CUSMA Rules of Origin for Canadian Importers: What You Need to Know in 2026

The Canada-United States-Mexico Agreement (CUSMA), called USMCA in the US, replaced NAFTA on July 1, 2020. Six years later, it's still the main way Canadian importers reduce duty costs on goods moving between the three countries.

Preferential rates under CUSMA aren't automatic, though. Your product has to qualify under the agreement's rules of origin, and you need documentation to prove it. A valid claim can bring your duty rate to zero. A bad claim brings CBSA penalties under AMPS, plus back-assessed duties with interest.

This guide covers how origin qualification works, what documentation you need, and what the July 2026 triennial review might change.

What CUSMA replaced and what changed

NAFTA governed North American trade for 26 years. CUSMA kept the same basic framework, preferential tariff rates for goods originating in North America, but tightened the rules in several areas:

• Automotive rules of origin raised the Regional Value Content (RVC) threshold from 62.5% to 75%
• Labour value content requirements were added for the first time: 40-45% of auto content must come from workers earning at least US$16/hour
• Steel and aluminum used in auto production must now be "melted and poured" in North America
• De minimis thresholds were adjusted (10% for most goods, 7% for textiles)
• Digital trade provisions were added, though these mostly affect services, not goods importers

For most Canadian SMB importers outside the auto sector, the practical result is that CUSMA preferential rates are still available, but the documentation and verification requirements are stricter than they were under NAFTA.

Origin qualification methods

A product qualifies as "originating" under CUSMA if it meets the product-specific rule of origin (PSRO) for its HS code. PSROs rely on a few different methods, sometimes in combination.

Tariff shift (CC / CTH / CTSH)

The tariff shift test asks whether the manufacturing process changed the product's HS code classification. If non-originating materials enter under one tariff heading and the finished product is classified under a different heading, CUSMA considers that a "substantial transformation."

The levels, from strictest to least strict:

• CC (Change of Chapter): All non-originating materials must come from a different 2-digit HS chapter than the finished product.
• CTH (Change of Tariff Heading): Non-originating materials must come from a different 4-digit heading.
• CTSH (Change of Tariff Subheading): Non-originating materials must come from a different 6-digit subheading.

Say a Canadian manufacturer imports raw steel rod from Germany (HS 7213) and machines it into bolts (HS 7318). The shift from Chapter 72 to Chapter 73 satisfies a CC requirement, so the bolts qualify as originating.

Regional Value Content (RVC)

RVC measures what percentage of a product's value comes from North American sources. CUSMA gives you two ways to calculate it:

• Transaction Value Method: RVC = ((Transaction Value - Value of Non-Originating Materials) / Transaction Value) x 100
• Net Cost Method: RVC = ((Net Cost - Value of Non-Originating Materials) / Net Cost) x 100

The required RVC percentage varies by product. Most goods need 50-60%. Automotive products need 75%.

The transaction value method is simpler but can swing with your sale price. The net cost method strips out royalties, shipping, and packing costs, giving a more stable number. Some PSROs specifically require net cost, so check the rule for your HS code before choosing.

De minimis

De minimis is a safety valve. If your product fails the tariff shift test because a small amount of non-originating material didn't undergo the required change, the product can still qualify, as long as the value of that material doesn't exceed:

• 10% of the transaction value for most goods
• 7% for textiles and apparel (Chapters 50-63)

This doesn't apply to dairy, eggs, or certain agricultural products listed in CUSMA Annex 4-A.

How to determine if your product qualifies

Start with classification. Get the correct 10-digit HS code. Misclassification is the number one reason CUSMA claims get denied, and everything downstream depends on it.

Then look up the PSRO for that HS code in CUSMA Annex 4-B. The rule will tell you which method applies: tariff shift, RVC, or sometimes both.

Next, trace your materials. For each non-originating input, you need the HS classification and value. This feeds both tariff shift analysis and RVC calculations.

Apply the PSRO to your bill of materials and see if it passes. If it does, document the determination, your supplier declarations, and the supporting calculations. Keep all of it for at least five years. CBSA expects these records to be on file when they come asking.

The free CUSMA Impact Calculator can help estimate duty savings from a valid CUSMA claim and identify which qualification method applies to your HS code.

The July 2026 triennial review

CUSMA requires a review of the rules of origin every three years. The first was in July 2023. The second is scheduled for July 1, 2026, and a few things are on the table.

Automotive sector

The 75% auto RVC is expected to stay, but the calculation methodology may change. All three countries want to simplify the "core parts" tracking requirements. These have been administratively painful for smaller auto parts manufacturers since day one.

Steel and aluminum

The "melted and poured" requirement for steel in auto production needs clarification. There's an unresolved disagreement about whether certain semi-finished imports (slab steel rerolled in North America, for example) actually satisfy the requirement.

Environmental goods

There's talk of adding preferential treatment for environmental goods like solar panels and EV charging equipment. Nothing concrete has been published yet, but Canadian industry groups have submitted recommendations.

What importers should do now

If CUSMA claims cover a significant portion of your imports, review your origin determinations before July. Changes to PSROs could knock out products that currently qualify, or open up preferential treatment for products that don't.

Certificate of Origin requirements

To claim CUSMA preferential treatment, you need a valid certification of origin at the time of import. Unlike NAFTA's prescribed CO form, CUSMA allows free form certification, but it must include nine data elements:

1. Certifier information: name, address, telephone, email
2. Exporter information (if different from certifier)
3. Producer information (if different from certifier/exporter)
4. Importer information: name, address, email
5. Product description sufficient to identify the goods
6. HS tariff classification to the 6-digit level at minimum
7. Origin criterion: which PSRO the product satisfies (e.g., "WO" for wholly obtained, "RVC" for regional value content)
8. Blanket period, if the certification covers multiple shipments (up to 12 months)
9. Authorized signature and date

A CUSMA certification of origin is valid for four years from the date of signature. Hold on to it. CBSA can request verification at any time during that window.

Unlike under NAFTA, where only the exporter could issue the certificate, the importer, exporter, or producer can all certify origin now.

When to claim CUSMA vs. when MFN might be simpler

CUSMA claims save money, but they create compliance obligations. Whether the savings justify the effort depends on the product.

If the MFN duty rate is 6% or higher and the CUSMA rate is zero, the math is obvious. Frequent imports of the same product make it even clearer, since you do the origin work once and apply it across shipments. Straightforward PSROs (a clean tariff shift, for instance) keep the compliance burden manageable.

On the other hand, if the MFN rate is already 0-2%, the administrative cost of maintaining CUSMA documentation can exceed what you'd save. The same goes for borderline origin situations where qualification is uncertain, or suppliers who can't provide origin data. For one-off imports, the paperwork rarely pays for itself.

A common and expensive mistake: claiming CUSMA on every import from the US or Mexico without actually verifying origin. Not all goods shipped from the US originate there. A product manufactured in China and transshipped through a US warehouse does not qualify, no matter where your supplier is incorporated.

Watch for surtax interaction

Since March 2025, several active surtax orders apply to goods from the United States. For products covered by the broad US surtax order (SOR/2025-66), a valid CUSMA claim does not exempt you from the surtax. That order was deliberately designed to override CUSMA for the listed items.

There's an exception for motor vehicles under SOR/2025-118, where a valid CUSMA claim does provide a partial reduction in the surtax base.

Before claiming CUSMA on any US-origin import, check whether a surtax order applies using the free Surtax Checker. The duty savings from CUSMA and the surtax liability are calculated separately, and you need to account for both when estimating your landed cost.

Recap

CUSMA can bring your duty rate to zero, but only when the product genuinely qualifies. CBSA has four years to come back and verify your claim, so half-hearted documentation won't cut it. With the triennial review coming in July 2026, revisit your existing origin determinations and confirm they'll hold up if the PSROs change. If you're importing from the US, surtax exposure sits on top of the CUSMA analysis and needs to be calculated separately. The free Surtax Checker and CUSMA Impact Calculator can help with both.