Short answer: Document origin with a supplier affidavit for every SKU, backed by production records showing where substantial transformation happened. Keep the records for five years from entry. The brands that survive audits are the ones whose files answer the auditor's questions before they are asked.
Why origin is under the microscope
Country of origin determines which duty rate applies, whether Section 301 or 232 duties stack on top, and whether preferential claims under trade agreements are valid. When duty rates diverge sharply by country, the incentive to misdeclare origin rises, and CBP knows it. Origin verification has become one of the agency's highest audit priorities.
For DTC brands, the risk concentrates in a familiar pattern: design in one country, components from several others, assembly somewhere else. The question CBP asks is not where the idea came from or where the most expensive component was made. It is where substantial transformation occurred: where the goods became a new and different article of commerce.
Transshipment scrutiny adds pressure. Goods routed through third countries to obscure their true origin are a major enforcement target. Even legitimate multi-country supply chains can look suspicious if the documentation does not clearly show what happened at each stop.
What substantial transformation requires
The legal test is whether manufacturing or processing in a country created a new article with a new name, character, or use. Cutting fabric and sewing a garment qualifies. Repackaging a finished product does not. Simple assembly of components can go either way depending on the complexity and the value added.
For each SKU, you should be able to state the origin-determining operation in one sentence and back it with records. If the sentence is "assembled in Vietnam from Chinese components," you need the Vietnamese factory's production records, not just the invoice. If the sentence is vague, the origin claim is vulnerable.
Watch the de minimis processing trap. Minor operations like labeling, sorting, or repackaging do not confer origin, no matter how much they cost. Brands that moved final packaging to a low-duty country to claim its origin have learned this the expensive way.
The document package auditors expect
Start with supplier affidavits of origin for every SKU, renewed annually. The affidavit should state the country of origin, describe the manufacturing process, and be signed by someone at the supplier with actual knowledge of production. A purchasing manager's signature on a form they did not read is worse than useless in an audit.
Behind the affidavit, keep the production records: bills of materials showing component origins, factory production orders, and shipping records between production stages. For goods with components from multiple countries, the bill of materials is the document that proves which country's operations were origin-conferring.
For preference claims under free trade agreements, keep the specific certification the agreement requires. Each agreement has its own rules of origin and its own documentation standard. A general statement of origin does not satisfy a specific agreement's certification requirement.
Where DTC brands get tripped up
The most common failure is the single-supplier assumption: the brand asks its trading company where the goods are from, the trading company names the country it shipped from, and nobody asks where they were made. The country of export is not the country of origin. Your affidavit needs to come from the manufacturer, not the intermediary.
The second failure is stale documentation. Supply chains move; the factory that made the product in 2024 may not be the factory making it in 2026. Annual affidavit renewals and change notifications in supplier contracts keep the file current. An affidavit describing a factory you no longer use is an audit liability.
The third is the five-year rule. CBP can audit entries up to five years back, and the recordkeeping requirement matches. Brands that purge old supplier records after two or three years discover the gap at the worst possible moment. Archive, do not delete.
Does marking the product with a country satisfy the documentation requirement?
No. Marking is a separate legal requirement about what the product says, not proof of what is true. The marking must be accurate, and the documentation must support the marking. Getting the marking right without the underlying records still fails an audit.
What happens if the audit finds the origin was wrong?
CBP reliquidates the entries at the correct duty rate and bills the difference, plus interest. If the misdeclaration looks negligent, penalties apply; if it looks intentional, the penalties are severe. Voluntary disclosure before the audit starts can reduce penalties significantly.
Should small brands worry about this or is it an enterprise problem?
CBP audits importers of all sizes, and small DTC brands are actually common targets because their documentation is thinner. The good news is that a small catalog means a small document package. Fifty SKUs with clean affidavits is an afternoon of work and an audit shield.