28/09/2026
"My container hasn't even reached Chennai and a buyer wants it. How much GST do I charge?"
Zero. Legally. As long as you sell before one moment.
A high sea sale is when you transfer imported goods to a buyer by endorsing the bill of lading, after the ship leaves the foreign port and before the goods are cleared for home consumption in India. The GST rule behind it, CGST Act Schedule III para 8(b), never mentions the sea. It checks timing and paperwork, not nautical miles.
For the seller: it is neither a supply of goods nor a supply of services. No GST on your invoice, and no ITC reversal, because the s.17(3) Explanation keeps 8(b) out of "exempt supply".
For the buyer: they become the importer. The bill of entry is filed in their name, under their IEC, and they pay customs duty and IGST at the port. IGST is charged once, and every high sea markup is counted in its value (Circular 33/2017-Customs).
Where to report it: the GSTR-9 instructions say it in writing. The value of "no supply" goes in Table 5F, non GST supply. Not exempt, not nil rated; those are still supplies, and this isn't one. GSTR-1 and GSTR-3B have no row named "no supply" and practice varies, so settle one treatment with your CA and keep it consistent with the annual return.
The trap: sell after the goods are cleared and it's an ordinary sale inside India, with full GST. Date the high sea sale agreement and the endorsed bill of lading before clearance.
Got a shipment on the water right now? DM IMPORT and we'll check the deal while it's still at sea.
The client, the route and the goods in this reel are illustrative.