Monthly returns.

(a) On or before the 20th day of each calendar month, every vendor who has made any sale at retail, taxable under the provisions of this chapter, during the preceding calendar month, shall file a return with the Mayor. Such returns shall show the total gross proceeds of the vendor’s business for the month for which the return is filed; the gross receipts of the business of the vendor upon which the tax is computed; the amount of tax for which the vendor is liable and such other information as the Mayor deems necessary for the computation and collection of the tax.

(a-1) For the purposes of this chapter and Chapter 22 of this title , a room remarketer shall be deemed a vendor with respect to additional charges and shall file returns and remit tax with respect to such additional charges. The room remarketer shall collect and remit the tax imposed by this chapter and Chapter 22 of this title with respect to the net charges for the accommodations to the operator of the hotel, inn, tourist camp, tourist cabin, or any other place in which rooms, lodgings, or accommodations are regularly furnished to transients for a consideration. The operator shall be deemed a vendor with respect to such net charges and shall file returns and remit tax with respect to such net charges.