1. In computing the amount of state aid a school district is entitled to receive for the minimum school term only under section 163.031, a school district may use an estimate of the weighted average daily attendance for the current year, or the weighted average daily attendance for the immediately preceding year or the weighted average daily attendance for the second preceding school year, whichever is greater. Beginning with the 2006-07 school year, the summer school attendance included in the average daily attendance as defined in subdivision (2) of section 163.011 shall include only the attendance hours of pupils that attend summer school in the current year. Beginning with the 2004-05 school year, when a district’s official calendar for the current year contributes to a more than ten percent reduction in the average daily attendance for kindergarten compared to the immediately preceding year, the payment attributable to kindergarten shall include only the current year kindergarten average daily attendance. Any error made in the apportionment of state aid because of a difference between the actual weighted average daily attendance and the estimated weighted average daily attendance shall be corrected as provided in section 163.091, except that if the amount paid to a district estimating weighted average daily attendance exceeds the amount to which the district was actually entitled by more than five percent, interest at the rate of six percent shall be charged on the excess and shall be added to the amount to be deducted from the district’s apportionment the next succeeding year.

2. Notwithstanding the provisions of subsection 1 of this section or any other provision of law, the state board of education shall make an adjustment for the immediately preceding year for any increase in the actual weighted average daily attendance above the number on which the state aid in section 163.031 was calculated. Said adjustment shall be made in the manner providing for correction of errors under subsection 1 of this section.

3. Any error made in the apportionment of state aid because of a difference between the actual equalized assessed valuation for the current year and the estimated equalized assessed valuation for the current year shall be corrected as provided in section 163.091, except that if the amount paid to a district estimating current equalized assessed valuation exceeds the amount to which the district was actually entitled, interest at the rate of six percent shall be charged on the excess and shall be added to the amount to be deducted from the district’s apportionment the next succeeding year.

4. For the purposes of distribution of state school aid pursuant to section 163.031, a school district with ten percent or more of its assessed valuation that is owned by one person or corporation as commercial or personal property who is delinquent in a property tax payment may elect, after receiving notice from the county clerk on or before March fifteenth that more than ten percent of its current taxes due the preceding December thirty-first by a single property owner are delinquent, to use in the local effort calculation of the state aid formula the district’s equalized assessed valuation for the preceding year or the actual assessed valuation of the year for which the taxes are delinquent less the assessed valuation of property for which the current year’s property tax is delinquent. To qualify for use of the actual assessed valuation of the year for which the taxes are delinquent less the assessed valuation of property for which the current year’s property tax is delinquent, a district must notify the department of elementary and secondary education on or before April first, except in the year enacted, of the current year amount of delinquent taxes, the assessed valuation of such property for which delinquent taxes are owed and the total assessed valuation of the district for the year in which the taxes were due but not paid. Any district giving such notice to the department of elementary and secondary education shall present verification of the accuracy of such notice obtained from the clerk of the county levying delinquent taxes. When any of the delinquent taxes identified by such notice are paid during a four-year period following the due date, the county clerk shall give notice to the district and the department of elementary and secondary education, and state aid paid to the district shall be reduced by an amount equal to the delinquent taxes received plus interest. The reduction in state aid shall occur over a period not to exceed five years and the interest rate on excess state aid not refunded shall be six percent annually.

5. If a district receives state aid based on equalized assessed valuation as determined by subsection 4 of this section and if prior to such notice the district was paid state aid pursuant to section 163.031, the amount of state aid paid during the year of such notice and the first year following shall equal the sum of state aid paid pursuant to section 163.031 plus the difference between the state aid amount being paid after such notice minus the amount of state aid the district would have received pursuant to section 163.031 before such notice. To be eligible to receive state aid based on this provision the district must levy during the first year following such notice at least the maximum levy permitted school districts by Article X, Section 11(b) of the Missouri Constitution and have a voluntary rollback of its tax rate which is no greater than one cent per one hundred dollars assessed valuation.