Shipping basics
Customs documents explained
A handful of documents move every shipment through customs. Once you know what each one actually proves, the paperwork stops being a mystery.
Why the paperwork exists
Customs authorities cannot see inside a container. They rely entirely on documents to know what is being shipped, what it's worth, who it belongs to, and whether it is allowed in at all. Every document in a shipment answers one of those questions. Once you see them that way, they stop feeling arbitrary.
The core documents, tap to expand
Invoice
Commercial Invoice
The bill for the goods. States what is being sold, to whom, the quantity, the price, and the agreed Incoterm. Customs uses it to value the shipment for duty and tax.
Packing List
What's actually in the box
A detailed breakdown of what is physically packed, how, and in what quantities, with weights and dimensions per carton or pallet. Used to verify the shipment matches the invoice.
B/L or AWB
Bill of Lading / Air Waybill
The transport contract issued by the carrier. It is proof the goods were received for shipment and, for sea freight, is often needed to claim the goods at destination.
Certificate of Origin
Where the goods were made
A document certifying the country of manufacture. Can qualify goods for reduced tariffs under a free-trade agreement, or may simply be required for the shipment to clear.
Import Permit
Customs declaration
The formal declaration to the destination country's customs authority, filed before or on arrival, usually by a licensed declaring agent.
Authority Approval
For controlled goods
Extra sign-off from a relevant regulator for goods like food, health products, or electronics, on top of the standard customs permit.
Who typically prepares what
- The seller usually prepares the commercial invoice, packing list, and Certificate of Origin.
- The carrier or forwarder issues the Bill of Lading or Air Waybill once the goods are booked.
- A declaring agent, often arranged by your forwarder, files the customs permit on the importer's behalf.
- The importer is generally responsible for making sure any required authority approvals are in place before the goods arrive.
Good to know: your Incoterm decides who is responsible for which of these, which is exactly why getting the Incoterm right at the start avoids confusion later.
Your document checklist
Tap each one off as you gather it for a shipment:
Commercial InvoiceMatches the agreed price, quantity, and Incoterm.
Packing ListMatches the invoice exactly, no surprises for the inspector.
Bill of Lading or Air WaybillIssued by the carrier once cargo is booked.
Certificate of Origin (if needed)Check if your trade lane has an FTA that requires or rewards one.
Import permit filedUsually handled by your declaring agent before arrival.
Any required authority approvalConfirmed before the goods ship, not after.
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Mistakes that cause delays
- Invoice and packing list don't match. Even small mismatches in quantity or description trigger holds.
- Vague product descriptions. "Electronics" or "parts" is not enough, customs wants specifics.
- Missing signatures or dates on documents that require them.
- Leaving authority approvals until the goods have already shipped. Confirm these before departure, not after.
The takeaway: almost every customs delay traces back to a document that doesn't quite match another one. Consistency across your paperwork is the single biggest thing you control.
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