(a) Except as otherwise expressly provided by law, all state taxes and licenses except ad valorem and income taxes shall be due and payable either with the return or within 30 days after notice, as the case may be.

(b) When the collection of any tax specified in subsection (a) of this Code section is deferred under any law and unless a higher rate of interest or penalty is fixed by law, interest at the rate specified in Code Section 48-2-40 shall be collected thereon from the due date until the date of payment.