As per Notification No. 66/2017 CT, dated 15.11.2017, Advance Received for Supply of GOODS will not attract GST at the time of receipt of advance money. The Time of Supply will be the date of issuing the Invoice and GST will be levied on that date ( i.e. Date of Issuing Invoice ).
But this Notification is not applicable for Dealers registered under SECTION 10 of CGST Act 2017 i.e. Composition Scheme.