Regulation 105: the 15% Canada Withholds When Non-Residents Perform Services Here — and the Waiver That Turns It Off

Short version: Regulation 105 Waiver Explained: Form R105

Regulation 105 is Canada's insurance policy on non-resident service providers: rather than hope a US consultant files a Canadian return for their Toronto engagement, the system makes the Canadian payer withhold 15% of the fee at source and remit it, with a T4A-NR slip reporting the payment and withholding after year-end. Three features define how it actually operates. It is triggered by geography, not residency of the payer or currency of the invoice: fees, commissions, and similar amounts for services rendered in Canada — the US firm's engineers commissioning an Alberta plant, the American keynote at a Vancouver conference, the Michigan contractor's crew on a Windsor job — all inside; the same providers working from home in the US, entirely outside (the mirror principle the contractor articles run on). It is on account, not final: the 15% is a prepayment against whatever Canadian tax the non-resident ultimately owes — which, for a treaty-protected provider with no Canadian permanent establishment, is typically zero — so the withheld amounts come back through the non-resident's Canadian filing (a treaty-based return reporting the income, claiming the exemption, and refunding the withholding), a recovery that works reliably and slowly. And it is waivable in advance: the CRA's waiver process lets a non-resident apply — on treaty grounds (no PE, income not taxable in Canada) or on income-and-expense grounds (the withholding would exceed the ultimate tax) — for authorization to be paid gross; waivers are engagement-specific, want lead time measured in weeks, and are the difference between financing the CRA for a year and never involving them at all. The payer's exposure is what gives the regime teeth: a Canadian payer who fails to withhold is liable for the amount plus penalties and interest — which is why Canadian companies' vendor-onboarding asks where services will be performed, why waivers get demanded before gross payment, and why the discovered-after-the-fact visit gets remitted late with penalties rather than ignored. Around the core sit the practical mechanics: proration where an engagement spans both countries (the withholding attaches to the in-Canada portion, supported by day logs and fee allocations in the contract); the separate acting-industry regime and the higher rate on certain film payments; GST/HST's independent analysis on the same invoice; and the provider's own follow-through — the Canadian return that recovers the withholding, or the waiver renewals for the recurring engagement, or (for providers who genuinely owe Canadian tax on a PE) the withholding's application against the real liability it was always securing.

Key takeaways

• The trigger: services physically rendered in Canada by a non-resident — 15% of the fee withheld and remitted by the payer, T4A-NR issued. Where performed is the whole test; remote work from abroad is outside the regime entirely.
• On account, not final: treaty-protected, PE-less providers get it back by filing a Canadian treaty-based return — recovery is real, slow, and paperwork-priced; providers with actual Canadian tax liability see it credited against the real bill.
• The waiver prevents the whole cycle: treaty-based or income-and-expense-based applications, engagement-specific, filed weeks ahead; the standard tool for planned visits, tours, and project work by providers with clean no-PE facts.
• Payer liability drives behavior: failure to withhold lands on the Canadian payer with penalties — vendor onboarding should ask the performance-location question, contracts should allocate fees to locations, and discovered visits get remitted promptly rather than buried.
• Proration is legitimate and documented: mixed engagements withhold on the in-Canada slice — day logs, deliverable allocations, and contract language carry the split; round-number allocations invented at audit time do not.
• Adjacent regimes ride the same invoice: GST/HST (the non-resident supplier and place-of-supply analysis), payroll-versus-contractor characterization for anyone who looks like staff, and the provider's own US-side treatment of the eventual refund — each analyzed on its own rules.

Both sides' checklists

The Canadian payer: performance-location question at vendor setup; withholding coded into AP for in-Canada service vendors absent a waiver on file; remittance on schedule and T4A-NRs in February; contract clauses allocating fees for mixed engagements. The non-resident provider: price the regime into Canadian work (cash-flow, not cost, for the treaty-protected); apply for waivers early on planned engagements — and renew them, since they don't roll forward; keep the day and deliverable logs that support allocation; file the Canadian recovery return the spring after any withheld year, because the refund has a limitation clock and no one else is watching it; and fold the Canadian filings into the home-country return's credit analysis correctly — refunded withholding is not a foreign tax credit, a coordination error that quietly double-counts.

Worked example

A Chicago engineering firm signs a US$400,000 commissioning contract for an Ontario plant: US$260,000 of design work performed in Chicago, US$140,000 of on-site commissioning over nine weeks in Canada. Without planning: the Canadian payer withholds 15% of the US$140,000 (US$21,000), remits, and issues a T4A-NR; the firm — no Canadian PE, fully treaty-protected — files a Canadian treaty-based corporate return the following year and recovers the US$21,000 about fourteen months after the work. With planning, which is what actually happens: the contract allocates the fees by location with a day-log mechanism; the firm applies for a Regulation 105 treaty-based waiver six weeks before mobilization, supported by the no-PE analysis (nine weeks, one project, no fixed place — comfortably inside the treaty's thresholds); the waiver issues; the payer pays gross with the waiver in its file, fully protected; and the firm's only Canadian follow-through is the waiver's paper trail. The same month, the payer's AP team catches an unplanned two-day visit by a different US vendor — US$9,000 of on-site troubleshooting nobody flagged: 15% is withheld from the final invoice, remitted with the month's batch, the T4A-NR calendared, and the vendor briefed on the recovery filing — the small, correct, slightly annoyed version of compliance that the waiver process exists to spare everyone at scale.

Official sources

"As a payer, you have to withhold 15% from fees, commissions or other amounts that you pay to non-resident individuals, partnerships, or corporations for services provided in Canada." The CRA "considers the withholding to be a payment on account of the non-resident's potential tax liability in Canada," and the non-resident may apply for a treaty-based or income-and-expense waiver. — Canada Revenue Agency, Guide RC4445, T4A-NR — Payments to Non-Residents for Services Provided in Canada, https://www.canada.ca/en/revenue-agency/services/forms-publications/publications/rc4445/t4a-payments-non-residents-services-provided-canada.html

"The business profits of a resident of a Contracting State shall be taxable only in that State unless the resident carries on business in the other Contracting State through a permanent establishment situated therein." — Canada-United States Tax Convention, Article VII, https://www.canada.ca/en/department-finance/programs/tax-policy/tax-treaties/country/united-states-america-convention-consolidated-1980-1983-1984-1995-1997.html

Practitioner note

Regulation 105 is cash-flow theater for the treaty-protected and a genuine payer trap for the unprepared: the tax is usually zero, the 15% is usually recoverable, and the entire practice is timing — waivers filed weeks ahead for planned work, prompt remittance for surprises, and the recovery return the following spring. Our two standing artifacts are the payer's onboarding question and the provider's waiver calendar, because every painful file we've seen was missing one of them.

See also: For hiring a remote employee across the border, see hiring a remote employee across the border; and browse every cross-border tax topic guide, organized by situation.

Next step

Fairlight prepares the Regulation 105 program — waiver applications and renewals on treaty or income grounds, contract fee-allocation and day-log design, payer-side AP controls and remittance, and the recovery returns that bring the withholding home. See cross-border pricing or book a call.