RCW 52.16.070

Except as authorized by the issuance and sale of general obligation bonds, the creation of local improvements districts, and the issuance of local improvement bonds and warrants of the fire protection district, the board of fire commissioners may not incur expenses or other financial obligations payable in any year in excess of the aggregate amount of taxes levied for that year, revenues derived from all other sources, and the cash balances on hand in the expense and reserve funds of the district on the first day of that year. In the event that there are any unpaid warrants drawn on any district funds for expenses and obligations incurred and outstanding at the end of any calendar year, the warrants may be paid from taxes collected in the subsequent year or years and from other income.