Penalty & Interest Estimator
tax.idaho.gov/piest
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:
- Income tax for individuals » (Forms 40 or 43)
- Income tax for businesses » (Forms 41, 41S, 65, or 66)
- Sales or use tax » (Form 850)
- Withholding payment » (Form 910)
- Withholding annual reconciliation » (Form 967)
Did you know?
- In many cases, your penalty can be greatly reduced by filing your tax return on time, even if you can't pay.
- If you e-file your tax return, your penalty and interest will be calculated for you when you file.
- This is our interest rate table.
