(1) Following a redetermination of a deficiency by the commission, the entire amount redetermined as the deficiency by the decision of the commission, which has become final, shall be assessed and shall be paid within 30 days from the date the notice and demand is sent from the commission.
(2) If the taxpayer does not file a petition with the commission within the time prescribed for filing the petition, the deficiency, notice of which has been sent to the taxpayer, shall be assessed, and shall be paid within 30 days from the date the notice and demand is sent from the commission.