USMCA rules of origin decide whether goods made in Mexico enter the United States duty free. A product qualifies if it is wholly obtained in North America, made entirely from originating materials, or meets the product-specific rule for its tariff line, which is usually a tariff shift, a regional value content threshold of 60% by transaction value or 50% by net cost, or both. Since 24 July 2026, qualifying also exempts Mexican goods from a 10% US tariff.
We help foreign manufacturers set up production in Mexico, free of charge, and rules of origin decide whether that production makes commercial sense. This is the overview: what qualifies, how the maths works, who certifies, and what it costs to get wrong. Every rule below is cited to the treaty text or to CBP.
(Rules of origin are where trade policy stops being a headline and starts being a bill of materials. The good news is that a spreadsheet can answer the question. The bad news is which spreadsheet.)
Why Origin Is Worth More in 2026 Than It Was in 2024
Qualifying used to save you the ordinary duty rate, which on many manufactured goods is low. It now does something bigger. Since 24 July 2026, Section 301 forced-labor tariffs apply to 60 trading partners, and Mexico sits in the 10% tier with a USMCA exemption.
Read the exemption carefully, because it is conditional on the claim, not on the country. Goods that would qualify but are entered without a preference claim remain subject to the 10% duty. The paperwork is now worth a tenth of the invoice value.
That change is visible in the data. The Dallas Fed reports that about 80% of US imports entered duty free under USMCA by July 2025, up from roughly 50% for goods from Mexico. Companies that had ignored origin for years discovered it in a quarter.
The Routes to Qualifying
Article 4.2 of the agreement sets out how a good becomes originating. Most manufactured goods travel the third route, which sends you to the rule written for your specific tariff line.
| Route | What it means | Who uses it |
|---|---|---|
| Wholly obtained | Grown, mined or produced entirely in North America | Raw materials and agricultural goods |
| Entirely originating materials | Every input already qualifies | Assemblers with a fully regional supply chain |
| Product-specific rule, Annex 4-B | Tariff shift, a value threshold, or both | Nearly every manufacturer |
| Article 4.2(d) | RVC fallback for unassembled goods or same-heading parts: 60% transaction value or 50% net cost | Kits and parts that cannot shift headings |
| De minimis, Article 4.12 | Non-originating materials that fail the shift are allowed up to 10% of transaction value or total cost | The small stubborn components |
All of this is in the text of Chapter 4. Two cautions. De minimis has a list of exceptions in Annex 4-A, mostly food and dairy, and textiles and apparel follow their own rules in Chapter 6 rather than the 10% allowance here. If your product is fabric, assume nothing from this article.
Regional Value Content, Without the Jargon
Regional value content measures how much of the good’s value is North American. Article 4.5 gives two formulas, and the importer, exporter or producer chooses which to use unless the product-specific rule allows only net cost.
- Transaction value method: RVC = (TV – VNM) / TV x 100, where TV is the transaction value adjusted to exclude international shipping and VNM is the value of non-originating materials, including materials whose origin you cannot prove.
- Net cost method: RVC = (NC – VNM) / NC x 100, where net cost is total cost minus sales promotion, marketing, after-sales service, royalties, shipping, packing and non-allowable interest.
The usual thresholds are 60% under transaction value and 50% under net cost, which is why the two numbers travel together in every summary you read. Net cost is the stricter calculation and the more forgiving threshold, which is the trade the drafters intended.
One practical point that saves arguments later: materials of undetermined origin count as non-originating. A supplier who will not document origin is not neutral in your calculation. They are a cost.
Automotive Is a Different Animal
If you make vehicles or auto parts, the general thresholds do not apply to you. Per the Congressional Research Service summary of the rules, passenger vehicles, light trucks and core auto parts need 75% regional value content, up from 62.5% under NAFTA. Heavy trucks phase up to 70% in 2027.
Two further requirements have no NAFTA equivalent. Seventy percent of a vehicle manufacturer’s steel and aluminum purchases by value must originate in North America. And the labor value content rule requires 40% to 45% of a vehicle’s production by value to be made by workers earning at least US$16 an hour, which is the provision that put Mexican wage levels into a trade agreement.
For a Tier 2 supplier, the practical effect is that your customer’s compliance becomes your paperwork. Expect origin declarations, cost breakdowns and wage attestations to arrive as contract terms rather than requests.
Certification: No Form, Nine Elements, Five Years
There is no USMCA certificate of origin form. CBP states it directly: “Any format is acceptable, provided it contains nine (9) minimum data elements set out in USMCA, Annex 5-A.” The certification can live on a commercial invoice or any other document.
Those nine elements cover who is certifying and in what capacity, their contact details, the exporter, the producer, the importer if known, the description and six-digit classification, the origin criterion, the blanket period if any, and a signed statement accepting responsibility for the claim. A blanket certification can cover up to 12 months of shipments.
- Who can certify: the importer, the exporter or the producer. The signature carries the liability, so decide deliberately which of the three signs.
- Records: importers keep them for no less than five years from importation, and certifiers for five years from the date of the certification.
- Missed the claim: you may apply for preference and a refund within one year of importation.
Those three rules come from Articles 5.2, 5.8 and 5.11 of the agreement’s origin procedures chapter. The one-year window is the most commercially useful sentence in the chapter, and the least known.
How This Interacts With Your IMMEX Program
These are two separate systems and manufacturers in Mexico live inside both. IMMEX governs how materials enter Mexico duty free for export production, and is explained in our guide to how maquiladora programs work under IMMEX. USMCA governs whether the finished good enters the United States duty free.
A plant can be flawless on one and fail the other. Importing Asian components temporarily under IMMEX is perfectly legal and does nothing to help your regional value content, because those components are non-originating wherever they entered from. Assembly in Mexico is not origin. It is geography.
This is why supplier selection and site selection belong in the same conversation. A plant placed near regional suppliers starts the calculation closer to the threshold, which is one of the things our site selection work scores before a lease is signed.
Test Your Product Before You Sign a Lease
Rules of origin are answerable in advance, on paper, before any capital is committed. This is the sequence we run with clients, and it takes days rather than months.
- Classify the finished good. Get the six-digit heading right first, because every rule hangs off it.
- Read the rule for that line in Annex 4-B. Note whether it offers a tariff shift, a value threshold, or both.
- Tag the bill of materials. Mark each input originating, non-originating, or undetermined, and treat undetermined as non-originating.
- Run both formulas. Transaction value and net cost rarely give the same answer, and you may choose unless the rule says net cost only.
- Check your de minimis headroom. If a component fails the shift, see whether it fits inside the 10% allowance.
- Fix the gap with sourcing, not hope. Moving one non-originating component to a regional supplier is usually cheaper than paying the duty for five years.
Do this before the lease, not after the first shipment. The analysis costs a week; discovering the answer at the border costs a product line.
What Changed at the 2026 Review
The mandatory joint review happened on 1 July 2026 and the United States declined to extend the agreement for a further sixteen years. As Baker Donelson records, USTR Jamieson Greer confirmed the United States “did not agree to renew USMCA in its current form.”
Non-renewal is not termination. The agreement stays fully in force, moves to annual reviews, and runs to 2036 unless a party withdraws on six months’ notice. Nothing about the rules above changed on that date.
What it does change is your planning horizon, because rules of origin and regional value content are explicitly on the table. The same firm puts the risk plainly: “Supply chains that comply under current standards may no longer qualify if the parties adopt more restrictive rules.” Build headroom above the threshold rather than landing exactly on it.
Frequently Asked Questions
What are USMCA rules of origin?
They are the criteria that decide whether a good made in North America qualifies for duty-free treatment. A good qualifies if it is wholly obtained, made entirely from originating materials, or satisfies the product-specific rule for its tariff line in Annex 4-B.
What is the regional value content threshold?
Commonly 60% using the transaction value method or 50% using net cost, though the exact requirement comes from the rule for your tariff line. Passenger vehicles, light trucks and core auto parts require 75%.
Does assembly in Mexico make a product originating?
No. Assembly alone does not confer origin. The product must meet the tariff shift or value requirement in its product-specific rule, and non-originating components count against it regardless of where they were assembled.
Is there an official USMCA certificate of origin form?
No. Any format works as long as it contains the nine minimum data elements in Annex 5-A, and it can appear on an invoice. The importer, exporter or producer may certify.
What happens if I forget to claim USMCA at importation?
You can file a post-importation claim and seek a refund of the excess duties within one year of the date of importation.
How long must I keep origin records?
At least five years: importers from the date of importation, and certifiers from the date the certification was completed.
Rules of origin decide whether a Mexican plant is a tariff advantage or an expensive detour, and the answer is knowable before you commit. Send us your product and your bill of materials and we will walk the rule for your tariff line with you, free of charge.
