Indiana Code Title 8. Utilities and Transportation § 8-1-11.1-11

Sec. 11. Within sixty (60) days after the end of each calendar year, if there be at any time any bonds outstanding issued on account of said utility district, payable in whole or in part through a tax levy against the property in said utility district, said board of directors for utilities shall cause any surplus earnings arising from the operation of any such utility property, which are not pledged to secure the payment of any obligation of, or on account of said utility district, and which are not, in the opinion of such board of directors, necessary to provide against possible unfavorable results from operation, or to provide for contemplated betterments, extensions, improvements, or additions, to be paid over to the county treasurer and to be added to and become a part of said utility district bond fund, and to be used for the same purposes and in the same manner as funds derived from levy of taxes, as in this chapter hereinbefore provided.  In event there are no such utility district bonds at the time outstanding, any such surplus operating revenues not needed for the purposes aforesaid shall be paid over to and become a part of the general funds of such city.