Utah law is quite clear on this issue. Unless the document specifically states interest is compounded, it is simple. Here is a blurb from case law on the issue, Mountain States Broadcasting Co. v Neale 783 P.2d 551
INTEREST
Mountain States next contends the trial court erred in awarding compound interest to NBA on the unpaid interest installments. See generally 45 Am.Jur.2d Interest and Usury § 76 (1969) (“Compound interest means interest on interest, in that accrued interest is added periodically to the principal, and interest is computed upon the new principal thus formed; it is to be distinguished from the mere allowance of interest on overdue installments of interest, which is not strictly compound interest.”). The court relied on the following provision in the promissory note as the basis for its award:
“This Note shall bear interest upon the unpaid principal balance hereof from the date hereof until paid, at a rate of ten percent (10%) per annum. Should interest not be paid when due, it shall thereafter bear like interest as the principal.”
In Utah, compound interest is not favored by the law. Watkins & Faber v. Whiteley, 592 P.2d 613, 616 (Utah 1979) (per curiam). The court’s award here can be affirmed only if we conclude the parties expressly agreed to compound interest by the terms of the above provision. In this regard, we observe that the note does not explicitly provide that interest on unpaid interest should be compounded monthly.(fn4) Instead, it provides that unpaid interest will bear interest “as the principal,” which bears simple interest. Therefore, we hold NBA is only entitled to simple interest at a rate of 10% per annum on the unpaid interest installments, and we remand to the trial court to recalculate the interest due.(fn5)
As I read this decision and others similarly worded in Utah it is clear that unless the document states “Compounded,” the Courts will not find it to be compounded.
