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How to File an Amended Idaho Return

amend Idaho taxes
"The Gem State"

If you need to change or amend an accepted Idaho State Income Tax Return for the current or previous Tax Year, you need to complete Form 40 (residents) or Form 43 (nonresidents and part-year residents) Forms 40 and 43 are Forms used for the Tax Amendment. You can prepare a 2020 Idaho Tax Amendment on eFile.com, however you cannot submit it electronically. In comparison, the IRS requires a different Form - Form 1040X - to amend an IRS return (do not use Form 1040 for an IRS Amendment). 

The IRS might send you a notification to change an error on your Return, or you might have discovered an error. If you or the IRS amended or changed one of your IRS Tax Return(s), the IRS will report this to the Idaho Tax Agency, thus you should file a Idaho Amendment within one year.

Prepare, eFile a 2020 ID + IRS Tax Return: Detailed eFile.com Service Overview
Prepare only a ID State Return without an IRS return. Details
Step by Step instructions on how to only Prepare and Download - not eFile - State Returns on eFile.com.
File a 2020 Idaho Tax Amendment
You cannot eFile a ID Tax Amendment anywhere, except mail it in. However, you can prepare it here on eFile.com.
Option 1: Sign into your eFile.com account, modify your Return and download/print the ID Form 40 (residents) or Form 43 (nonresidents and part-year residents) under My Account. Check the "Amended Return" box, sign the form, and mail it to one of the addresses listed below.
Option 2: If you don't have an eFile.com account follow the step by step instruction on how to prepare a tax return/amendment.
Option 3: If you want to do the math on your own paper return then complete, sign ID Form 40 or Form 43 - Print, Mail the Form to ID State Tax Commission to:
Idaho State Tax Commission
P.O. Box 56
Boise, ID 83756-0056
ID Tax Amendment Form 40 or 43
This Form can be used to file a: Tax Return, Tax Amendment, Change of Address. Check the "Amended Return" box on the Form.
Step 1: Download, Complete Form 40 (residents) or 43 (nonresidents and part-year residents) for the appropriate Tax Year below.
Step 2: Sign, Mail Form 40 or 43 to one of the addresses listed above
Tax Year 2020 only: Prepare online on eFile.com until Oct. 15, 2020. When done Print, Sign and Mail in - not eFile - Your Tax Amendment, Address Change, etc.
After Oct. 15 Prepare, Print, Sign and Mail-In - see address above - your Tax Year 2020 - Form 40 or Form 43.
How to correct a rejected Tax Return
If your ID Tax Return was rejected by the ID Tax Agency - not eFile.com - instructions on how to correct a rejected Idaho Tax Return.
Check Your ID Tax Amendment Status
1. Call the ID State Tax Commission at (800) 972-7660
2. Contact the ID State Tax Commission
Idaho Refund Deadlines
A. Three years from the due date of the original tax year return, including valid filing extensions.
B. One year from the final determination of the amended federal return or federal change, whichever is later, provided that the allowable refund is not more than the decrease in Idaho tax attributable to the federal change or correction.
C. Two years from the payment of an assessment, provided the amended return raises issues relating only to the prior assessment and the refund does not exceed the amount of tax paid on the prior assessment.
D. Two years from the filing of an amended Idaho return resulting in the payment of additional tax, provided that the current amended return raises issues relating solely to the prior amended return and that the refund does not exceed the amount of the tax payment made as a result of the prior amended return.
Additional Idaho Tax Income Taxes Deadlines
Idaho Income Tax Penalties
Find out how Idaho Late Filing and Late Payment Penalties are calculated.
For IRS Tax and Late Filing Penalties we have an easy to use tool: The PENALTYucator.
File an IRS Tax Amendment by Tax Year
Instructions on how to prepare an IRS Tax Amendment on eFile.com, however the IRS does not accept Tax Amendments electronically.