Indiana Code Title 20. Education § 20-43-4-2

Sec. 2. (a) Subject to section 3.7 of this chapter, a school corporation's ADM is the number of eligible pupils enrolled in:

on the fall count day of ADM established under section 3 of this chapter and, if applicable, as subsequently adjusted under section 3.5 of this chapter.

(b) Subject to section 3.7 of this chapter, a school corporation shall determine the number of eligible pupils enrolled in:

on the day fixed in February by the state board for a spring count of students under section 3 of this chapter and, if applicable, as subsequently adjusted under section 3.5 of this chapter.

(c) Each school corporation shall, before April 1 of each year, provide to the department an estimate of the school corporation's ADM that will result from the following fall count of eligible pupils.  The department may update and adjust the estimate as determined appropriate by the department.  In each odd-numbered year, the department shall provide the updated and adjusted estimate of the school corporation's ADM to the legislative services agency before April 10 of that year.  Upon request, the department shall provide a school corporation with an estimate of the school corporation's ADM.

(d) A new charter school shall submit an enrollment estimate to the department before April 1 of the year the new charter school will be open for enrollment.  The department shall use the new charter school's enrollment estimate as the basis for the new charter school's distribution beginning in July and until actual ADM is available, subject to section 9 of this chapter.  However, if the new charter school's enrollment estimate is greater than eighty percent (80%) of the new charter school's authorized enrollment cap, the department may use that enrollment estimate if the department has requested and reviewed other enrollment data that support that enrollment estimate.  However, if the enrollment data requested and reviewed by the department does not support the enrollment estimate submitted by the new charter school, the department shall determine the estimated ADM based on the enrollment data requested and reviewed by the department.  In each odd-numbered year, the department shall provide the new charter school's estimated ADM to the legislative services agency before April 10 of that year.