How to File an Oregon Tax Amendment

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What Is the Oregon Definition of a Tax Amendment?

If there are changes in your previously filed income tax return then you must file a tax amendment form.

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 that 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, or 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 to file a Tax Amendment in Oregon  

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You can also download, fill out, and mail your tax amendment.

Oregon State Tax Amendment Forms (download, print out, fill out, and mail)

If you choose to complete the amendment yourself and mail it, fill out the Amended Schedule form provided below.

Resident Forms 

Form (Tax Year)Description
Oregon Amended Schedule (All Tax Years) Oregon Amended Schedule for Amending Individual Income Tax Returns 
Form 40 (2014) 2014 Form available soon
Form 40 (2013) Oregon Individual Income Tax Form for Residents
Form 40 (2012) Oregon Individual Income Tax Form for Residents
Form 40 (2011) Oregon Individual Income Tax Form for Residents
Form 40 (2010) Oregon Individual Income Tax Form for Residents
Form 40 (2009) Oregon Individual Income Tax Form for Residents
Form 40 (2008) Oregon Individual Income Tax Form for Residents

Non-Resident Forms 

Form (Tax Year)Description
Form 40N (2014) 2014 Form available soon
Form 40N (2013) Oregon Individual Income Tax Form for Non Residents
Form 40N (2012) Oregon Individual Income Tax Form for Non Residents
Form 40N (2011) Oregon Individual Income Tax Form for Non Residents
Form 40N (2010) Oregon Individual Income Tax Form for Non Residents
Form 40N (2009) Oregon Individual Income Tax Form for Non Residents
Form 40N (2008) Oregon Individual Income Tax Form for Non Residents

Part Year Resident Forms 

Form (Tax Year)Description
Form 40P (2014) 2014 Form available soon
Form 40P (2013) Oregon Individual Income Tax Form for Part Year Residents
Form 40P (2012) Oregon Individual Income Tax Form for Part Year Residents
Form 40P (2011) Oregon Individual Income Tax Form for Part Year Residents
Form 40P (2010) Oregon Individual Income Tax Form for Part Year Residents
Form 40P (2009) Oregon Individual Income Tax Form for Part Year Residents
Form 40P (2008) Oregon Individual Income Tax Form for Part Year Residents

Penalties, Interest, and Fees

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 PeriodAnnual Interest Rate
Feb 16, 2002 - Feb 15, 2003 8%
Feb 16, 2003 - Jan 15, 2004 7%
Jan 16, 2004 - Jan 15, 2005 6%
Jan 16, 2005 - Jan 15, 2006 5%
Jan 16, 2006 - Jan 16, 2007 7%
Jan 17, 2007 - Jan 15, 2009 9%
Jan 16, 2009 - Jan 15, 2010 6%
Jan 16, 2010 - Jan 15, 2013 5%
Jan 16, 2013 - Jan 15, 2015 4%

Where to mail your tax amendment - Oregon Mailing Address:

Oregon Department of Revenue

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

Learn how to amend your IRS taxes.

More information on OR state taxes.

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