Oregon Revised Statutes Revenue and Taxation § 311.821

(1) Whenever in any year the boundaries of a taxing district have been reduced by proceedings occurring after the date provided in ORS 308.225, and whenever such changes in boundaries were not disregarded by the county assessor as required by ORS 308.225, and as a result thereof taxes have been levied and collected upon the reduced territory of such district, which taxes were not levied and extended upon the territory detached from such district, the county governing body shall refund out of the unsegregated tax collections account to the taxpayers of the territory upon which the levy was imposed and the taxes collected, the proportionate amount of money in excess of the amount that would have been collected from the territory comprising the entire district had the levy been uniform throughout the district. A written claim for refund of such collection shall be filed with the county governing body within six years from the assessment date for the fiscal year for which the taxes were collected.

(2) Whenever in any year the boundaries of a taxing district have been reduced by boundary changes pursuant to law after the date provided in ORS 308.225, and such changes in boundaries have been disregarded by the county assessor as required by ORS 308.225, and as a result thereof taxes were levied upon property within such withdrawn area by such district and also for the same tax year by another taxing district providing the same service or services, subjecting such property to double taxation for any tax year, the county governing body shall refund out of the unsegregated tax collections account to the taxpayers of the territory upon which the levy was imposed and the tax was collected the proportionate amount of money in excess of the amount that would have been paid by such taxpayers had the withdrawal been recognized by the assessor as effective for the tax year involved; provided, all such property shall remain liable for indebtedness incurred prior to the boundary change as otherwise required by law. A written claim for refund of such tax collection shall be filed with the county governing body within two years from the assessment date for the fiscal year for which the taxes were collected.

(3) If the claim is in proper form, the county governing body shall take action by resolution spread upon its journal, and repayments shall be made by orders drawn on the county treasurer for the several amounts and issued to the several taxpayers shown by the tax records to have made the payments originally.

(4) Immediately upon such reimbursement the tax collector shall make the necessary correcting entries in the records of the office of the tax collector.