Idaho Statutes Title 63. Revenue and Taxation § 63-3044. Deficiency in tax

(1) The amount by which the tax imposed by this act exceeds the amount shown as the tax by the taxpayer upon his return; but the amount so shown on the return shall first be increased by the amounts previously assessed (or collected without assessment) as a deficiency, and decreased by the amounts previously abated, credited, refunded, or otherwise repaid in respect of such tax; or,

(2) If no amount is shown as the tax by the taxpayer upon his return, or if no return is made by the taxpayer, then the amount by which the tax exceeds the amounts previously assessed (or collected without assessment) as a deficiency; but such amounts previously assessed, or collected without assessment, shall first be decreased by the amounts previously abated, credited, refunded, or otherwise repaid in respect of such tax; or,

(3) Any amount of tax which is due and unpaid.