To transfer the interest earned from any moneys of the district in the respective fund of the district that is most in need of such interest income, as determined by the board. This Section does not apply to any interest earned which has been earmarked or restricted by the board for a designated purpose. This Section does not apply to any interest earned on any funds for purposes of Illinois Municipal Retirement under the Pension Code, Tort Immunity under the Local Governmental and Governmental Employees Tort Immunity Act, Fire Prevention, Safety, Energy Conservation and School Security Purposes under Section 17-2.11, and Capital Improvements under Section 17-2.3. Interest earned on these exempted funds shall be used only for the purposes authorized for the respective exempted funds from which the interest earnings were derived.
     Any high school district whose territory is in 2 counties and that is eligible for Section 8002 Federal Impact Aid may make a one-time declaration as to interest income (earnings on investments) not previously declared as such from 1998 through 2011 in the debt service fund, declaring said moneys as interest earnings on or before June 30, 2016. Any such earnings income so declared shall thereafter, for purposes of this Code, be considered interest earnings and shall be subject to all provisions of this Code related thereto.