105 ILCS 5/7-14A
There shall be no accounting made after a mere change in boundaries when no new district is created, except that those districts whose enrollment increases by 90% or more as a result of annexing territory detached from another district pursuant to this Article are eligible for supplementary State aid payments in accordance with Section 11E-135 of this Code. Eligible annexing districts shall apply to the State Board of Education for supplementary State aid payments by submitting enrollment figures for the year immediately preceding and the year immediately following the effective date of the boundary change for both the district gaining territory and the district losing territory. Copies of any intergovernmental agreements between the district gaining territory and the district losing territory detailing any transfer of fund balances and staff must also be submitted. In all instances of changes in boundaries, the district losing territory shall not count the average daily attendance of pupils living in the territory during the year preceding the effective date of the boundary change in its claim for reimbursement under Section 18-8.05 or 18-8.15 of this Code for the school year following the effective date of the change in boundaries and the district receiving the territory shall count the average daily attendance of pupils living in the territory during the year preceding the effective date of the boundary change in its claim for reimbursement under Section 18-8.05 or 18-8.15 of this Code for the school year following the effective date of the change in boundaries. The changes to this Section made by this amendatory Act of the 95th General Assembly are intended to be retroactive and applicable to any annexation taking effect on or after July 1, 2004.
105 ILCS 5/7-14A