The Commercial Invoice for Customs: What Customs Actually Reads

Most export problems don't start at the port — they start with a commercial invoice that customs can't make sense of. Your shipment might be fine, but if the invoice says "various goods" and the declared value doesn't match the packing list, the container sits in a holding area while everyone emails back and forth. This is the document where small exporters lose the most time, and it's also the one you can mostly get right yourself before a freight forwarder ever looks at it.

What a commercial invoice for customs is for

Customs uses it to answer three questions: what is it, what is it worth, and where is it from. The answers determine duty, taxes and whether the shipment is even admissible. That's why the invoice has to describe goods the way customs wants to hear them, not the way your sales team does.

• Seller and buyer — full legal names and addresses of exporter and importer. If a freight forwarder or trading company is in the middle, make the actual parties clear.
• A plain-language description — material, model and intended use ("steel bolts, M8, for automotive use") beat "hardware". Vague descriptions invite inspection.
• HS code — the harmonised code for each line. Getting this right matters: a wrong code can mean the wrong duty rate or a hold. If you don't know yours, your forwarder or a customs broker will help — it's their daily work.
• Quantity, unit value and currency — per line, matching your packing list exactly.
• Weights and packaging — net and gross weight, carton counts. Under-declaring weight is a classic way to trigger a check.
• Country of origin — per line when goods come from different countries; some trade agreements hinge on it.
• Your invoice number and date, plus any reference your customer's broker gave you.

INCOTERMS: the three letters that change the numbers

INCOTERMS (like EXW, FOB, CIF or DDP) say who arranges and pays for freight and insurance. They matter here because the declared value customs uses usually reflects that — under CIF, freight and insurance are typically part of what's declared; under EXW they aren't. A quick rule of thumb for reading them: the further down the alphabet, the more the seller arranges and pays. When in doubt, let the term on your sales order drive the term on the invoice, and let your forwarder sanity-check the declared value logic.

Keeping the paperwork consistent

A commercial invoice almost never travels alone. The packing list breaks down what's in each carton, and the bill of lading is the carrier's receipt for the voyage. Customs compares them — quantities, weights and descriptions should match across all three. If you're assembling a shipment set, SleekKitBox has a packing list template and a bill of lading template to go with the invoice, and you can merge the documents into one PDF for the freight forwarder or for your own records.

How to create yours with SleekKitBox

1. Open the Commercial Invoice template.
2. Fill in seller and buyer, then each line with a clear description, HS code, quantity, unit price and weights.
3. Pick the INCOTERMS and add freight and insurance lines where they belong.
4. Download the PDF, double-check it against your packing list, and send the set to your forwarder.

If a portal or email service rejects your file because it's too large, compressing the PDF usually sorts it out without hurting readability — handy when you're attaching several shipment documents at once.

Frequently asked questions

Who fills in the HS code — me or the forwarder? Legally it's the exporter's responsibility, but in practice brokers and forwarders work it out with you. If you ship regularly, build a short list of your own codes so you're not guessing each time.

Does the declared value have to match the buyer's payment? It should reflect the transaction value for the goods. Inflating or deflating it to "help" with duties is exactly the kind of thing customs penalties are built around — keep it honest.

How many copies do I need? Your forwarder will tell you what their lanes require; many work from a digital copy now. Keep one clean original for your own export file regardless.

Can the same invoice cover multiple shipments? No — issue one per shipment, with quantities matching what's actually on that voyage.

👉 Prepare your next shipment: free Commercial Invoice template →