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Selling into the US: origin, warehouse nexus and transfer pricing for manufacturers
A Canadian manufacturer selling into the US runs three tax files at once: proving USMCA origin so tariffs do not eat the quote, keeping a US warehouse from quietly creating state-by-state filing duties, and pricing sales to any US affiliate so neither CRA nor the IRS reprices them later. None of the three is optional at scale, and every one is cheaper handled before the shipment than after the audit.
By the AnalytIQ Accounting team · Last reviewed: August 12, 2026
Origin became a finance function
USMCA duty-free treatment is earned product by product: each good must satisfy its rule of origin — a tariff-shift test, a regional value content threshold (commonly 60 percent under the transaction-value method or 50 percent under net cost), or both. Proving it means bill-of-materials analysis and current origin certifications from the suppliers of your purchased inputs, rolled up into your own nine-data-element certification of origin, kept with six years of records.
The commercial stakes usually exceed the legal ones. A failed origin claim lands first on your US customer as importer of record — retroactive duty, interest, and a supplier they no longer trust. We treat annual supplier re-solicitation and BOM re-testing as a production process, the same as calibration.
The tariff map changes faster than your price list
Two facts define 2026. First, the IEEPA tariffs were struck down by the US Supreme Court in February 2026 and collection stopped — creating refund positions on US entries that paid them. Second, Section 232 tariffs of 50 percent on steel, aluminum and copper, including long derivative-product lists, remain in force and apply regardless of USMCA qualification. New sectoral actions can appear with days of notice, as the August 2026 measures on certain Canadian goods showed — some reaching goods that are fully USMCA-compliant.
The planning answer is structural, not reactive: know the 10-digit classification of everything you ship, know which lists it sits on, decide deliberately who acts as importer of record under your Incoterms, and carry duty as a quoted, quarterly-reviewed cost instead of an annual surprise.
A US warehouse fixes lead times — and creates nexus
Under Article V of the treaty, a facility used only for storage, display or delivery is generally not a permanent establishment, so stocking a US 3PL does not by itself trigger US federal income tax. Claim that position rather than assuming it: a protective Form 1120-F with a Form 8833 disclosure preserves your deductions if the IRS ever disagrees. Hire a US-based salesperson who concludes contracts, and the federal answer starts changing.
States are not bound by the treaty. Inventory on a state's soil commonly creates income or franchise tax obligations there, and post-Wayfair economic nexus — around US$100,000 of sales in most states — forces sales tax registration even with no physical presence. Distributor sales stay exempt only with resale certificates actually on file. The ladder looks like this.
| US footprint | US federal income tax | State exposure |
|---|---|---|
| Ship from Canada, no US presence | None under the treaty; W-8BEN-E to customers, protective 1120-F worth considering | Sales tax only where economic thresholds are crossed |
| Inventory in a US 3PL | Still treaty-protected as storage and delivery; protective 1120-F recommended | Sales tax registration; possible income or franchise filings where the stock sits |
| US sales employees or dependent agents | Permanent-establishment risk — attributable profits become taxable on the 1120-F | Payroll, income and sales tax follow the people |
| US subsidiary | Sub files its own Form 1120 with Form 5472 | State returns where it operates; transfer pricing governs the margin |
Transfer pricing starts earlier than you think
The day a US sales subsidiary exists, section 247 requires the intercompany price to be arm's length — and the paperwork has deadlines of its own. Contemporaneous documentation must exist by your T2 filing due date, T106 slips are required once transactions with related non-residents pass CA$1 million, and adjustments beyond the lesser of $5 million and 10 percent of gross revenue attract a 10 percent penalty that documentation would have avoided. The CanCo also reports the sub annually on T1134.
For most manufacturer-distributor pairs the defensible answer is simple: benchmark the distributor margin, write the policy down, and apply it consistently. Remember the border sees the same number from the other side — customs wants the price no lower than arm's length while income tax wants it no higher — a tension we manage jointly with the customs file described on our importer cross-border page.
Put the border in the budget
Our rhythm for exporting manufacturers is annual and boring on purpose: origin re-certification before renewal season, a nexus survey against the year's shipping and hiring, the transfer pricing memo refreshed with the T2, and duty and FX assumptions rebuilt into standard costs — work that runs alongside manufacturer CFO services, with the treaty and filing depth at cross-border tax services.
Source: CRA — Form T106, Information Return of Non-Arm's Length Transactions with Non-Residents.
Common questions.
Does inventory in a US 3PL make us pay US income tax?
Federally, generally no — the treaty protects storage and delivery facilities, and a protective 1120-F with Form 8833 locks that position in while preserving deductions. States are different: expect sales tax registration and, in some states, income or franchise filings wherever stock sits.
When do we actually need transfer pricing documentation?
The arm’s-length standard applies from the first intercompany sale. T106 reporting starts once related non-resident transactions pass CA$1 million, and contemporaneous documentation prepared by the T2 filing deadline is what shields you from the 10 percent penalty on adjustments.
Our goods qualify under USMCA. Can tariffs still hit them?
Yes. Sectoral measures — including the 50 percent Section 232 tariffs on steel, aluminum, copper and their derivative lists — apply regardless of origin. USMCA qualification eliminates ordinary duty; classification decides sectoral coverage.
Related reading
Margin protected at the border.
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