There is no official USMCA form. A certification can sit on an invoice or a separate document, which makes it feel informal, and that feeling is the trap. The document asserts that the good meets a rule of origin, a change in tariff classification, a regional value content threshold, or another specified criterion, and the importer claiming preference is responsible for that assertion being true, even when a supplier wrote the words.
Importers of record cannot outsource the liability by pointing at the supplier's letterhead. Reasonable care means the importer held a basis for the claim when it was made: the certification, plus enough supporting material, bills of material, production records, or supplier declarations covering components, to show the criterion was actually met rather than merely asserted.
Collect the certification before entry, check the nine elements are present, and confirm the blanket period if one certification covers multiple shipments, which USMCA permits for up to twelve months. Match the description and six digit classification on the certification against the entry lines. A certification describing a different good, or a classification your own broker disputes, is a problem to solve before the claim, not during verification.
Ask for the origin working, not just the conclusion, on any good where the criterion is not obvious. For goods made from non originating components, the file should show how the tariff shift or value content test was satisfied. Suppliers who manufacture the product can produce this. Suppliers who cannot produce it may be repeating a claim they inherited, which is how unverified preference chains form.
CBP verifies origin claims through written requests and, for some cases, verification visits, and it does so on its own timeline, potentially years after entry. The importer must be able to produce the certification and supporting records, and records generally need to be kept for five years. A claim that cannot be documented at verification is denied, duties are assessed at the MFN rate, and penalties become a conversation if the pattern looks careless.
Run your own verification first. Once a year, sample USMCA entries, pull the file cold, and try to prove the claim from the documents alone, as if you were the officer reading them. The gaps that exercise finds, missing blanket renewals, a supplier whose certification lapsed mid year, descriptions that drifted from the shipped goods, are exactly the findings a real verification would make, at a fraction of the price.
Some supply chains cannot document origin to the standard the claim requires: components from shifting sources, a producer who will not open their records, a good assembled from inputs whose origin nobody tracked. In those cases the correct commercial decision is to enter at the MFN rate and fix the sourcing records for future shipments. Preference claimed without a file is not a saving. It is a deferred liability priced at the full duty plus interest, discovered at the worst moment.
Price that honestly in the landed cost. A product that only works financially on an undocumented preference claim does not work financially. Buyers who understand that sentence will push suppliers for origin records at onboarding, when leverage exists, instead of at verification, when it does not.
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The importer, exporter, or producer can certify. The certification must contain the nine data elements USMCA specifies, including certifier and party details, a description and six digit HS classification of the good, the origin criterion, and the certification date and signature. There is no mandatory government form, but the data elements are not optional.
A certification can cover a single shipment or serve as a blanket certification for multiple shipments of identical goods over a period of up to twelve months. Track blanket expiry dates like licences. Entries claimed after the blanket period ends are claims without a certification behind them.
Import records, including origin documentation, generally need to be retained for five years, and CBP can verify a preference claim well after entry. Build the file at shipment time and keep it complete. Reconstructing production records years later, from a supplier you may no longer buy from, rarely succeeds.
Preference is denied and duties are assessed at the standard MFN rate, with interest, and a careless pattern can draw penalties. If you find an unsupported claim yourself, talk to customs counsel about a prior disclosure before CBP finds it. Voluntary correction is treated very differently from a claim defended until it collapses.