Idaho State Tax Commission

Idaho State Tax Commission

Penalty & Interest Estimator

This form is to help you estimate your penalty and interest. Please make sure to choose the correct tax type before entering your information. Contact us if you have questions that aren't answered on this website.

Step 1 of 5: Choose the tax type (Idaho form used)

Calculate penalty and interest for:

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Last updated January 11, 2018

The information on this site is for general guidance only. Tax laws are complex and change regularly. We can't cover every circumstance in our website guides. We work to provide current and accurate information on our website. But some information could have technical inaccuracies or typographical errors. If there's a conflict between current tax law and the information on our website, current tax law will govern.