Oregon Revised Statutes Revenue and Taxation § 314.505

(1) Every corporation expecting to have a tax liability under either ORS chapter 317 or 318 of $500 or more shall make an estimate of tax liability for the corporation's tax year and pay the amount of tax determined as provided in ORS 314.515.

(2) The Department of Revenue shall by rule provide for the payment of estimated tax liability by a group of affiliated corporations filing a consolidated return.

(3) As used in ORS 314.505 to 314.525, the term “estimated tax liability” means the tax computed under ORS chapter 317 or 318 less the credits allowed for purposes of ORS chapter 317 or 318.