Generally, Oregon corporation excise tax law, as related to the definition of taxable income, is tied to federal tax law as applicable to the tax year of the taxpayer. Changes enacted to the definition of federal taxable income are effective for Oregon tax purposes in the same manner as for federal tax purposes, unless otherwise provided in Oregon tax law.
Or. Admin. Code § 150-317-0080
Stat. Auth.: ORS 305.100
Stats. Implemented: ORS 317.018