Ask most importers how their HTS codes were chosen and you get one of three answers. The supplier provided them. The broker set them up at onboarding. Or nobody actually knows. None of those is a classification decision, and defaults are how sellers end up paying the wrong rate for years in either direction.
We capture the product data that correct classification depends on, at the point where it is generated. Materials, fibre content, construction, weights and dimensions, recorded at intake in Shenzhen and kept consistent across every shipment, so the decisions your customs broker makes are built on facts rather than guesses.
Some categories are far more error prone than others, because the code turns on a physical detail that never appears on a commercial invoice. Here is where we see it most.
Garments are classified by fibre content, construction and gender, and the thresholds are precise rather than approximate. Whether a blend crosses 50% of one fibre can change the heading. Knit and woven go to different chapters entirely. The usual failure is simple: the tech pack says 60/40, production drifts to 48/52, and nobody tells the person choosing the code because nobody realises that person exists.
Chapter 64 turns on the constituent material of the upper, the material of the outer sole, whether the upper covers the ankle, and in some headings the value per pair. Constituent material is determined by greatest external surface area, which is frequently not what a designer would name as the main material.
Under GRI 3(b) a set put up for retail sale is classified by the component giving it essential character, and the whole set can take that component’s rate. The same items shipped loose and shipped as a retail set are different classification questions, which is worth settling before you commit to kitting and bundle assembly at source.
A persistent problem in electronics and machinery. Section and chapter notes frequently exclude parts from the heading covering the machine and direct them elsewhere. Whether something is a part, an accessory, or a standalone article with its own heading changes the answer, and the notes govern rather than common sense.
Your supplier puts a code on the invoice because a field requires one, and is not exposed to US penalties. Your broker files what you instruct and does not have your spec sheets. CBP has no reason to tell you that you have been overpaying. So the error compounds silently, in whichever direction it happens to point.
Most money lost to classification is lost to plain error rather than missed cleverness. Before anything cleverer, rank your products by duty actually paid over twelve months, take the top ten, and try to write down why each code is right. What you cannot justify in writing is what to fix.
Tariff policy moved twice this year. The Supreme Court struck down one regime in February and a replacement took effect in July. These rates are current as at 31 August 2026 and should be verified before you price anything.
The Supreme Court ruled 6 to 3 on 20 February 2026 that IEEPA does not authorise the President to impose tariffs. Every IEEPA tariff fell with it. CBP has been processing refunds since, and by 31 July 2026 around $128.68 billion had been accepted for processing. If you imported during that window, it is worth checking whether you are owed money.
Section 301 duties were unaffected by the ruling and have survived court challenge repeatedly. They attach by HTS code, so your classification decides not only your base rate but which list you fall into, and therefore whether you pay 7.5% or 25% on top. Planning on the assumption they will disappear is not a plan.
| Layer | Rate on Chinese goods |
|---|---|
| MFN base duty, set by HTS code | 0–37.5% |
| Section 301, 2018 Lists 1–3 | 25% |
| Section 301, 2018 List 4A | 7.5% |
| Section 301, forced labour (24 Jul 2026) | 12.5% |
| Section 232, where applicable | 25–50% |
| IEEPA tariffs | Struck down 20 Feb 2026 |
| Section 122 surcharge | Expired 24 Jul 2026 |
Illustrative only. Actual liability depends on your specific HTS classification, country of origin rules, and current trade policy. Verify before relying on these figures. Our landed cost guide walks through the arithmetic.
Tariff engineering is designing a product so that it lawfully falls under a better classification. CBP itself describes it as the longstanding principle that an importer has the right to fashion merchandise to obtain the lowest rate of duty. The line is where the imported condition stops being real.
Sugar refiners produced sugar in darker colours because the tariff was keyed to colour. The Supreme Court was unimpressed by the evasion argument: has not a manufacturer a right to make his goods as he pleases? If Congress writes a tariff that turns on colour, it has told manufacturers that colour is what matters.
Drilled but unstrung pearls attracted 10% duty against 60% for strung pearls. The evidence showed plainly they were designed, marketed and imported to be strung into jewellery. The Court still held they were classifiable as unstrung, because that was their condition at import.
Felt applied to the outsole changes the classification under the footwear headings. The felt is really there, the shoe functions with it, and consumers buy it in exactly the condition it was imported. Nothing is removed at the port.
Vans imported with a second row of seats and declared as passenger vehicles at 2.5% rather than cargo vehicles at 25%. After clearance and before leaving the port, the seats were removed. CBP called it an improper artifice or disguise. The Court of International Trade found for Ford, the Federal Circuit reversed, and Ford settled for $365 million.
Does the product function as imported? Does the customer receive it in that form? Would it survive full written disclosure to CBP? Is there a commercial reason beyond duty? If the change were reversed after clearance, would the product be materially different? Flinch at any of the first three and stop.
Under 19 USC 1592 the statutory maximums are 20% of the domestic value of the merchandise for negligence, 40% for gross negligence, and the full domestic value for fraud, on top of unpaid duty and interest. Negligence means a failure to exercise reasonable care, which is a hard argument to win if nobody documented how a code was chosen.
Classification decisions are only as good as the product information behind them, and that information is generated at the factory and the warehouse rather than in a spreadsheet. That is the part we own.
Materials, fibre content, construction, weights and dimensions recorded when goods arrive, not reconstructed later.
Declared values and product descriptions kept aligned shipment to shipment, so nothing contradicts anything.
When a supplier quietly substitutes a subcomponent, being at the factory end of the chain is where it gets noticed.
Complete commercial invoices and export documentation prepared correctly before goods move.
Records held and retrievable, supporting the five year retention obligation that sits with you as importer of record.
What we are not. We are not a licensed customs broker and we are not trade counsel. We do not sign your entries, we do not assume importer of record responsibility, and we would be wary of anyone who offers to. For a classification you intend to rely on, for first sale valuation, for a binding ruling request, or for anything that has already become a dispute with CBP, engage a licensed customs broker or a trade attorney. We work alongside them regularly and the combination works well. Our tariff management service is built to feed them accurate data, which is usually the part that is missing.
Three guides covering the case law, the audit method, and how to get a documented answer out of CBP rather than an opinion.
The full case law. Merritt, Citroen, Converse and Ford read side by side, the five part test in detail, and what lawful engineering realistically looks like for consumer goods coming out of China.
How the six General Rules of Interpretation actually decide, the category traps in detail, and a practical half day method for auditing the codes you are already using.
Searching CROSS properly, what to put in an eRulings request, realistic timelines, when it is worth requesting, and the catch that a ruling binds you as well as CBP.
Send us your top products by duty paid. We will tell you what attributes we can verify at intake, what is missing from your current documentation, and what your broker would need to classify them properly.
No commitment. No credit card. We will also tell you plainly when the answer needs a licensed broker rather than us.