Oregon Revised Statutes Revenue and Taxation § 307.547

(2)(a) If the governing body determines that the applicant qualifies, the governing body shall certify to the assessor of the county where the real property is located, as set forth in ORS 307.512, that all or a portion of the property is exempt from taxation under the levy of the certifying governing body.

(b) Notwithstanding paragraph (a) of this subsection, the governing body may send the certification required under this subsection on or before the deadline specified in ORS 307.512, or as promptly as practicable after making the determination under subsection (1) of this section, whichever is later.