California Education Code Section 47663

(a) For a pupil of a charter school sponsored by a basic aid school district who resides in, and is otherwise eligible to attend, a school district other than a basic aid school district, the Superintendent of Public Instruction shall apportion to the sponsoring school district an amount equal to 70 percent of the revenue limit per unit of average daily attendance that would have been apportioned to the school district that the pupil resides in and would otherwise have been eligible to attend. (b) A district that loses basic aid status as a result of transferring property taxes to a charter school or schools pursuant to Section 47635 shall be eligible to receive a pro rata share of funding provided by subdivision (a), with the proration factor calculated as the ratio of the following: (1) The amount of property taxes that the district receives in excess of its total revenue limit guarantee, prior to any transfers made pursuant to Section 47635. (2) The total amount of property taxes transferred pursuant to Section 47635 to the charter school or schools that it sponsors. (c) The Superintendent of Public Instruction may not apportion funds for the attendance of a pupil in a charter school of a nonbasic aid school district who resides in, and is otherwise eligible to attend school in, a basic aid school district unless the pupil is subject to the exception set forth in paragraph (5) of subdivision (b) of Section 47635. (d) For purposes of this section, basic aid school district means a school district that does not receive from the state, for any fiscal year in which the subdivision is applied, an apportionment of state funds pursuant to subdivision (h) of Section 42238.