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 August 17, 2020

This information is for general guidance only. Tax laws are complex and change regularly. We can't cover every circumstance in our guides. This guidance may not apply to your situation. Please contact us with any questions. We work to provide current and accurate information. But some information could have technical inaccuracies or typographical errors. If there's a conflict between current tax law and this information, current tax law will govern.