105 ILCS 5/18-15
All bonds, notes, mortgages, moneys and effects which have accrued or may accrue from the sale of Section 16 of the common school lands of any township, or from the sale of any real estate or other property taken on any judgment or for any debt due to the principal of any township fund, and all other funds which have been or may be carried to and made part of the principal of any township fund, shall constitute the principal of the township fund; and no part thereof shall be distributed or expended for any purpose, except upon liquidation of the fund but shall be loaned and held to use, rent or profit, as provided by law. The interest, rents, issues and profits arising and accruing from the principal of any township fund shall be used in the manner and at the times provided by this Act.
105 ILCS 5/18-15