Section 6.1 of GSTR – 3B, details of payment for GST has to be shown. Amount of Tax Payable, Amount of Tax paid under GST utilizing the ITC and balance amount in cash has to be shown along with interest and late if any payable for CGST, SGST, UTGST, IGST and Cess.
As per the Determination of Value of Supply Rules, the formula is given to derive the tax amount from the total value of supply in cases where the value of supply includes GST taxes. Tax amount= Value inclusive of taxes X tax rate in % of IGST or as the case may be CGST, SGST or UTGST divided by (100+ sum of tax rates, as applicable, in %).
As per CGST Act, all taxes, levies, and charges collected from the buyer should be part of the valuation except for the taxes under GST (SGST UTGST & Cess), if buyer and seller are not related parties.