Partner - Audit & Assistance
4825 Points
Joined December 2018
Section 10 of IGST Act determines the Place of Supply.
Where there is a movement of goods (either by supplier, recipient or any other person) - the place of supply is where goods terminate for delivery.
Where there is no movement of goods - the location where goods are handed over.
In your case, it is impossible to determine whether the customer may take to Nepal, or to any other state, therefore, for your transaction, the delivery ends at the shop and CGST & SGST is liable.
Where it is clear that goods are going to Nepal (ex: supplier has to ship the goods), then IGST needs to be charged.
Ensure terms and conditions in invoice cover this aspect to avoid future disputes.