Payment of tax.

(a) At the time of filing his return as provided by this chapter, the taxpayer shall pay to the Collector the taxes imposed by this chapter.

(b) The taxes for the period for which a return is required to be filed by a vendor under this chapter shall be due by the vendor and payable to the Collector on the date limited for the filing of the return for such period, without regard to whether a return is filed or whether the return which is filed correctly shows the amount of gross receipts and taxes due thereon.