Indiana Code Title 5. State and Local Administration § 5-13-9.3-5

(1) The principal of the fund consists of:

(2) To the extent that investment income earned on money in the fund during a calendar year exceeds five percent (5%) of the amount of the principal at the beginning of the calendar year, that excess investment income shall, for purposes of this chapter, be added to and be considered a part of the principal of the fund.

(3) Money may be expended from the fund only upon appropriation by the fiscal body of the political subdivision.  Money may be transferred from the fund to another fund of the political subdivision only if the fiscal body of the political subdivision authorizes the transfer by ordinance (in the case of a county or municipality) or by resolution (in the case of any other political subdivision).  However, an expenditure or transfer of any money that is part of the principal of the fund may be made only if the expenditure or transfer is approved:

(4) All money in the fund that is in a deposit account and not in some other form of investment shall be deposited in one (1) or more designated depositories of the political subdivision in the same manner as other public funds of the political subdivision are deposited under IC 5-13-9.