Sir,
I am confused because going by the definitions given below it leads to understanding that
Aggregate Turnover is value of all supplies whereas the value of supply under Rule 6(5) is determined as difference between the selling price and purchase price in case of dealers in secondhand goods.
Aggregate turnover' is defined in section 2(6) of the Model GST Law as follows –
"Aggregate turnover means the aggregate value of all taxable and non-taxable supplies, exempt supplies and exports of goods and/or services of a person having the same PAN, to be computed on all India basis and excludes taxes, if any, charged under the CGST Act, SGST Act and the IGST Act, as the case may be."
Rule 6(5) of "Determination of Value of Supply" rules state as below: "Where a taxable supply is provided by a person dealing in buying and selling of second hand goods i.e. used goods as such or after such minor processing which does not change the nature of the goods and where no input tax credit has been availed on purchase of such goods the value of supply shall be the difference between the selling price and purchase price and where the value of such supply is negative it shall be ignored."