How to File an Amended Idaho State Tax Return

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What Is the Idaho Definition of a Tax Amendment?

If there have been changes made to your taxable income, deductions or tax credits that affect your Idaho state income tax return, then you must file a tax amendment.

How to File a Tax Amendment in Idaho

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

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

If you are resident of the state of Idaho, then fill out Form 40, specifying that the return is amended by checking the appropriate box.

If you are a nonresident or part-year resident of Idaho, then fill out Form 43, specifying that the return is amended by checking the appropriate box.

Make sure to attach all the necessary forms, including a 1040X form if you amended your federal tax return as well.

A resident of a state is generally defined as someone who is domiciled in that state and has a permanent residency there that serves as a place of return after trips.

A part-year resident is generally defined as someone who resides in a particular state for only part of the year.

Resident Forms

Form (Tax Year)Description
Form 40 (2013) Idaho Individual Income Tax Return: Residents
Form 40 (2012) Idaho Individual Income Tax Return: Residents
Form 40 (2011) Idaho Individual Income Tax Return: Residents
Form 40 (2010) Idaho Individual Income Tax Return: Residents
Form 40 (2009) Idaho Individual Income Tax Return: Residents

Nonresident and Part-year Resident Forms

Form (Tax Year)Description
Form 43 (2013) Idaho Part-Year Resident and Nonresident Income Tax Return
Form 43 (2012) Idaho Part-Year Resident and Nonresident Income Tax Return
Form 43 (2011) Idaho Part-Year Resident and Nonresident Income Tax Return
Form 43 (2010) Idaho Part-Year and Nonresident Income Tax Return
Form 43 (2009) Idaho Part-Year and Nonresident Income Tax Return

Penalties, Interest, and Fees

The state of Idaho charges interest for unpaid or underpaid tax.

Year(s)Annual Interest Rate
2013 3%
2012 4%
2011 4%
2010 5%
2009 5%
2008 7%
2007 7%
2006 6%
2005 6%
2004 6%
2003 5%
2002 7%
2001 8%
2000 8%
1999 7%
1998 8%
1997 9%
1996 8%
1995 9%
1994 7%
July 1981- December 1993 12%

Where to Mail Your Idaho Tax Amendment - Idaho Mailing Address:

Idaho State Tax Commission
PO Box 56
Boise, ID 83756-0056

 

Learn how to file a federal tax amendment.

More information on ID state taxes.

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