In short
This chapter settles two different questions. The first: you may contract over something that does not yet exist or is not yours. A contract whose object is a future or another’s property is valid if it meets the requirements of object set in Book One; it is aleatory if the existence of the thing is not guaranteed, and otherwise commutative and conditional. Whoever promises a future or another’s thing must use their greatest diligence for it to come into existence or enter their patrimony, and if the contract aims to transfer ownership of another’s thing, it will be only a title for a new acquisition, occurring when the transferor acquires the thing and complies with the corresponding mode. With a flat prohibition at the end: a contract on a future inheritance is forbidden. The second question is the paperwork. The following must appear in a public or private instrument, for evidentiary purposes: the creation, transmission, modification or extinction of real rights over immovables; the lease of immovables for six years or more; the assignment or waiver of hereditary rights or of those of the conjugal partnership; the power of attorney to be presented in court, the power to administer property, and powers affecting third parties’ rights; and the assignment of rights or actions arising from an act recorded in a public document. And if someone refuses to sign, the contracting parties may reciprocally compel each other to execute the required formality.
What is it?
It is Chapter III of Title I of Book Five of the Civil Code of 2020, Articles 1244 to 1246. It deals with two elements of a contract: what may be its object — including what does not yet exist or is not yours — and which deals must be put in writing.
Who can do it?
Anyone entering into one of the five contracts in Article 1245, or contracting over a future or another’s property. Nobody may contract over a future inheritance: it is forbidden.
Requirements
- That the contract over a future or another’s property meet the requirements of object described in Chapter Two of Title Four of Book One of the Code.Verified against the official source
- That whoever promises a future or another’s thing use their greatest diligence for it to come into existence or enter their patrimony.Verified against the official source
- That the five acts in Article 1245 appear in a public or private instrument, for evidentiary purposes.Verified against the official source
Documents you need
Cost
Step by step
Step 1: You can sell what does not yet exist
Article 1244 admits it: a contract whose object is a future or another’s property is valid if it meets the requirements of object described in Chapter Two of Title Four of Book One of this Code. Those requirements live in another book and we did not read them for this guide.
Step 2: And what kind of contract results
The same article classifies it by who bears the risk: the contract over a future or another’s thing is aleatory if the existence of the thing is not guaranteed; otherwise it is commutative and conditional. If you guarantee it will exist, you stop gambling.
Step 3: What is required of whoever promises
Article 1244 does not leave the promisor idle: the person who promises a future or another’s thing must use their greatest diligence for it to come into existence or enter their patrimony. And if the contract aims to transfer ownership of another’s thing, it will be only a title for a new acquisition, occurring when the transferor acquires the thing and complies with the mode corresponding to it.
Step 4: What cannot be contracted
A five-word sentence closes the article: a contract on a future inheritance is prohibited. No nuance and no conditions; the Code forbids it, full stop.
Step 5: The five that must be put in writing
Article 1245 lists them, and says what for: for evidentiary purposes. They are the creation, transmission, modification or extinction of real rights over immovables; the lease of immovables for six years or more; the assignment or waiver of hereditary rights or of those of the conjugal partnership; the power of attorney to be presented in court, the power to administer property, and powers affecting third parties’ rights; and the assignment of rights or actions arising from an act recorded in a public document.
Step 6: Six years is the lease threshold
Subsection (b) draws the line without ambiguity: the lease of immovables for six years or more. Six years is in; less than six does not fall on this list. The figure is the statute’s.
Step 7: And what requires a solemn form goes by another law
The last paragraph of Article 1245 refers out: acts, juridical acts and contracts for which the law requires a solemn form are governed by that law. We did not read those laws, so this guide names no contract as void for lack of a deed: the list above is what the Code asks for evidentiary purposes, which is a different thing.
Step 8: If the other side refuses to sign
Article 1246 gives the remedy: in the case of the preceding article, the contracting parties may reciprocally compel each other to execute the formality required for the effectiveness of a valid contract, and may join the action for contractual performance. That is, the signature and the performance can be sought in the same case.
Where to do it
The public instrument is executed before a notary, whose rules we did not read here. The action to compel execution of the formality is filed before the Court of First Instance. The Code names no agency here.
How long it takes
What to do if something goes wrong
If your question is whether a contract is void for not being in a deed, this guide does not answer it: Article 1245 asks for the instrument for evidentiary purposes, and nullity for lack of a solemn form is fixed by the special statute requiring that form, which we did not read. If what you assign are hereditary rights, see also the guide on the assignment of inheritance rights. If the contract is a lease, note the six-year threshold in subsection (b). This guide also does not explain Chapter Two of Title Four of Book One, which sets the requirements of object and which Article 1244 invokes. The Code publishes no fee and no term for these articles. MiPRFácil does not represent anyone in court and gives no legal advice.
Common mistakes
- Believing you cannot contract over something that does not yet exist: the Code admits it if the object meets the requirements.
- Promising a future thing and doing nothing: the greatest diligence must be used for it to come into existence or enter the patrimony.
- Treating ownership of another’s thing as transferred on signature alone: it is only a title for a new acquisition.
- Signing a contract over a future inheritance: it is forbidden.
- Leaving undocumented a lease of an immovable for six years or more.
- Granting orally a power to administer property or one affecting third parties’ rights.
- Confusing the instrument Article 1245 asks for evidentiary purposes with the solemn form other statutes require.
- Being left without a signature when the other side refuses: Article 1246 allows compelling each other and joining the performance action.
Frequently asked questions
Which contracts must be in writing?
The five in Article 1245, for evidentiary purposes: real rights over immovables, leases of immovables for six years or more, assignment or waiver of hereditary or conjugal-partnership rights, certain powers of attorney, and the assignment of rights or actions arising from an act in a public document.
Can I sell something that is not yet mine?
The contract is valid if the object meets the requirements set in Book One, but if it aims to transfer ownership of another’s thing it will be only a title for a new acquisition, occurring when you acquire the thing and comply with the corresponding mode.
Can a deal be made over an inheritance not yet opened?
No. Article 1244 expressly forbids it: a contract on a future inheritance is prohibited.
The other side will not sign the deed — what do I do?
Article 1246 allows the contracting parties to reciprocally compel each other to execute the formality required for the effectiveness of a valid contract, and to join the action for contractual performance.
Official sources
These are the government pages this guide is based on.
- Poder Judicial de Puerto Rico
Poder Judicial
bvirtualogp.pr.gov
Last verified
September 8, 2026
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