El Paso Nearshoring Build and the Mexican CUSMA Inputs Entering Canada

Key Takeaways

• New industrial capacity in El Paso and northern Mexico means more U.S.–Mexico co-production, which directly affects CUSMA origin eligibility for goods entering Canada.
• If your CAD claims CUSMA tariff treatment on goods assembled in the U.S. but sourced from Mexico, HS 6-digit classification and regional value content documentation must be airtight.
• CBSA origin verifications are more common when suppliers change or manufacturing splits across the border mid-year.
• Work through CUSMA origin eligibility before the first shipment lands; post-clearance corrections are possible under section 59 of the Customs Act but add delay and cost.

El Paso capacity and what it means for Canadian importers

An 800,000-square-foot industrial building under construction in El Paso is a visible marker of nearshoring momentum along the U.S.–Mexico border. Manufacturers are moving production closer to North American markets, and much of that capacity sits within a few hours of the border crossings that feed Canadian import volumes.

For Canadian importers, the practical question is not where the facility is built but what crosses the border afterward. If your supplier assembles goods in the U.S. using Mexican components, or if a Mexican plant ships through El Paso and then north to Canada, CUSMA origin claims become a line item on every Commercial Accounting Declaration.

The CBSA checks origin documentation more carefully when supply chains shift mid-year. A new sub-supplier in Chihuahua or Monterrey can change the regional value content calculation or trigger a different tariff-shift rule. If the CAD claims CUSMA tariff treatment and the Certificate of Origin no longer matches the production reality, the importer owes the full MFN duty plus interest.

CUSMA origin claims and Mexican inputs

CUSMA (the Canada–United States–Mexico Agreement) replaced NAFTA in 2020. The regional value content thresholds are higher, the tariff-shift rules are more granular, and the documentation burden is stricter. Most industrial goods must meet 75% regional value content under the net-cost method, as specified in CUSMA Article 4.5.

When a U.S. supplier uses Mexican steel, fasteners, motors, or sub-assemblies, you need a full bill of materials and a regional value content worksheet to support the CUSMA claim. The HS 6-digit classification determines which tariff-shift rule applies. If non-originating materials do not undergo the required change in classification during production, the finished good does not qualify.

We see importers miss this when the U.S. exporter provides a blanket Certificate of Origin but changes suppliers partway through the year. The blanket cert is valid for 12 months, but it must reflect the current production details. If the supplier adds a Chinese motor or a Vietnamese casting without updating the certificate, the CUSMA claim is invalid from that shipment forward.

HS classification and tariff treatment

The HS 6-digit heading drives both duty liability and origin eligibility. If CBSA disagrees with your classification, the tariff-shift rule may no longer be satisfied, and the CUSMA claim fails even if the regional value content is sufficient.

Common classification disputes we file CADs against:

• Electric motors and assemblies under HS 8501 versus complete machines under Chapter 84 or 85
• Steel fabrications under HS 7308 versus finished equipment under the end-use chapter
• Fasteners, fittings, and hardware classified by material versus function

If your supplier's commercial invoice uses a vague product description or an incorrect HS code, fix it before the first shipment. CBSA origin verifications are more common when the HS code on the Certificate of Origin does not match the CAD, or when the exporter's documentation shows a recent change in sourcing.

Our HS classification service walks through the bill of materials, assigns the correct HS 6-digit heading, and applies the corresponding CUSMA tariff-shift rule. That work happens before the goods leave the supplier, not during a CBSA verification six months later.

CBSA origin verification process

When CBSA questions a CUSMA claim, it issues an origin verification letter under Chapter 5 of the agreement. The importer has 30 days to respond with the Certificate of Origin, the RVC calculation, and supporting supplier declarations, per D-memorandum D11-4-20.

If the importer cannot provide complete documentation, CBSA contacts the exporter or producer directly. The verification can take 90 to 180 days. During that time, CBSA may request:

• Purchase orders and supplier invoices for non-originating materials
• Production records showing where each manufacturing step occurred
• Accounting records to substantiate the net-cost calculation
• Correspondence with sub-suppliers confirming country of origin

If CBSA denies the claim, the importer owes MFN duty plus interest from the original release date. If the claim was not filed in good faith, AMPS penalties apply under contravention K011, starting at CAD 400 for a first infraction and rising to CAD 25,000 for repeat contraventions.

We manage CBSA origin verifications for clients filing dozens of CADs per month. The response package includes the RVC worksheet, supplier declarations, and a narrative explanation of the production process. Most verifications close within 60 days when the documentation is complete.

Retroactive CUSMA claims and corrections

If you paid MFN duty at release because the supplier had not yet provided the Certificate of Origin, you can file a retroactive CUSMA claim under section 59 of the Customs Act. The correction window is four years from the date of release.

You submit the Certificate of Origin, the RVC calculation, and an amended CAD through the CARM Client Portal. CBSA processes the adjustment and issues a refund if the claim is valid. Processing typically takes 30 to 60 days, and the importer receives interest on the overpaid duty.

Retroactive claims are common when a U.S. supplier waits until the end of the quarter to finalize RVC calculations or when a Mexican producer delays submitting supplier declarations. The correction itself is straightforward, but the importer must still meet the same documentation standard as an original claim.

If your supplier changes sourcing mid-year, review the CUSMA eligibility before filing the next CAD. A new Mexican sub-supplier may push the RVC below 75%, or the tariff-shift rule may no longer be satisfied. Work through the math before the goods arrive, not after CBSA issues a verification letter.

Cross-border assembly and warehouse staging

Some importers bring goods into the U.S. from Mexico, perform light assembly or kitting in El Paso or another border city, and then ship north to Canada. The Canadian CAD must reflect the actual country of origin and the correct tariff treatment.

If the U.S. assembly step is substantial enough to change the HS classification, the goods may qualify as U.S. origin under CUSMA. If the assembly is minor, the goods remain Mexican origin. The tariff-shift rule and RVC calculation determine which applies.

When goods stage in a U.S. warehouse before crossing into Canada, the commercial invoice and packing list must match the final configuration. We see delays when the U.S. warehouse re-palletizes or re-labels shipments but does not update the paperwork. CBSA cargo control and PARS pre-arrival data must match the physical load at the border.

For importers running cross-dock or light assembly in Montreal or the Greater Toronto Area, FENGYE LOGISTICS handles inbound staging and preparation before customs release. The facility holds goods under CBSA bond when origin documentation is incomplete, and coordinates release prior to payment once the CAD is filed.

Final documents and supplier coordination

A CUSMA origin claim requires coordination between the importer, the exporter, and any sub-suppliers providing non-originating materials. The Certificate of Origin must be completed by the exporter or producer and provided to the importer before the CAD is filed.

The certificate includes:

• Exporter and producer name and address
• HS 6-digit classification
• Origin criterion (A, B, C, or D)
• RVC percentage if criterion B applies
• Blanket period if covering multiple shipments

If the exporter cannot provide the certificate in time for release, the importer can file the CAD under MFN duty and submit a section 59 correction later. That approach avoids release delays but adds administrative cost and a 30- to 60-day wait for the refund.

Most U.S. exporters are familiar with CUSMA documentation, but Mexican producers sometimes provide certificates that do not meet CBSA requirements. Common issues include missing RVC calculations, incomplete blanket periods, and vague origin criteria. Review the certificate before the first shipment and request corrections early.

Our customs compliance service includes supplier onboarding, certificate review, and RVC validation. We catch documentation gaps before the goods arrive and coordinate corrections with the exporter. That work prevents verification letters and AMPS penalties six months later.

Nearshoring will continue to shift production within North America. For Canadian importers, the question is not where the factory sits but whether the goods qualify for CUSMA treatment when they cross the border. If you are adding Mexican suppliers or receiving U.S. assemblies with Mexican inputs this year, walk through the origin math now. Get in touch.

Frequently Asked Questions

Does nearshoring in Mexico affect CUSMA claims for Canadian importers?

Yes. If a U.S. supplier uses Mexican components, the finished good must meet CUSMA regional value content and tariff-shift rules to qualify for duty-free entry into Canada. CBSA verifies origin under Chapter 5 of the CUSMA agreement, which requires detailed supply-chain documentation.

What is the minimum regional value content threshold for CUSMA goods?

Most industrial goods require 75% regional value content under the net-cost method, as defined in CUSMA Article 4.5. Automotive products face additional thresholds. CBSA will request the full RVC calculation during an origin verification.

How long does a CBSA CUSMA origin verification take?

CBSA allows 30 days for the importer to respond to an origin verification letter, per D11-4-20. If documentation is incomplete, the verification can stretch 90 to 180 days while CBSA contacts the exporter or producer directly.

Can I file a CUSMA claim retroactively if I paid MFN duty at release?

Yes. Section 59 of the Customs Act allows correction of tariff treatment within four years. You submit a Certificate of Origin and RVC calculation with the amended CAD. Processing typically takes 30 to 60 days, and CBSA will issue a refund if the claim is valid.

What happens if CBSA denies my CUSMA origin claim?

The importer owes MFN duty plus interest from the date of release. If the claim was not filed in good faith, AMPS penalties under contravention K011 may apply, ranging from CAD 400 to CAD 25,000 depending on the correction history.

Do I need a new Certificate of Origin every time my U.S. supplier adds a Mexican sub-supplier?

Yes, if the new sourcing changes the HS classification or regional value content. The certificate must reflect the current production details. Blanket certificates are valid for 12 months but must be updated whenever material facts change.

How does HS classification interact with CUSMA origin?

CUSMA tariff-shift rules require that non-originating materials undergo a specified change in HS classification during production. The HS 6-digit heading determines which tariff-shift rule applies. Misclassification invalidates the origin claim even if RVC is sufficient.

Can CanFlow Global help with CUSMA origin reviews before the first shipment?

Yes. We review supplier certificates, calculate regional value content, and file the CAD with the correct tariff treatment code. If CBSA initiates an origin verification later, we manage the response and compile the RVC worksheet.

Originally published at https://www.canflow-global.com/en/insights/el-paso-nearshoring-build-and-the-mexican-cusma-inputs-entering-canada/.