A preference claim asks customs to apply the lower free trade agreement rate instead of the standard rate. It only works when the product meets the agreement's rules of origin and the importer holds valid proof, usually a certificate or declaration of origin, at the time of entry.
The gap between the standard rate and the agreement rate
For many products the standard duty rate and the free trade agreement rate are not close. A good that enters at eight percent under the normal rate may enter duty free under an agreement, and on a container of merchandise that gap is the entire margin argument. Yet brokers file entries at the standard rate every day for goods that would have qualified, because nobody checked.
For more on this, see this related guide and our earlier explainer on the same theme.
The reverse error is worse. Claiming the agreement rate on goods that do not actually qualify does not produce a refund request later; it produces a duty bill with interest, and sometimes penalties, when customs reviews the entry. Preference is worth real money in both directions, which is why it deserves a process instead of a guess at entry time.
Rules of origin decide everything
An agreement rate is not earned by shipping from a partner country. It is earned by meeting that agreement's rules of origin, which typically ask whether the good was wholly obtained there, made entirely from originating materials, or transformed enough to shift its tariff classification. A product assembled in a partner country from parts sourced elsewhere may qualify, or may not, depending on the specific rule for its classification.
This analysis has to happen per product, with the bill of materials in hand, before the first shipment. It cannot be improvised from the invoice at the border. Importers who sell a changing catalog should build the origin determination into product onboarding, so the duty treatment is settled while there is still time to change a supplier.
Proof you need before the claim, not after
Every agreement runs on documentation. Most require a certificate of origin or a written declaration containing specified data elements, signed by the exporter, producer, or importer depending on the agreement. The document does not usually travel with the entry, but the importer must hold it, or be able to obtain it, when the claim is made.
Readers also found this companion piece from our archive useful.
Keep the supporting file behind the certificate too: bills of materials, production records, and supplier declarations that show why the good qualifies. Customs can ask for the substantiation years after entry, within the record keeping window, and a certificate with nothing behind it is an assertion, not evidence. If your supplier cannot produce the backup, treat the claim as unproven.
Where preference claims go wrong
The common failures are clerical, not conceptual. The wrong special program indicator on the entry, a certificate that covers the wrong period, a product quietly reformulated with a new non originating component while the claim continues unchanged. Each one converts a legitimate saving into an underpayment that surfaces at the worst possible time, usually during a focused assessment or a broker change.
Assign the claim an owner and a review trigger. Any change in supplier, factory, or materials reopens the origin question automatically. And reconcile claimed entries quarterly against the certificates on file; the cheapest preference error is the one your own audit finds before customs does.
Frequently asked questions
Can I claim preference after entry if I missed it?
Often yes, within limits. Many agreements allow post importation claims for a set period, commonly one year from entry, with the required documentation and a refund of the excess duty. The mechanics differ by agreement, so act quickly and confirm the current procedure with your broker.
What is a certificate of origin?
It is a signed statement that a good meets the origin rules of a specific agreement, identifying the good, its classification, and the basis for the claim. Some agreements prescribe a form; others accept a declaration with required data elements. Blanket certificates can cover repeated shipments over a stated period.
Do all products from a free trade partner country qualify?
No. Shipping from the country is not the test; meeting the product specific rule of origin is. Goods made there from imported materials may or may not qualify depending on the rule, which is why origin is determined per product, not per country.
How long must I keep origin records?
In the United States, entry records including origin substantiation generally must be kept for five years from the date of entry. Other jurisdictions set their own periods. Keep the certificate and the production evidence behind it for at least that long, and longer if your agreements or audits require it.