How to File an Oregon Amended Tax Tax Return
When Do I Need to file an Oregon State Tax Amendment?
If you are expecting a refund, you have up to 3 years since the due date of the original return or the date you actually filed the original tax return, whichever is later, to file a tax amendment form to claim your refund.
If it has already been 3 years since those deadlines passed, then you still may file a tax amendment and get a refund if it has been less than 2 years since you paid the tax, if you had a net operating loss carry back, or the IRS made changes to your federal tax return.
In case of a net operating loss carry back you have 3 years to file an amendment since the year when the loss occurred. In case of an IRS correction, you have 2 years to file an amendment since the date of the correction.
How Do I Correct My Accepted Oregon Tax Return or File a Tax Amendment in Oregon?
If there are changes in your previously filed income tax return, then you must file a tax amendment form. Here's how:
- Download and complete Form 40 (residents), Form 40N (nonresidents), or Form 40P (part-year residents) yourself.
- Print out the form and mail it to one of these addresses: Oregon Department of Revenue, PO Box 14555, Salem OR 97309-0940 (payment due) or REFUND, PO Box 14700, Salem OR 97309-0930 (refund or no payment due).
Oregon State Tax Amendment Forms (Download, Fill Out, Print Out, and Mail)
If you choose to complete the amendment yourself and mail it, fill out the Amended Schedule form provided below.
Resident Forms
Non-Resident Forms
Part Year Resident Forms
How Do I Check the Status of My Amended Oregon Tax Return?
You can call the Oregon Department of Revenue at (800) 356-4222.
What Are the Penalties, Interest, and Fees Related to Oregon Tax Amendments?
The state of Oregon computes interest on underpaid estimated tax. If the underpayment is $1,000 or greater, then you have to complete Oregon Form 10- Underpayment of Oregon Estimated Tax to calculate the interest due.
In other cases the interest rate is determined by the following table:
| Time Period |
Annual Interest Rate |
| Jan 16, 2011 - Jan 15, 2014 |
5% |
| Jan 16, 2014 - Dec 31, 2017 |
4% |
| January 1, 2018 and after |
5% |
Where Do I Mail My Amended Oregon Tax Return? - Oregon Mailing Address:
If payment is due, mail to:
Oregon Department of Revenue
PO Box 14555
Salem OR 97309-0940
If you are expecting a refund or no tax payment is due, mail to:
REFUND
PO Box 14700
Salem OR 97309-0930
Oregon Department of Revenue Phone Number: (800) 356-4222
Oregon Department of Revenue
Where Do I Find More Information on Oregon State Taxes?
How Do I Only File My Oregon Tax Return?
Where is my Oregon State Tax Refund?
Oregon Extensions
Oregon State Taxes
What If I Need to Fix My Accepted Federal Tax Return?
Learn how to amend your IRS taxes.