Or. Rev. Stat. § 238.376
(1) If a person is receiving payments under this chapter, and after the payments commence the payments cease to be subject to Oregon personal income tax under ORS 316.127 (9), the person shall promptly notify the Public Employees Retirement Board by written statement that the payments are no longer subject to Oregon personal income tax under ORS 316.127 (9). The board shall reduce any benefits payable to the person by the amount by which the benefits were increased under chapter 796, Oregon Laws 1991, or chapter 569, Oregon Laws 1995. The reduction in benefits becomes effective:
(3) If a person is receiving payments under this chapter that have been reduced because the payments are not subject to Oregon personal income tax under ORS 316.127 (9), and the board receives notice under subsection (2) of this section that payments to the person under this chapter are once again subject to Oregon personal income tax under ORS 316.127 (9), or determines under ORS 238.378 that payments to the person under this chapter are once again subject to Oregon personal income tax under ORS 316.127 (9), the board shall resume payment of the increased benefits provided by chapter 796, Oregon Laws 1991, or chapter 569, Oregon Laws 1995. The increase in benefits becomes effective:
[2011 c.653 §4; 2013 c.53 §13; 2021 c.461 §4]