Iowa Code § 298A.10
A debt service fund must be established in any school corporation which issues bonds or other authorized indebtedness. The debt service fund shall be used to pay interest as it becomes due and the amount necessary to pay the principal when due on bonds or other authorized indebtedness issued by the district, and to make payments required under a loan, lease-purchase agreement, or other evidence of indebtedness authorized by this Code. Moneys available to service this debt and received from other sources shall be transferred to the debt service fund and the payment of the debt shall be made from this fund. Funds remaining in the debt service fund after payment of all outstanding debt in accordance with the original purpose of the indebtedness may be transferred by board resolution to the physical plant and equipment levy fund or transferred to the general fund in accordance with section 278.1, subsection 1, paragraph "e".
Iowa Code § 298A.10
94 Acts, ch 1029, §10