Oregon Administrative Rules
Chapter 150 - DEPARTMENT OF REVENUE
Division 314 - INCOME TAXATION GENERALLY GENERAL PROVISIONS
Section 150-314-0323 - Estimated Tax: Interest on Underpayment

(1) When an estimated tax payment is underpaid, as defined in OAR 150-314.525(1)-(A), interest accrues on the underpaid amount at the rate provided in OAR 150-305.220(1) from the due date of the payment to the earlier of the date the tax is paid or the date the tax return is due.

(2) Interest on underpayment of estimated tax (under ORS 314.525) will not be imposed if the tax on the prior year's return was not over $10. A large corporation, as defined in ORS 314.525(5), may only use the exception for the first installment required.

(3) Underpayment interest will not be imposed for a quarter in which the annualized taxable income results in a net annualized tax of $10 or less.