California Code, Education Code - EDC § 42124

The budget may also contain an amount to be known as the general reserve in such sum as the governing board may deem sufficient, for the next succeeding fiscal year, to meet the cash requirements to which the district's credit may be legally extended for that portion of said next succeeding fiscal year until adequate proceeds of the taxes levied for, or apportionment of state funds made to, the district during such succeeding fiscal year are available to the district.