Which country's tariffs apply to your entry — IEEPA, Section 301, or Section 338 — depends on where CBP says the goods originated, not just where they last shipped from. Here's how that determination actually works, and why it's a separate question from USMCA preference and from origin marking.
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For tariff purposes — deciding whether Section 301 China duties, Section 338 Canada duties, or a given country's IEEPA rate applied to your entry — CBP uses non-preferential country of origin rules: generally the "substantial transformation" test for most products, or a specific tariff-shift test under 19 CFR § 102.21 for textiles and apparel. This is a different legal question from where a product is marked as originating, and a different question again from whether it qualifies for USMCA duty preference.
| Test | What it answers | Legal basis |
|---|---|---|
| Substantial transformation | Which country's Section 301/338 or IEEPA tariffs apply, for most non-textile goods | Case-by-case CBP/court analysis — is there a new name, character, and use after processing? |
| Textile tariff-shift rules | Same tariff-applicability question, but for textile and apparel products specifically | 19 CFR § 102.21 — a defined tariff-shift table, not a case-by-case test |
| Origin marking | What country must be physically marked on the product or its packaging | 19 U.S.C. § 1304; 19 CFR Part 134 |
| USMCA preferential origin | Whether the good qualifies for USMCA duty-free or reduced-duty treatment | 19 CFR Part 182 — regional value content and tariff-shift rules specific to USMCA |
If your product is a textile or apparel item, start with 19 CFR § 102.21 — it's a defined tariff-shift table rather than a subjective test, and it controls over the general substantial transformation analysis for those goods.
For most other goods, CBP and the courts ask whether processing in a given country produced a new article with a different name, character, or use than its components had going in. Simple assembly, repackaging, or minor finishing generally isn't enough on its own.
USMCA-originating status (19 CFR Part 182) answers a duty-preference question, not a Section 301/338/IEEPA applicability question. A good can be USMCA-originating from Canada or Mexico while still carrying a non-preferential country of origin elsewhere for tariff purposes — confirm both separately rather than assuming one answers the other.
Origin marking under 19 CFR Part 134 is a separate compliance requirement from the tariff-origin determination. Review both together so your marking, your entry documentation, and the duty rate you're claiming are all consistent.
For a multi-country supply chain or a borderline processing step, you can request a binding country-of-origin ruling from CBP under 19 CFR Part 177. Published rulings are searchable in CBP's CROSS database for guidance on comparable fact patterns.
No. Section 301, Section 338, and IEEPA tariff applicability turn on non-preferential country of origin (substantial transformation, or the textile tariff-shift rules). USMCA-originating status is a separate determination under 19 CFR Part 182 that only controls USMCA duty-preference eligibility. A product can pass one test and not the other.
CBP and the courts look at whether processing performed in a country resulted in an article with a new name, character, and use compared to its inputs. It's applied case by case rather than through a fixed formula, so borderline cases — multi-country assembly especially — often benefit from a binding ruling request.
Usually yes, but they're governed by separate rules — 19 U.S.C. §1304 and 19 CFR Part 134 for marking, versus the substantial transformation or textile tariff-shift analysis for tariff applicability. Review both rather than assuming a marking decision automatically resolves the tariff question.
Which duties applied to an entry — and therefore which are potentially refundable under CAPE — depends on getting the underlying country-of-origin determination right first. An entry misclassified by origin can carry the wrong duty regime altogether, which changes the refund analysis before CAPE eligibility even comes into play.
Yes — you can request a binding ruling under 19 CFR Part 177. CBP's published rulings are searchable through the CROSS database, which is also useful for researching how CBP has treated comparable products and processing steps.
TariffIQ™ reviews your entry data against the applicable origin tests and flags where your CAPE-eligible IEEPA duties sit — free, in minutes.
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