Oregon Revised Statutes Revenue and Taxation § 311.807

(1) The county treasurer may maintain an account designated as the refund reserve account. The refund reserve account shall consist of the funds deposited by the treasurer under subsection (2) of this section and any funds deposited under ORS 311.160, plus interest earned thereon.

(3) The moneys in the refund reserve account shall first be used to pay refunds determined to be due under ORS 311.806.

(4) If the moneys in the refund reserve account are insufficient to pay refunds at any time, refunds shall be made out of the unsegregated tax collections account. If funds are not available in either the refund reserve account or the unsegregated tax collections account, the county governing body may delay payment of the refunds until such time as sufficient funds are available.

(5) If, at the end of the fiscal year, the balance in the refund reserve account exceeds the amount necessary to pay estimated refunds, the treasurer shall distribute the excess to the unsegregated tax collections account.

(6) The Department of Revenue shall provide by rule the method to be used to calculate anticipated annual refunds for the county.