In short
Four articles close the transaction chapter and are the ones worth reading before signing. Article 1501 settles a frequent scare: arithmetic errors do not cause the nullity of the transaction, but the parties may obtain the corresponding rectification. A bad sum does not topple the agreement; it is corrected. Article 1502 marks what may not be settled, and its last limb is the widest and least noticed: the contract of transaction may not include clauses related to mandatory laws or non-waivable rights, to future support, or to any relationship or right that is not strictly patrimonial. Future support is expressly named; and anything not strictly patrimonial is out. Article 1503 fixes the form with a hard consequence: the transaction must be recorded in a writing signed by the parties or in a resolution or judgement issued by the court; if it concerns rights constituted by public deed, that formality is required; and failure to observe these rules makes it null. Its second paragraph says that payment in full settlement has the effects the law establishes, without saying which law: we read none on that and this guide does not describe those effects. And Article 1504 lists five grounds of invalidity in addition to those invalidating every juridical act: where the situation giving rise to it does not correspond to the real facts and the litigation or uncertainty would not have appeared had the real situation been known; where it includes totally or partially non-existent titles; where it includes titles over which it is unknown that a better one exists; where it includes aspects over which it is unknown that they are already resolved by a final judgement; or where the effectiveness of a prestation is uncertain.
What is it?
They are Articles 1501 to 1504 of the Civil Code of 2020: what happens with an arithmetic error, what may not be settled, in what form the settlement must be recorded, and when it is invalid.
Who can do it?
People about to sign or who already signed a transaction governed by the Puerto Rico Civil Code.
Requirements
- The transaction must be recorded in a writing signed by the parties or in a resolution or judgement issued by the court.Verified against the official source
- If it concerns rights constituted by public deed, that same formality is required.Verified against the official source
- It may not include clauses on mandatory laws, non-waivable rights, future support, or relationships or rights that are not strictly patrimonial.Verified against the official source
- Arithmetic errors do not cause nullity, but the parties may obtain the corresponding rectification.Verified against the official source
Documents you need
Cost
Step by step
Step 1: A bad sum does not topple the agreement
Article 1501: arithmetic errors do not cause the nullity of the transaction, but the parties may obtain the corresponding rectification. It is corrected, not voided. The Code does not say who rectifies or how, and this guide does not describe it.
Step 2: What may not be settled: mandatory laws and non-waivable rights
Article 1502, first limb: it may not include clauses related to mandatory laws or non-waivable rights. The Code defines neither category here, and this guide does not fill them with content.
Step 3: Nor future support
The same article names it expressly: nor with future support. It is the article’s most concrete prohibition and the one most worth knowing before signing a family agreement.
Step 4: Nor anything not strictly patrimonial
Closing of 1502: nor with any relationship or right that is not strictly patrimonial. It is the article’s widest limb, and the one that leaves most agreements out without the parties noticing.
Step 5: The form: a signed writing, or a court ruling
Article 1503: the transaction must be recorded in a writing signed by the parties or in a resolution or judgement issued by the court. Two routes, and a spoken agreement is neither.
Step 6: And a public deed if the right had one
The same article: if it concerns rights constituted by public deed, that formality is required. The transaction’s form follows that of the right being settled.
Step 7: And the consequence of not complying
The last sentence of the first paragraph: failure to observe these rules makes it null. It is not an evidentiary requirement; it is one of validity.
Step 8: Payment in full settlement: the Code refers out without saying where
Second paragraph of 1503: payment in full settlement has the effects the law establishes. The article does not say which law that is. We did not read it for this guide, so no such effect is described here and no norm is named.
Step 9: Five grounds of invalidity, on top of the general ones
Article 1504: besides the causes that invalidate every juridical act. That opening matters: the five that follow add to the general ones, which live elsewhere in the Code and are not reproduced here.
Step 10: The first: the facts were not what they thought
Subsection (a): where the situation giving rise to it does not correspond to the real facts and the litigation or uncertainty would not have appeared had the real situation been known. Two joined conditions: different facts, and that with the real ones there would have been no dispute.
Step 11: Three grounds that look at the titles
Subsections (b), (c) and (d): where it includes totally or partially non-existent titles; where it includes titles over which it is unknown that a better one exists; and where it includes aspects over which it is unknown that they are already resolved by a final judgement. All three penalise settling over what was not known.
Step 12: And the fifth: an uncertain prestation
Subsection (e): where the effectiveness of a prestation is uncertain. The Code puts it that way, with no further precision, and this guide adds no criteria.
Step 13: What these articles do not carry
They do not define future support, non-waivable rights or mandatory laws; do not say who rectifies the arithmetic error or how; set no period to seek the rectification or to attack the transaction; and do not describe the effects of payment in full settlement. None of that is here.
Where to do it
The agreement is signed between the parties, or recorded in a resolution or judgement issued by the court. If it concerns rights constituted by public deed, a notary executes it. Disputes over validity or rectification are decided by the Court of First Instance. The Code names no agency for this chapter.
How long it takes
What to do if something goes wrong
If you are after what a transaction is and what effects it produces, that is in Articles 1497 to 1500, with its own guide. If your agreement touches future support payments, Article 1502 expressly forbids it and there are separate guides on support. If the matter is not strictly patrimonial, it is out too. These articles do not define future support or non-waivable rights, do not say how an arithmetic error is rectified, set no periods, and do not describe the effects of payment in full settlement. MiPRFácil does not represent anyone in court and gives no legal advice.
Common mistakes
- Closing a transaction verbally: Article 1503 makes it null if not in writing or in a court ruling.
- Forgetting the public deed where the settled right was constituted with that formality.
- Including clauses on future support, which Article 1502 expressly forbids.
- Settling something that is not strictly patrimonial.
- Including non-waivable rights or matters governed by mandatory laws.
- Believing an arithmetic error voids the whole agreement: it is rectified.
- Signing over titles without checking they exist and that no better one exists.
- Settling aspects already resolved by a final judgement without knowing it.
- Forgetting that the five grounds of Article 1504 add to the general ones for any juridical act.
Frequently asked questions
The agreement has a bad sum. Does it fall?
No. Article 1501 says arithmetic errors do not cause the nullity of the transaction, but the parties may obtain the corresponding rectification.
Can I waive future support in an agreement?
Article 1502 says the contract of transaction may not include clauses related to future support.
Is a transaction agreed only verbally valid?
No. Article 1503 requires it to be recorded in a writing signed by the parties or in a court resolution or judgement, and says failure to observe those rules makes it null.
We settled something already resolved by judgement. Is it valid?
Article 1504(d) declares the transaction invalid where it includes aspects over which it is unknown that they are already resolved by a final judgement.
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.
MiPRFácil does not submit applications on your behalf.
Was this guide helpful?
Did you find out-of-date information?
Settling a dispute: the agreement has the effects of res judicata
Article 1500 gives the settlement the effects of res judicata, and 1499 orders it interpreted restrictively.
Which deals must be put in a document, and the one the law forbids
Five cases must appear in a public or private instrument for evidentiary purposes. And a contract on a future inheritance is forbidden.
Who owes support to whom in your family
Spouses, ascendants, descendants and siblings owe each other, in that order and with rules of their own.
What you sign has the force of law: the limits of freedom to contract
You may contract or not, and with whom you like, but not abusively. And what the contract omits is filled by law, usage and good faith.
The contract you could not negotiate: seven clauses that are annullable
If one party drafted the form, it is read against them. And the Code marks seven clauses as especially annullable.
What an obligation is and where it comes from
Six sources, and the list stays open. Whoever performs knowing they were not bound cannot demand it back.