Transfer Pricing for Small Cross-Border Companies: the Arm's Length Rule, the T106 and 5472 Forms, and the File That Keeps Both Sides Calm

Short version: Form T106 Explained: Related-Party Non-Resident Deals

Transfer pricing sounds like multinational territory, and its rules attach the day a dentist's Ontario corporation starts billing her Delaware corporation for management services. The principle is single and shared: related parties must transact at arm's length prices — what independent parties would have charged — with each country empowered to adjust income where they didn't, and penalties layered for adjustments unsupported by contemporaneous documentation. The disclosure architecture makes small structures visible: Canada's Form T106 reports a corporation's non-arm's-length transactions with non-residents annually once the de minimis threshold is crossed (total reportable transactions with all non-residents combined of more than C$1,000,000) — categories, amounts, counterparties, and whether contemporaneous documentation exists (the checkbox that functions as an invitation); the US's Form 5472 attaches to the US corporation's return (and to the foreign-owned disregarded entity, which is how single-member LLCs of Canadians acquired a $25,000-penalty filing) reporting the same flows from the American side — and the two filings describing one relationship had better describe it identically. The transactions small structures actually have: management and administrative services (the owner and her Canadian staff supporting the US entity — priced at cost plus a routine markup, the workhorse method for back-office services); intercompany sales of goods (resale-price or cost-plus methods against comparables); the shared owner's own time (allocated by records, priced consistently with what the entities pay her overall — the compensating salary structure and the transfer price being one design); loans and cash management (interest at rates the AFR/prescribed-rate and thin-capitalization rules bracket — the casual interest-free intercompany balance being the most common small-company finding); and IP and brand charges, which small companies should implement cautiously or not at all, since royalty flows attract the most scrutiny per dollar of any category. The documentation standard scales with honesty rather than volume: a contemporaneous file — the intercompany agreement (signed before the year, not reverse-engineered), the method chosen and why, the cost base and markup support, invoices matching the agreement, and the annual true-up memo — runs to a dozen pages for a two-entity structure and converts any future query into correspondence; its absence converts the same query into an adjustment plus Canada's documentation penalty (10% of the adjustment above thresholds) plus the mirror-image double tax that competent-authority relief takes years to unwind. The operating rhythm: set the policy once (methods, markups, rates), paper it, invoice monthly like the related parties were strangers, true up at year-end against actuals, file the T106 and 5472 from the same workpaper, and revisit the policy when the business changes shape — the whole discipline costing a few hours a quarter and functioning, not incidentally, as better management accounting than most small companies otherwise keep.

Key takeaways

• Arm's length is the law on both sides at every size: related-party prices must match what strangers would pay, and each country can adjust — with penalties keyed to documentation — regardless of whether any tax was actually saved.
• The disclosure pair: T106 (Canada, above the de minimis, transaction categories and the documentation checkbox) and 5472 (US corporations and foreign-owned disregarded entities, $25,000 starting penalty) — filed annually, from one shared workpaper, telling one story.
• Small-structure pricing that works: cost-plus routine markups for back-office and management services; comparable-anchored resale or cost-plus for goods; interest on every intercompany balance at defensible rates; the owner's time allocated by records; and IP charges avoided until the structure genuinely needs them.
• Contemporaneous means before, not clever: the agreement predates the transactions, the file predates the query, and Canada's penalty regime turns on that timing — the reverse-engineered study is the expensive kind.
• Cash discipline is transfer pricing: the running intercompany balance nobody papers becomes an interest-free loan both countries can re-price; monthly settlement or documented terms with interest closes the finding before it exists.
• Symmetry is the audit defense: the T106, the 5472, both entities' financials, and the invoices reconcile to the same numbers — the cross-border query that ends quickly is the one where every document already agrees.

The two-entity starter file

For the standard structure — Canadian operating company, US sales or operating company, common ownership — the starter file is five documents: an intercompany services agreement (scope, cost-plus method, markup, settlement terms); a goods or distribution agreement where product flows (method, price-setting mechanics, return terms); a loan agreement template with the rate source for any balances that persist past settlement; the annual pricing memo (this year's cost bases, the markup applied, the comparables sanity-check, the true-up); and the T106/5472 workpaper mapping every reported line to the agreements. Built once with advice, maintained quarterly in-house, refreshed when the business changes — the file is the difference between transfer pricing as background rhythm and transfer pricing as the worst eighteen months the company ever spent.

Worked example

A Kitchener e-commerce founder runs a CCPC (product, team, warehouse) and a Delaware C-corp (US marketplace accounts, US customer contracts). Flows: the CCPC sells inventory to the US entity, provides fulfillment and back-office services, and floated it US$180,000 during launch. The setup year: a distribution agreement prices the goods at cost-plus with a margin benchmarked against the resale economics; a services agreement puts fulfillment and admin at cost plus a routine markup; the launch float converts to a papered loan at a defensible rate with quarterly interest; monthly intercompany invoices settle by wire; the annual memo trues up actuals. Filings: the CCPC's T106 reports the goods, services, and loan categories with the documentation box checked truthfully; the Delaware company's 5472 reports the same flows from its side; the workpaper behind both is one spreadsheet. Year three, the CRA's screening letter arrives — the T106 profile of a growing structure — asking for the documentation: the response is the file, sent in a week; two follow-up questions later the query closes with no adjustment. The founder's counterfactual is her forum-friend's structure — same shape, no agreements, a US$400,000 unpapered balance, prices set by whatever the cash flow needed: his adjustment re-priced three years of services, the documentation penalty attached, and the US side's correlative relief is a competent-authority file entering its second year. The difference was never the businesses; it was five documents and a quarterly hour.

Official sources

"The reporting person has to file the T106 documentation if the amount of the total reportable transactions for all the non-residents combined is more than CAN $1,000,000." The return reports non-arm's length transactions — sales, services, royalties, and loans — with related non-residents. — Canada Revenue Agency, T106 Information Return of Non-Arm's Length Transactions with Non-Residents, https://www.canada.ca/en/revenue-agency/services/forms-publications/forms/t106.html

"A 25% foreign-owned U.S. corporation (including a foreign-owned U.S. disregarded entity (DE)), or a foreign corporation engaged in a trade or business within the United States" files Form 5472; a foreign-owned U.S. DE is "classified as a corporation" for this purpose. "A penalty of $25,000 will be assessed on any reporting corporation that fails to file Form 5472 when due." — Internal Revenue Service, Instructions for Form 5472, https://www.irs.gov/instructions/i5472

Practitioner note

Transfer pricing at small scale is bookkeeping with legal consequences: the methods are simple, the forms are two, and the entire risk concentrates in timing — agreements signed before the year, documentation built before the question. Our two-entity clients get the five-document starter file and a quarterly rhythm, and the payoff shows up twice: once in queries that close by correspondence, and once in management accounts that finally show which entity actually makes the money.

See also: For whether a US citizen in Canada should incorporate, see whether a US citizen in Canada should incorporate; and browse every cross-border tax topic guide, organized by situation · Short version: Transfer Pricing Between Canada and the US: Arm's-Length Prices for Related-Party Transactions, and the Documentation Both Sides Expect.

Next step

Fairlight prepares the transfer pricing setup — the five-document intercompany file, method and markup selection, loan papering, the shared T106/5472 workpaper, and the quarterly rhythm that keeps it contemporaneous. See cross-border pricing or book a call.