Military and Veterans Code § 1202

The board shall, annually, at least fifteen days before the first day of the month in which the board of supervisors is required by law to levy the taxes required for county purposes, furnish to the board of supervisors and to the auditor estimates in writing of the minimum amount of money required for the payment of the principal of and interest upon all bonded indebtedness of the district; and also of the minimum amount of money required by the district for any other purposes.