In short
The Code gathers three ways for someone who did not sign to enter the contract. The first: one or both parties may reserve on contracting the power to later designate a third party to assume their position in the contract, except where one may not contract through a representative or where determining the subjects is mandatory at the time of contracting; once the designation is made within the agreed period or, failing that, within thirty days, the stipulator must communicate it to the other contracting party, and the contract produces effects between the original parties until the communication is made, from which point, retroactively, the third party is bound and the stipulator released. The second: the contract on a third party’s act, by which one party binds themselves to carry out the activity necessary for the third party to perform the promised performance; the obligation consists in employing the adequate means, unless the result is guaranteed, and the third party’s performance releases the promisor. The third: the stipulation in favour of a determined or determinable third party, who may demand its performance if they communicate their acceptance to all the parties, with five rules governing who accepts, who may revoke, what defences lie, what is not transmitted to heirs or creditors, and the mandate to interpret the stipulation restrictively.
What is it?
It is Chapter V of Title I of Book Five of the Civil Code of 2020, Articles 1250 to 1252. It gathers the three figures by which someone who did not sign the contract ends up inside it: taking a party’s place, being the one who must perform, or being the one who collects.
Who can do it?
Any contracting party who reserves designating a third party, promises a third party’s act, or stipulates in favour of a determined or determinable third party. The reservation in Article 1250 does not lie where one may not contract through a representative nor where determining the subjects is mandatory at the time of contracting.
Requirements
- Reserving the power to designate the third party at the time of contracting, not afterwards.Verified against the official source
- Designating within the period the parties set or, failing that, within thirty (30) days, and communicating it to the other contracting party.Verified against the official source
- For the third-party beneficiary to demand performance, that they communicate their acceptance to all the parties.Verified against the official source
Documents you need
Cost
Step by step
Step 1: Signing today and saying later who takes your place
Article 1250 allows it: one or both parties may reserve on contracting the power to later designate a third party to assume their position in the contract. With two exceptions: cases where one may not contract through a representative, and those where determining the subjects is mandatory at the time of contracting.
Step 2: Thirty days if no other period was agreed
The same article sets a clock: once designated, within the period the parties set or, failing that, within thirty days, if the third party assumes the contractual position, the stipulator must communicate it to the other contracting party. The agreed period governs; the thirty days are the fallback.
Step 3: The communication is what changes everything
The third paragraph settles it: the contract produces effects between the original parties until the communication is made, and from then, retroactively, the third party is bound and the stipulator released. Until it is communicated, whoever signed remains the one bound.
Step 4: Promising that a third party will do something
Article 1251 defines the figure: the contract on a third party’s act is that by which one party binds themselves to carry out the activity necessary for the third party to perform the promised performance. What is promised, by default, is the effort: the obligation consists in employing the adequate means, unless the result is guaranteed.
Step 5: And when the promisor is released
The same article closes it in five words: the third party’s performance releases the promisor. If the third party performs, whoever promised owes nothing further.
Step 6: Agreeing in favour of someone who did not sign
Article 1252 allows it and sets the condition: if the contract contains a stipulation in favour of a determined or determinable third party, that party may demand its performance if they communicate their acceptance to all the parties. And subsection (a) specifies that only the third party may accept the benefit, that it passes directly from the promisor to the accepting beneficiary, and that it reverts to the stipulator if the third party does not accept or if it is revoked.
Step 7: Until when the benefit may be revoked
Subsection (b) draws the line: the stipulator may revoke the benefit before the beneficiary communicates acceptance, and may also modify it if they reserved that power in the contract. On breach they may demand performance in the beneficiary’s name or rescind the contract; and if they revoked the benefit or the third party did not accept it, they may sue for performance to their own benefit or rescind.
Step 8: The three rules that close the article
Subsection (c): the promisor may raise against the third party the same defences arising from the contract that they have against the stipulator. (d): the third party’s power to accept and the stipulator’s power to revoke are not transmitted to heirs or creditors. And (e), in four words: the stipulation must be interpreted restrictively.
Where to do it
All of this happens between the parties and the third party, with no counter. If it is disputed whether the designation was communicated in time, whether the beneficiary accepted, or whether rescission lies, the Court of First Instance decides. The Code names no agency here.
How long it takes
What to do if something goes wrong
If what you want is to transfer a credit you already hold, that is not this chapter but the assignment of credits, which has its own guide. If the third party you promised something to is a policy beneficiary, that matter is governed by insurance legislation, which we did not read. This guide also does not explain the rules on representation Article 1250 excepts, nor the rescission rules Article 1252 invokes. The Code publishes no fee and no service term for these articles; the thirty days in Article 1250 are a statutory default period, yielding to whatever the parties agree. MiPRFácil does not represent anyone in court and gives no legal advice.
Common mistakes
- Wanting to designate a third party without having reserved that power on contracting.
- Trying it in a case where determining the subjects is mandatory at the time of contracting.
- Designating within the period and not communicating it: until the communication, the contract produces effects between the original parties.
- Counting on more than thirty days where the contract set no period.
- Promising a third party’s act and believing the result is owed: by default the adequate means are owed.
- Treating as accepted a benefit the third party did not communicate to all the parties.
- Revoking the benefit after the beneficiary already communicated acceptance.
- Counting on the power to accept or revoke passing to heirs or creditors: subsection (d) says it does not.
Frequently asked questions
Can I sign now and say later who the buyer will be?
Yes, if you reserved that power on contracting and the case is not one of the excepted ones. The designation must be made within the agreed period or, failing that, within thirty days, and communicated to the other contracting party.
I promised a third party would do something and they did not — am I liable?
Your obligation consists in employing the adequate means, unless you guaranteed the result. And if the third party performs, you are released.
The contract set a benefit in my favour and I did not sign — can I demand it?
You may demand its performance if you communicate your acceptance to all the parties. And note: the stipulator may revoke the benefit before you communicate that acceptance.
Can the promisor raise defences against me as beneficiary?
Yes. Subsection (c) of Article 1252 lets them raise against you the same defences arising from the contract that they have against the stipulator.
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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