How to File an Idaho State Tax Return
- 1). Fill out Form 40, the Idaho Individual Income Tax Return, with the required information. You will need to list basic identifying information, family data, deductions and sources of income earned during the year.
- 2). Compute the total amount of your refund or owed taxes according to the form's instructions. Record your bank information if you prefer direct deposit as the means of receiving your refund.
- 3). File the form on or before April 15 of the current calendar year. You can e-file at tax.idaho.gov or submit the document by mail to Idaho State Tax Commission, P.O. Box 56, Boise, ID 83756.
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