35 ILCS 200/16-15

Each county clerk shall compile final adjustments made during the preceding calendar year by the State Property Tax Appeal Board to the aggregate assessed value of a school district for which such adjustments are greater than $250,000 or 2% of the aggregate assessed value of a school district, whichever is less, and report that information to the Department. By July 1 annually, the Department shall transmit the adjusted assessments reported since the prior July 1 to the Illinois State Board of Education for purposes of calculating the amount of State aid to be apportioned to the various school districts under the School Code.