In short
Article 1528 of the Civil Code of 2020 opens a little-known and very useful chapter: by the unilateral declaration of will, whoever issues it is bound to perform a determined prestation in favour of another person, provided the declarant has capacity to bind themselves and if the prestation is not contrary to law, morals or public order. It is an obligation with no contract and no acceptance: it is born of one person’s declaration alone. Article 1529 applies it to the most frequent case: the person who by public announcements unilaterally promises a pecuniary reward or a distinction to whoever finds themselves in a certain situation, performs a determined act or meets determined requirements, is bound by their promise from the moment it reaches the public’s knowledge. Note when the obligation is born: from when the announcement reaches the public, not from when someone acts in reliance on it. Article 1530 says who may collect: anyone who is in the foreseen situation, meets the requirements or has performed the act contemplated may demand the prestation offered. And Article 1531 resolves ties, with two rules worth reading separately. The first: if several persons separately evidence compliance, the reward corresponds to whoever first notifies the promisor reliably of it. The second, for where the act is performed by more than one person: the reward goes to whoever is first in the situation, performs the act or meets the requirements; if performance is simultaneous, the reward is split in equal parts; and if the reward is indivisible by nature, or if by the promise’s terms only one person may receive it, it is decided by lot. The first paragraph rewards whoever notifies first and the second whoever acts first; the Code carries both and does not explain how they relate.
What is it?
They are Articles 1528 to 1531 of the Civil Code of 2020: the obligation born of a unilateral declaration, when a publicly announced reward binds, who may demand it and how ties are resolved.
Who can do it?
Whoever publicly promises a reward and whoever is in the situation, performs the act or meets the requirements announced, under the Puerto Rico Civil Code.
Requirements
- That the declarant have capacity to bind themselves and that the prestation not be contrary to law, morals or public order.Verified against the official source
- That the promise be made by public announcements and offer a pecuniary reward or a distinction.Verified against the official source
- The promise binds from the moment it reaches the public’s knowledge.Verified against the official source
- It may be demanded by anyone in the foreseen situation, who meets the requirements or has performed the act contemplated.Verified against the official source
Documents you need
Cost
Step by step
Step 1: An obligation with no contract
Article 1528: by the unilateral declaration of will, whoever issues it is bound to perform a determined prestation in favour of another person. No acceptance and no contract are needed: the obligation is born of the declaration.
Step 2: With two conditions
The same article: provided the declarant has capacity to bind themselves and if the prestation is not contrary to law, morals or public order.
Step 3: An announced reward binds
Article 1529: whoever by public announcements unilaterally promises a pecuniary reward or a distinction is bound by their promise. The Code admits both forms: money or a distinction.
Step 4: From when it binds
The same article fixes it: from the moment it reaches the public’s knowledge. Not from when someone sees it, nor from when someone acts: from when it reaches the public.
Step 5: To whom it may be promised
Article 1529 names three cases: whoever finds themselves in a certain situation, performs a determined act or meets determined requirements. All three count, and the person need not have been identified beforehand.
Step 6: Anyone who complies may demand it
Article 1530: anyone in the foreseen situation, who meets the requirements or has performed the act contemplated may demand the prestation offered. The word is "anyone".
Step 7: If several evidence separately: whoever notifies first wins
First paragraph of 1531: if several persons separately evidence compliance, the reward corresponds to whoever first notifies the promisor reliably of it. Notifying, and notifying reliably, decides.
Step 8: If several perform the act: whoever acts first wins
Subsection (a) of the second paragraph: the person who is first in the foreseen situation, performs the act or meets the requirements. Here the measure is the action, not the notice.
Step 9: Two criteria the Code does not reconcile
The first paragraph rewards whoever notifies first; subsection (a) of the second, whoever acts first. The Code carries both and does not say how they relate. This guide prints both and merges neither.
Step 10: If it was simultaneous: equal shares
Subsection (b): if performance is simultaneous, or several persons meet the condition at the same time, the reward is split in equal parts.
Step 11: And if it cannot be split: a draw
Subsection (c): if the reward is indivisible by nature, or if by the promise’s terms only one person may receive it, it is decided by lot. The Code does not say who runs it or how, and this guide does not describe it.
Step 12: What these articles do not carry
They do not define what makes a notification reliable, do not say what counts as a public announcement or through which channels, fix no amount, describe no draw and set no claiming period. None of that is here.
Step 13: What this guide does not cover
How long the promise lasts, how it is revoked, the contest prize and the extension of these rules to other unilateral declarations are in the next four articles, with their own guide.
Where to do it
The claim runs against whoever made the promise; the Code names no agency for this chapter. It is decided by the Court of First Instance. The draw of Article 1531(c) is ordered by the Code without describing who runs it.
How long it takes
What to do if something goes wrong
If the reward is offered by a government agency under its own programme — for information on fugitives or on government fraud, say — that programme has its own rules and separate guides on this site. If what you want to know is whether the promise is still in force or can be withdrawn, that is in the following articles, with their own guide. If there was negotiation and agreement, it is not a unilateral declaration but a contract. These articles do not define reliable notice, do not say which channel counts as a public announcement, and set no period. MiPRFácil does not represent anyone in court and gives no legal advice.
Common mistakes
- Believing the promise binds only if someone accepted it: it is born of the unilateral declaration.
- Counting the obligation from when someone acts: Article 1529 counts it from when it reaches the public’s knowledge.
- Complying and not notifying: the first paragraph of Article 1531 rewards whoever notifies first, reliably.
- Not recording the date of the notice to the promisor.
- Assuming one must be identified beforehand: 1530 says "anyone".
- Forgetting the reward may be pecuniary or a distinction.
- Expecting a proportional split where performance was simultaneous: the Code splits in equal parts.
- Thinking an indivisible reward is split: the Code decides it by lot.
- Confusing this figure with government agency reward programmes, which have their own rules.
Frequently asked questions
A reward was offered in an announcement. Are they bound?
Article 1529 says whoever by public announcements unilaterally promises a pecuniary reward or a distinction is bound by their promise from the moment it reaches the public’s knowledge.
I did what they asked. Can I demand the reward?
Article 1530 says anyone in the foreseen situation, who meets the requirements or has performed the act contemplated may demand the prestation offered.
Several of us complied. Who collects?
Article 1531 carries two rules: if several evidence separately, whoever first notifies the promisor reliably collects; and if several performed the act, whoever performed it first collects, with an equal split if it was simultaneous.
And if the reward cannot be divided?
Article 1531(c) says that if the reward is indivisible by nature, or if by the promise’s terms only one person may receive it, it is decided by lot.
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 10, 2026
MiPRFácil is an independent informational website and is not affiliated with, endorsed by, or operated by the Government of Puerto Rico or any government agency.
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