California Code, Education Code - EDC § 46607

(a) Except as provided in subdivision (b) or (c), the average daily attendance for attendance of pupils from another district shall be credited to the district of attendance for purposes of determining state apportionments and the revenue limit pursuant to Section 42237 or 42238.

(b) For any district that would have a reduction of 25 percent or more in its federal grant pursuant to Public Law 81-874 if the average daily attendance of pupils residing within the district were credited to the district of attendance, then the average daily attendance resulting from an interdistrict attendance agreement shall be credited to the district of residence and the district of residence shall pay a tuition to the district of attendance no later than the next August 31, after the close of the fiscal year as follows:

(c) For any consortium of school districts operating an adult education and a regional occupational program serving four or more school districts, the school districts may agree to claim the unit of average daily attendance on the basis of the district of residence and pay such interdistrict tuition to the district of attendance as agreed to by the participating districts.