Oregon Governor Kate Brown recently signed Senate Bill 164 (SB 164), which provides a fiscal-year filing option for Oregon Corporate Activity Tax (CAT) taxpayers who use a fiscal tax year rather than a calendar year for federal tax purposes. SB 164 provides that for a fiscal tax year ending during 2021, taxpayers will be required to file short-year CAT returns covering January 1, 2021 through the end of their respective fiscal tax years. In addition, SB 164 edits certain due dates: (1) the return filing due date will become the fifteenth day of the fourth month following the end of the tax year; and (2) the due dates for estimated payments will become the last day of the fourth, seventh and tenth months of the tax year, and the first month following the end of the tax year. SB 164 goes into effect September 25, 2021. The Oregon Department of Revenue recently posted informal guidance regarding SB 164 on its website and sent an email to its subscribers noting that it is developing administrative rules related to the changes made by SB 164 and expects to provide details about such changes in early 2022.