Oregon Revised Statutes Revenue and Taxation § 319.190

(1) Every dealer in motor vehicle fuel shall render to the Department of Transportation, on or before the 25th day of each month, on forms prescribed, prepared and furnished by the department, and in the manner provided by the department by rule, a signed statement of the number of gallons of motor vehicle fuel sold, distributed or used by the dealer during the preceding calendar month. The statement shall be signed by one of the principal officers, or by an authorized agent in case of a corporation; or by the managing agent or owner in case of a firm or association.

(2) The signed statement filed with the department as required by this section is a public record. All other documents, including supporting schedules and information received from other taxing jurisdictions and entities, shall be kept confidential and exempt from public inspection except that such information may be shared with tax collecting entities in other jurisdictions on the condition that the receiving jurisdiction agrees to keep such information confidential. If a statement is not received on or before the 25th day of each month, a penalty shall be assessed pursuant to ORS 319.180 or, if the department determines that no tax is due, a penalty of $25 shall be assessed.