Oregon DOR Proposes Amendment to Substantial Understatement Penalty Rules

The Oregon Department of Revenue (DOR) proposed amendments to regulations concerning the substantial understatement penalty for income tax purposes. The proposed regulation removes the threshold dollar amounts for the substantial understatement of net tax from the regulation text and instead requires the department to publish the applicable threshold amounts on its website, with the thresholds to be adjusted annually for inflation. Comments on the proposal are due June 1. [Or. Dep’t of Revenue, Proposed Reg. Section 150-314-0205, 04/29/26]