Idaho State Tax Commission

Idaho State Tax Commission

Penalty & Interest Estimator

Tax type: Income tax for a business (Forms 41, 41S, 65, or 66)

Step 1 of 5: Valid extension?

(See Form 51 for individuals' income tax or Form 41ES for businesses' income tax)

Learn more about a valid extension of time.

Step 2 of 5: Enter your tax due

…or STOP! and start over »

Last updated Nov. 16, 2016