Oregon Revised Statutes Revenue and Taxation § 310.230

(1) If the total statewide amount of additions of value certified to the Department of Revenue under ORS 310.220 (4) exceeds four percent of the assessed value of taxable property in this state for the tax year beginning July 1, 1997 (not taking into account the additions of value certified under ORS 310.220), the department shall subtract the portion of the Measure 47 comparison taxes attributable to additions of value in excess of four percent from the statewide total of Measure 47 comparison taxes, prior to making the computation under ORS 310.222.

(2) The supplemental statutory reduction percentage determined under ORS 310.222 (6) shall be adjusted so as to achieve the same total reduction percentage for the taxes described in ORS 310.222 (1)(b) as is achieved for the statewide constitutional reduction percentage following the calculation in subsection (1) of this section.