How to File an Amended Idaho State Tax Return

Idaho State Taxes
amend Idaho taxes
Idaho
"The Gem State"

When Do I Need to File My Idaho Tax Amendment?

Your amended Idaho state return should be filed within 3 years of the filing deadline for the original tax return, or 2 years from the time when tax was paid (whichever is later).

How Do I Fix My Accepted Idaho Tax Return or File an Idaho 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 an Idaho tax amendment. You have two options to prepare and file an amended Idaho tax return:

  1. Prepare and file either Form 40 (residents) or Form 43 (nonresident and part-year residents). Make sure you check off the box indicating that it's an amended return. When you're done, print out the return and mail it to this address: Idaho State Tax Commission, PO Box 56, Boise, ID 83756-0056 OR
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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 and check the amended return box. Make sure to attach all the necessary forms (including a 1040X form if you amended your federal tax return as well) to your amended return.

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 (2014) Idaho Individual Income Tax Return: Residents
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

Nonresident and Part-year Resident Forms

Form (Tax Year)Description
Form 43 (2014) Idaho Part-Year Resident and Nonresident Income Tax Return
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

How Do I Check the Status of My Idaho State Tax Amendment?

You can call the Idaho State Tax Commission at (800) 972-7660.

What Are the Penalties, Interest, and Fees Related to Amended Idaho Tax Returns?

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

Year(s)Annual Interest Rate
2015 4%
2014 4%
2013 3%
2012 4%
2011 4%

Where Do I Mail My Idaho Tax Amendment? - Idaho Mailing Address:

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

Idaho State Tax Commission Phone Number: (800) 972-7660

Idaho State Tax Commission

Where Do I Find More Idaho State Tax Information?

How Do I Only File My Idaho Tax Return?

Where is my Idaho State Tax Refund?

Idaho Tax Extensions

Idaho State Income Taxes

What If I Need to Fix My Accepted Federal Tax Return?

You will need to file a federal tax amendment.

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