The “net value of taxable supplies” means the aggregate value of taxable supplies of goods or services or both, other than the services on which entire tax is payable by the e-commerce operator, made during any month by all
registered persons through such operator reduced by the aggregate value of taxable supplies returned to the suppliers during the said month. (Refer to Explanation to Section 52(1) of the CGST Act, 2017).
(FAQ 9: E-COMMERCE)