Canadian devs, US clients: W-8BEN-E, no-PE treaty cover, and protective filings

The W-9 email is a trap — send a W-8BEN-E instead

Every new US client onboarding ends the same way: procurement asks for a W-9 before releasing the first invoice. The W-9 is for US taxpayers; signing it misrepresents your status. A Canadian corporation completes Form W-8BEN-E, certifying foreign status and claiming the treaty's business-profits protection. Strictly speaking, fees for development work performed in Canada are not even US-source income — no 30% withholding should apply regardless — but the form is what stops a cautious AP system from withholding anyway. It remains valid until the end of the third calendar year after you sign, so a growing consultancy should keep a dated register of which client holds which version.

Match the form to the payee. If the contract is with you personally, it is a W-8BEN, and the income lands on your T1 — your corporate planning quietly breaks. Platforms such as Upwork, Toptal, and Deel collect these forms at onboarding, and a mismatch between the account holder and the entity that invoices is the usual cause of blocked payouts or surprise withholding reported on a 1042-S.

No PE means no US income tax — so know what creates a PE

Under Article VII of the treaty, your corporation's business profits are taxable only in Canada unless it operates through a US permanent establishment. Coding from Brampton for a San Francisco client creates none. The traps are physical and human: an office or other fixed place of business in the US, a dependent agent who habitually concludes contracts there, or the services PE rule — providing services in the US for 183 days or more in any twelve-month period on the same or a connected project. Occasional onsite sprints and conference trips are fine; a long onsite secondment is how a one-person corp accidentally becomes a US taxpayer. We keep a day log for every client who travels, because the test is counted in days, not intentions.

Protective filings: cheap insurance that scales with your invoices

With no PE, your corporation owes no US federal income tax and is not obliged to file. We still routinely file a protective Form 1120-F with a Form 8833 treaty disclosure, for two reasons. First, a foreign corporation that files too late — generally more than 18 months past the deadline — can lose the right to claim deductions if the IRS later decides it did have taxable US business, meaning tax on gross revenue rather than profit. Second, failing to disclose a treaty-based position carries a penalty of its own: $1,000 for individuals and $10,000 for corporations. Against six figures of annual US billings, a protective return is the cheapest risk transfer available. It also creates the paper trail that recovers any 1042-S withholding a platform took in error.

The Canadian half: USD revenue, zero-rated HST, and the PSB shadow

Cross-border does not thin out your Canadian obligations. USD invoices convert at the exchange rate when earned, and the FX gain or loss between invoice and collection is real income or expense in the corp. Services exported to non-resident, non-registered clients are zero-rated for GST/HST — you still register once worldwide taxable supplies pass $30,000, charge 0% to US clients, and claim input tax credits on your Canadian costs, which usually turns each return into a small refund. And a corporation with one US client for years looks to CRA exactly like a corporation with one Canadian client: the personal services business rules do not care where the client lives. Multiple clients, your own equipment, and control over how the work is done matter more than the border. Our IT consultant tax services page covers the T2 and PSB defence in depth.

Going W-2 mid-year: the clean-exit checklist

A TN or H-1B offer changes your personal tax residence, not just your job. Leaving Canada triggers a deemed disposition of most property at fair market value on your departure date — unrealized gains on the corp's shares and taxable investment accounts get taxed, with exceptions for things like RRSPs and Canadian real estate — plus Form T1161 reporting when departing property tops $25,000. The corporation left behind needs its own plan: retained earnings paid out before departure are Canadian dividends; paid after, they face Part XIII withholding at the treaty rate. Sequencing the final invoices, the dividend, and the departure date is worth real money, and it only works if it happens before the start date, not at tax time.