Oregon tax penalties at a glance

When you file or pay Oregon taxes late, the Oregon Department of Revenue adds a penalty and charges interest on the unpaid balance. These state penalties are assessed under Oregon law and are entirely separate from any federal IRS penalty on your federal return.

Late-Filing Penalty
20% if filed more than 3 months after the due date (100% if no return for 3 consecutive years)
Late-Payment Penalty
5% on any tax not paid by the original due date, even with a valid filing extension
Interest on Unpaid Tax
8% per year (2026); additional 4% applies to tax unpaid more than 60 days after assessment
State Tax Authority
Oregon Department of Revenue
State DOR Phone
(503) 378-4988

Source: Oregon Department of Revenue (official guidance). Penalty caps and interest rates change — several states reset interest quarterly — so verify the current figure before relying on it.

Getting a Oregon penalty waived

Request a penalty waiver through Revenue Online or in writing, with documentation. Businesses must be current on all returns; interest is generally not waived.

Oregon vs. Federal

Most people who owe a Oregon penalty also owe a federal IRS penalty — and the federal one is usually larger. The good news: federal penalties can often be removed entirely through first-time abatement or reasonable cause. That is the part our practice handles.

The federal side: IRS penalties & Form 843

The IRS does not assess penalties differently in Oregon than anywhere else — failure-to-file, failure-to-pay, and failure-to-deposit penalties are governed by federal law and apply uniformly nationwide. What changes by state is the IRS service center your case routes through. For Oregon, federal abatement requests are processed through the IRS service center in Ogden, UT.

The mechanism is the same everywhere: Form 843, mailed with substantiation. The legal grounds are first-time penalty abatement, reasonable cause, statutory exception, or administrative waiver. When abatement is granted, the IRS refunds the penalty and the interest it charged on that penalty.

Federal Form for Abatement
Form 843 (mailed)
IRS Service Center
Ogden, UT
Authorization Form
Form 8821 (Tax Info Auth)
Typical IRS Processing
60–120 days

What our practice does for Oregon taxpayers

We represent clients in all 50 states under IRS Circular 230 authorization. Because federal abatement is state-agnostic, location is rarely a constraint. For Oregon clients specifically, we pull your IRS transcripts (via Form 8821), confirm exactly which penalties were assessed and for which periods, route Form 843 to the Ogden, UT service center, and build the reasonable-cause substantiation. The work is contingency-based: if we do not recover, you do not pay.

Start with the calculator on this page — enter your name, email, and rough penalty and interest amounts. We return a refund estimate within one business day and, if you choose to proceed, send the Form 8821 authorization for signature.