Once the provisions of ORS 314.410(6) have been exercised, the Department and the taxpayer may, by written agreement, extend beyond the original agreed period the period for mailing a notice of deficiency or assessing a deficiency, provided the subsequent agreement is made before the original agreement expires.
Or. Admin. Code § 150-314-0228
Stat. Auth.: ORS 305.100
Stats. Implemented: 314.410