Oregon Revised Statutes Public Financial Administration § 294.635

(1) In each county that has a tax supervising and conservation commission, the levying boards of all municipal corporations that have a population exceeding 200,000 and municipal corporations that have not made an election under ORS 294.625 (2) shall, on or before May 15 of each fiscal year or on or before May 15 of the first fiscal year of a budget period, submit their detailed estimates of the budget deemed necessary to be expended by the municipal corporations, respectively, for all purposes for the next ensuing fiscal year or ensuing budget period. The tax supervising and conservation commission may, if a good and sufficient reason exists therefor and if application is made to the commission in writing, grant any municipal corporation such extension of time for filing its budget as may seem to the commission just and reasonable.

(2) The budget estimates required by this section to be filed with the commission shall be in writing and shall be certified to as correct and shall be so prepared and arranged as to show in plain and succinct language each particular item of proposed expenditure. There shall be attached to each budget, and made a part thereof, the levying board's estimate of the probable receipts of the municipal corporation from all other sources than direct tax levy and bond issues during the fiscal years for which the budget has been prepared. The budget estimates shall show in parallel columns the actual expenditures for the two fiscal years next preceding the current year, the estimated expenditures for the current year and the estimated expenditures for the next ensuing fiscal year.