Use Form 590, Withholding Exemption. Certificate, to certify an exemption from nonresident withholding.Download relevant Tax Collector forms. These include assessment removal, military property tax relief, Transient Occupancy Tax Exemption, and applicable forms. Exemption forms are due June 30th each year. Once forms are filed exemption is automatically renewed each year. Your claim of exemption may be filed with the Sheriff at any time during the wage garnishment period. Please Download PDF BOE-266 REV. Contra Costa LAFCO received an urgent request from CALAFCO, asking for members to send letters opposing both SB 1318 (Wolk) and AB 2032 (Linder). Please Download PDF BOE-266 REV.