SIGA-AN - v - VILLANUEVA

G.R. 173227, January 20, 2009 CHICO-NAZARIO, J.

Facts: 
1.     In 1998, respondent Alicia Villanueva filed a complaint for sum of money against petitioner Sebastian Siga-an before the Las Pinas City, RTC.  she was a businesswoman engaged in supplying office materials and equipments to the Philippine Navy Office (PNO), while petitioner was a military officer and comptroller of the PNO.
2.     Respondent claimed that in 1992, petitioner approached her inside the PNO and offered to loan her the amount of P540,000.00. Since she needed capital for her business transactions with the PNO, she accepted. The loan agreement was not reduced in writing. Also, there was no stipulation as to the payment of interest for the loan.
3.     In August 1993, respondent issued a check worth P500,000.00 to petitioner as partial payment of the loan. In October 1993, she issued another check in the amount of P200,000.00 to petitioner as payment of the remaining balance of the loan. 
4.     Petitioner told her that since she paid a total amount of P700,000.00 for the P540,000.00 worth of loan, the excess amount of P160,000.00 would be applied as interest for the loan. Not satisfied with the amount applied as interest, petitioner threatened to block or disapprove her transactions with the PNO if she would not comply with his demand for additional payments. respondent conceded. 
5.     resondent asked petitioner for receipt for the payments but petitioner told her that it was not necessary.
6.     respondent consulted a lawyer regarding the propriety of paying interest on the loan despite absence of agreement to that effect. Her lawyer told her that petitioner could not validly collect interest on the loan because there was no agreement between her and petitioner regarding payment of interest. she sent a demand letter to petitioner asking for the return of the excess amount of P660,000.00.
7.      Petitioner, despite receipt of the demand letter, ignored her claim for reimbursement.
8.     Respondent prayed that the RTC render judgment ordering petitioner to pay respondent.
9.     In his answer to the complaint, petitioner denied that he offered a loan to respondent. He averred that in 1992, respondent approached and asked him if he could grant her a loan, as she needed money to finance her business venture with the PNO.
10.  Upon his approval of respondents request for restructuring of the loan, respondent executed a promissory note wherein she admitted having borrowed an amount of P1,240,000.00, inclusive of interest. Petitioner insisted that there was no overpayment. 
11.  RTC held that respondent made an overpayment of her loan obligation to petitioner and that the latter should refund the excess amount to the former. 
12.  Petitioner appealed to the Court of Appeals. It affirmed in toto the RTC Decision.
13.  Petitioner filed a motion for reconsideration of the appellate courts decision but was denied.
14.   Hence, petitioner lodged the instant petition.

Issues:
1.     Whether or not the RTC and CA erred in ruling that no interest was due to petitioner.
2.     Whether or not the RTC and CA erred in applying the principle of solutio indebiti.

Ruling:
1.     No. No interest was due to petitioner.
Monetary interest
Compensatory interest
Interest is a compensation fixed by the parties for the use or forbearance of money. 
Interest may also be imposed by law or by courts as penalty or indemnity for damages. The right to interest arises only by virtue of a contract or by virtue of damages for delay or failure to pay the principal loan on which interest is demanded.

-       Article 1956 of the Civil Code refers to monetary interest, mandates that no interest shall be due unless it has been expressly stipulated in writing. allowed only if:
 (1) there was an express stipulation for the payment of interest; and
(2) the agreement for the payment of interest was reduced in writing. 
-       collection of interest without any stipulation therefor in writing is prohibited by law.
-       Petitioner presented a handwritten promissory note however, it was petitioner who made a promissory note and respondent was told to copy it in her own handwriting; respondent did not really consent to the payment of interest for the loan. it cannot be gainfully said that such promissory note pertains to an express stipulation of interest or written agreement of interest on the loan between petitioner and respondent.
-       RTC did not make a ruling therein that petitioner and respondent agreed on the payment of interest at the rate of 7% for the loan. The RTC clearly stated that although petitioner and respondent entered into a valid oral contract of loan amounting to P540,000.00, they, nonetheless, never intended the payment of interest thereon.
-       There are instances in which an interest may be imposed even in the absence of express stipulation, verbal or written, regarding payment of interest.
Article 2209 of the Civil Code - if the obligation consists in the payment of a sum of money, and the debtor incurs delay, a legal interest of 12% per annum may be imposed as indemnity for damages if no stipulation on the payment of interest was agreed upon. 
Article 2212 of the Civil Code - interest due shall earn legal interest from the time it is judicially demanded, although the obligation may be silent on this point.
-       the interest under these two instances may be imposed only as a penalty or damages for breach of contractual obligationsIt cannot be charged as a compensation for the use or forbearance of money
-       the two instances apply only to compensatory interest and not to monetary interest. The case at bar involves petitioners claim for monetary interest.

2.     No. Principle of solution indebiti properly applied.
-       Article 1960 of the Civil Code - if the borrower of loan pays interest when there has been no stipulation therefor, the provisions of the Civil Code concerning solution indebiti shall be applied. 
-       Article 2154 of the Civil Code - if something is received when there is no right to demand it, and it was unduly delivered through mistake, the obligation to return it arises. 
-       a creditor-debtor relationship is created under a quasi-contract whereby the payor becomes the creditor who then has the right to demand the return of payment made by mistake, and the person who has no right to receive such payment becomes obligated to return the same. 
-       no one shall enrich himself unjustly at the expense of another.
-        The principle of solutio indebiti applies where:
(1) a payment is made when there exists no binding relation between the payor, who has no duty to pay, and the person who received the payment; and
(2) the payment is made through mistake, and not through liberality or some other cause. We have held that the principle of solutio indebiti applies in case of erroneous payment of undue interest.
-       It was duly established that respondent paid interest to petitioner.  Respondent was under no duty to make such payment because there was no express stipulation in writing to that effect. There was no binding relation between petitioner and respondent as regards the payment of interest. The payment was clearly a mistake. Since petitioner received something when there was no right to demand it, he has an obligation to return it.

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