(1) The taxes levied under this part shall be due and payable monthly, on the first day of each month, and for the purposes of ascertaining the amount of tax payable under this part, it shall be the duty of all dealers on or before the twentieth day of each month to transmit to the commissioner returns showing the gross charges of fuel taxable under this part during the preceding calendar month.
(2) At the time of transmitting the return required under this section to the commissioner, the dealer shall remit to the commissioner with the return the amount of tax due, and failure to so remit the tax shall cause the tax to become delinquent.