shifting the full loss to the person whom the law intended to protect.
Necessaries Sold to Incapacitated Persons
Article 1489 creates an important qualification: where necessaries are sold and delivered to a minor or to another person without capacity to act, he must pay a reasonable price for them. The liability is not based on full contractual capacity but on the policy that no person should be unjustly enriched by receiving indispensable support items.
Necessaries are determined according to the recipient's condition and include items indispensable for sustenance, dwelling, clothing, medical attendance, education, and transportation. The seller recovers only the reasonable value, not necessarily the contract price, because the law supplies an equitable obligation rather than enforcing the bargain in full.
Spouses as Buyer and Seller
Article 1490 prohibits spouses from selling property to each other during the marriage, except when separation of property was agreed upon in the marriage settlements or when there has been a judicial separation of property. The prohibition applies to both spouses and is grounded on the prevention of fraud against creditors, undue influence, and indirect circumvention of restrictions on donations between spouses.
A sale between spouses covered by the prohibition is void because the law withholds capacity from the parties with respect to that particular transaction. The invalidity cannot be cured by labeling the transfer as a sale if the arrangement is a disguised donation or a device to place property beyond the reach of creditors.
The prohibition is confined to sales between the spouses themselves. It does not, by itself, prevent either spouse from selling property to a third person, but the sale must still comply with the rules governing the applicable property regime, the family home, agency, and administration of common property.
For community or conjugal property, one spouse's unilateral disposition without the other spouse's consent or court authority is ineffective under the Family Code rules on administration and enjoyment. The issue in that situation is not the buyer's capacity to buy from the spouses, but the selling spouse's authority to dispose of property belonging to the marital regime.
Transfers between persons living together as husband and wife without a valid marriage require a separate analysis. The Family Code invalidates donations and gratuitous advantages between such parties, but an actual onerous sale for adequate consideration is not invalid merely because the parties cohabit, unless the transaction is simulated, fraudulent, or otherwise prohibited.
Special Disqualifications to Buy
Article 1491 disqualifies certain persons from acquiring particular property by purchase, even at a public or judicial auction and even through another person. The prohibition is based on fiduciary duty, conflict of interest, public policy, and the need to preserve confidence in public administration and the administration of justice.
| Disqualified buyer | Property covered | Controlling principle |
|---|---|---|
| Guardian | Property of the person under guardianship | The guardian must protect and administer the ward's property, not acquire it for personal benefit. |
| Agent | Property whose administration or sale was entrusted to the agent | The agent may not place personal interest above the principal's interest, unless the principal gives informed consent. |
| Executor or administrator | Property of the estate under administration | The estate representative must preserve and liquidate estate property for the heirs, creditors, and estate, not for self-dealing. |
| Public officer or employee | Property of the State, local government, government corporation, or government institution entrusted to him | Public office cannot be used to obtain a personal advantage in property entrusted to official responsibility. |
| Judicial officer, prosecutor, clerk, and court employee | Property or rights in litigation or levied upon execution before the court within the officer's jurisdiction | The courts must remain free from the appearance and reality of official influence over litigated property. |
| Lawyer | Property or rights in litigation in which the lawyer takes part by virtue of the profession | A lawyer may not acquire the subject of the litigation from the client or another party while professional participation creates divided loyalty. |
| Other persons specially disqualified by law | Property covered by the particular statute or rule | Special incapacity may arise from constitutional restrictions, land laws, corporate law, insolvency, public bidding rules, or other specific policies. |
Purchases Through Intermediaries
The prohibition covers purchases made directly, indirectly, or through the mediation of another. A disqualified buyer cannot validate the acquisition by using a spouse, relative, employee, corporation, nominee, or straw buyer if the beneficial ownership or real advantage is intended for the disqualified person.
Courts look at substance rather than form. If the intermediary merely holds title for the prohibited buyer, the transaction is treated as the prohibited buyer's acquisition. If the intermediary uses independent funds, assumes real risks, and acquires for his own account, the prohibition is not applied merely because of relationship or association.
Effect of Violation
The effect of violating a special disqualification depends on the interest protected. Where the prohibition protects a private beneficiary from fiduciary self-dealing, the protected person may attack the sale, recover the property, or demand the benefits obtained by the fiduciary; informed consent or ratification may be relevant where the law allows it.
Where the prohibition protects public office, judicial integrity, or the administration of justice, the sale is void for public policy and cannot be ratified by private agreement. This stricter effect applies because the injury is not limited to a private principal, ward, estate, client, or litigant; the transaction impairs public confidence in institutions.
A person disqualified from buying cannot evade liability by claiming that the sale was made at a public auction. Article 1491 expressly includes public and judicial auctions because competitive bidding does not remove the fiduciary conflict or the public policy concern.
Agents, Representatives, and Authority to Sell
An agent who sells for the owner must have authority to do so, and the required form of authority depends on the property and act involved. For a sale of land or an interest in land, the agent's authority must be in writing; without written authority, the sale made through the agent is void as to the principal.
A special power is required for acts of strict dominion, including the sale or encumbrance of real property. A general authority to manage property does not ordinarily include the power to sell it, because management preserves and administers while sale disposes of ownership.
A person who contracts in the name of another without authority, or beyond the scope of authority, does not bind the alleged principal unless the principal ratifies the act. The issue is enforceability against the principal, not the personal capacity of the unauthorized actor to enter into his own contracts.
Corporate officers, partners, trustees, guardians, administrators, and similar representatives must act within the authority granted by law, governing documents, court orders, or the principal. Capacity to contract does not substitute for board approval, partner authority, trust authority, or court approval when the law requires such authority for disposition.
Capacity to Acquire Land
In sales involving Philippine land, the buyer's constitutional and statutory capacity to acquire land is distinct from ordinary civil capacity to contract. A buyer may be of age, sane, and otherwise able to bind himself, yet still be legally incapable of acquiring private land because of nationality restrictions.
| Buyer | Capacity to acquire Philippine private land |
|---|---|
| Filipino citizen | May acquire private land, subject to ordinary civil law limits, land laws, property regime rules, and restrictions on particular classes of land. |
| Philippine corporation or association at least sixty percent Filipino-owned | May acquire private land if otherwise qualified, with Filipino ownership required to be real, lawful, and continuing. |
| Alien individual | Generally cannot acquire private land, except through hereditary succession; a direct sale of land to an alien is void as to the land. |
| Former natural-born Filipino citizen | May acquire private land within statutory limits and for purposes allowed by law. |
| Alien-owned corporation | Cannot acquire private land beyond what the Constitution and special laws allow; use of dummies or simulated Filipino ownership does not create capacity. |
Registration of the deed or issuance of a certificate of title does not validate a sale to a buyer who is constitutionally disqualified from owning land. The Torrens system confirms and protects registrable title; it does not confer capacity where the Constitution withholds it.
An alien may acquire rights that the law permits, such as ownership of improvements separate from the land, condominium units within nationality limits, leasehold rights within statutory limits, and land by hereditary succession. These permitted interests should not be confused with ownership of private land through an ordinary sale.
Seller's Ownership and Power to Transfer
The seller need not always be the owner at the moment the contract is perfected, because the obligation in a sale is to transfer ownership upon delivery. A person may validly undertake to sell property he expects to acquire, but he must be able to deliver ownership when performance becomes due.
If the seller lacks title or authority at delivery, the buyer may refuse to pay, demand performance if possible, seek rescission or damages, or invoke warranties depending on the circumstances. The defect is not always lack of capacity; it may be lack of ownership, lack of authority, breach of warranty, or failure of performance.
A sale of another's property is not automatically void between the contracting parties solely because the seller was not the owner at perfection. It becomes problematic when the seller cannot later acquire title, cannot cause the owner to convey, or falsely represented authority to sell.
Property in custodia legis, estate property, guardianship property, corporate property, partnership property, trust property, and property under court supervision may require approval or authority before valid disposition. The person handling the property may have civil capacity but still lack legal power to sell without the required approval.
Practical Classification of Defects
| Defect | Typical consequence | Person who may invoke it |
|---|---|---|
| Minority or mental incapacity affecting consent | Voidable sale, subject to ratification or annulment | Incapacitated party, guardian, or proper representative |
| Sale of necessaries to an incapacitated person | Liability for reasonable value of necessaries delivered | Seller may recover reasonable price |
| Sale between spouses prohibited by Article 1490 | Void sale | Spouses, creditors, heirs, or affected parties as the case warrants |
| Fiduciary buys property entrusted to him | Sale may be attacked by the protected person; profits may be recovered | Ward, principal, estate, beneficiary, or other protected party |
| Public officer, court officer, or lawyer buys prohibited property | Void sale for public policy | Affected parties and, when appropriate, the State or the court |
| Agent sells land without written authority | Sale is void as to the alleged principal | Principal or person whose property was purportedly sold |
| Constitutionally disqualified buyer acquires land by sale | No valid transfer of land ownership | State, affected parties, or persons allowed by law to question the transfer |
Ratification, Consent, and Waiver
Ratification applies to defects that the law treats as private and curable, such as voidable contracts due to incapacity and unauthorized contracts that the principal later adopts. Ratification requires knowledge of the defect and an act showing an intention to be bound.
Consent may remove a conflict only when the law allows it, as with an agent purchasing property entrusted to him if the principal gives informed consent. Consent is ineffective when the prohibition exists to protect public policy, judicial integrity, creditors, or constitutional restrictions.
Waiver by the protected party cannot validate a sale that the law declares void for reasons beyond private interest. A spouse cannot waive Article 1490 during a prohibited property regime, a lawyer cannot validate the purchase of litigated property by client consent alone, and an alien cannot acquire private land by agreement with a Filipino seller.
Remedies and Consequences
When the defect is voidability, the remedy is annulment, subject to ratification and the rules on restitution. The contract remains effective until annulled, so acts of ownership or possession may have legal consequences before a successful action is brought.
When the defect is lack of authority, the alleged principal is generally not bound unless he ratifies, but the unauthorized actor may incur personal liability for breach of warranty of authority, damages, or other consequences arising from misrepresentation.
When the defect is a statutory or constitutional disqualification, the sale produces no valid acquisition of the prohibited property. Restitution, recovery of the property, cancellation of title, reconveyance, forfeiture, or disciplinary liability may follow depending on the violated rule and the parties involved.
Capacity to buy or sell is therefore assessed at three levels: the party's civil capacity to consent, the party's special legal qualification or disqualification regarding the property, and the representative's authority to bind the real owner. A valid sale requires all three levels to support the transaction when they are relevant.