In short
Where someone has several debts of the same nature in favour of a single creditor, the Code lets the debtor choose: they may declare, at the time of paying, to which of them the payment is to be applied. But if they accept from the creditor a receipt in which the application is made, they cannot complain against it, unless a cause invalidating it intervened. One rule governs that freedom: if the debt produces interest, the payment cannot be applied to the principal while the interest is not covered. And where the payment cannot be applied under the preceding rules and the debtor does not make the application after being required to, the debt deemed paid is the most onerous to the debtor among those already due; if they are of equal nature and burden, the payment is applied to all, pro rata. The chapter closes with the paperwork: whoever makes a partial payment has the right to require the corresponding receipt and to have the reservations they consider pertinent included in it, and where the payment extinguishes the obligation in full, the payer has the right to require delivery of the document in which the obligation is recorded. And with two presumptions in the payer’s favour: a receipt for principal with no reservation as to interest presumes the interest paid, and a receipt for the last instalment with no reservations presumes the earlier ones paid.
What is it?
It is Section Five of Chapter I of Title II of Book Four of the Civil Code of 2020, Articles 1126 to 1130, closing the chapter on payment. It settles which of several debts a payment goes to and what paperwork the payer may require.
Who can do it?
Any debtor with several debts of the same nature in favour of a single creditor, and anyone making a partial or full payment of an obligation.
Requirements
- That there be several debts of the same nature and in favour of a single creditor: the two conditions in Article 1126.Verified against the official source
- Declaring the application at the time of paying, not afterwards.Verified against the official source
- Covering the interest first if the debt produces it: until then the payment cannot be applied to the principal.Verified against the official source
Documents you need
Cost
Step by step
Step 1: The debtor chooses, and at the moment of paying
Article 1126 gives the first word to the payer: a person with several debts of the same nature in favour of a single creditor may declare, at the time of paying, to which of them the payment is to be applied. The moment matters: it is when paying, not when the statement arrives.
Step 2: If you take the receipt, you take the application
The same article closes the back door: if the debtor accepts from the creditor a receipt in which the application of the payment is made, they cannot complain against it, unless a cause invalidating it intervened. It is worth reading the receipt before filing it away.
Step 3: Interest goes first
Article 1127 says it in one line and limits the debtor’s choice: if the debt produces interest, the payment cannot be applied to the principal while the interest is not covered. That is why an instalment may not reduce the principal at all.
Step 4: If nobody applies it
Article 1128 steps in where the payment cannot be applied under the preceding rules and the debtor does not apply it after being required to: then the debt deemed paid is the most onerous to the debtor, among those already due. Only among those due, and the most onerous for them, not the most convenient for the creditor.
Step 5: And if they weigh the same, it is shared
The same article closes: if these are of equal nature and burden, the payment is applied to all, pro rata. Nobody decides on a whim when the debts are tied.
Step 6: The receipt for an instalment is a right
Article 1129 recognizes it: a person making a partial payment has the right to require the corresponding receipt from the creditor, and may also require that the reservations they consider pertinent be included in the receipt. That second part is what stops a badly worded receipt from closing an argument on you.
Step 7: And when you finish paying, the document comes back
The second paragraph of Article 1129: where the payment extinguishes the obligation in full, the payer has the right to require delivery of the document in which the obligation is recorded. Not a payoff letter: the document.
Step 8: Two presumptions that play in your favour
Article 1130 closes the chapter with both. If the creditor gives a receipt for payment of the principal without any reservation as to the interest, the interest is presumed paid. And if the creditor made no reservations in the receipt for the last instalment of a debt, the earlier instalments are presumed paid. They are presumptions: they can be contested, but whoever contests them carries the burden.
Where to do it
The application is made to the creditor themselves, at the moment of paying, and the receipt is requested from them. Where there is disagreement over which debt a payment went to, the Court of First Instance decides. The Code names no agency here.
How long it takes
What to do if something goes wrong
If your problem is with a collection agency or with what your credit report shows, there are separate guides for that. If you are looking for the amount of the legal interest, this guide does not carry it either: the Code names it and does not fix it, and we did not read the instrument that does. If your question is whether you can be forced to accept an instalment, see the guide on the requirements of payment. This guide does not explain the special consumer or lending statutes that may impose their own application order or their own receipt duties: we did not read them. 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
- Letting the moment of payment pass without declaring which debt the instalment goes to: the choice is at the time of paying.
- Filing away unread a receipt that already applies the payment: accepting it closes the claim absent a cause invalidating it.
- Expecting an instalment to reduce the principal where the debt produces interest: interest is covered first.
- Believing the creditor may apply it to whichever debt they like where the debtor is silent: the debt deemed paid is the most onerous to the debtor among those due.
- Applying the default rule to debts that have not yet fallen due.
- Not asking for a receipt for a partial payment: it is the payer’s right.
- Accepting a receipt without the reservations that matter to you, when you can require them to be included.
- Finishing the payments and not requiring delivery of the document in which the obligation is recorded.
Frequently asked questions
I have three debts with one creditor — which one does my payment go to?
To the one you declare at the time of paying, if they are of the same nature. If you do not declare it and, after being required to, still do not, the debt deemed paid is the most onerous to you among those due; if they weigh the same, pro rata among them all.
Why did my instalment not reduce the principal?
Because Article 1127 says that, if the debt produces interest, the payment cannot be applied to the principal while the interest is not covered.
Am I entitled to a receipt for a partial payment?
Yes, and you may also require that the reservations you consider pertinent be included in the receipt. Article 1129 says so.
They gave me a receipt for the principal without mentioning interest — do I still owe it?
Article 1130 presumes it paid: if the creditor gives a receipt for payment of the principal without any reservation as to the interest, the interest is presumed paid. It is a presumption, not an absolute certainty.
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
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.
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