Customs guide

Five paperwork mistakes that hold containers at the port

The common errors that trigger holds and storage fees, and how to avoid them before you ship.

Marcus O.Oct 7, 2026 · 4 min read

Most customs holds have nothing to do with the goods themselves. They come from paperwork that does not match. Here are the five mistakes we see most, and how to avoid each one.

1. Invoice values that look too low

If the declared value is far below the market price, officers will ask questions. Declare the real transaction value and keep proof of payment ready.

2. Vague descriptions

"Parts" or "samples" is not enough. Describe what the goods are, what they are made of and what they are used for.

3. Packing list and invoice that disagree

The number of cartons, the weights and the item list must match on every document. A single typo can stop a container.

4. Late ISF filing

For US imports by sea, the Importer Security Filing is due 24 hours before loading. Late filings bring fines and extra inspections.

5. The wrong HS code

Classification decides your duty rate. When in doubt, ask a broker before you ship, not after the container lands.

Written byMarcus O.

Marcus is a licensed customs broker who leads our brokerage team and helps importers clear goods without delays.

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