Idaho FAQ - Amended Returns

Full-year Idaho residents should amend income tax returns by completing a corrected Form 40. Part-year Idaho residents and Idaho nonresidents should amend income tax returns by completing a corrected Form 43.

For tax years prior to 2001 complete the required form(s) and then write “AMENDED RETURN” at the top of the page. Attach information that will provide an explanation as to why the return is being amended.

For tax years 2001 and later complete the required form(s) and check the box for an amended return in the upper-left corner of the form. Attach information that will provide an explanation as to why the return is being amended.

Attach the following documents to your Idaho amended return:

A full copy of Form 1040X if your federal return has been amended,
Copies of 1099s and/or W-2s that were not included with the original return, and
If necessary, any required payment.

Generally amended returns must be mailed. However, the amended return may be filed electronically if the original return was filed electronically.

Please note that you will not be able to efile an amended return through OnLine Taxes.

Back