A Canadian Company Hiring US Contractors: What You Withhold (Usually Nothing), What You File, and Where the Real Risks Sit

Cross-border contractor questions are usually asked in fear of a withholding regime that, for the standard case, isn't there. The standard case: a Canadian company engages a US-resident independent contractor — developer, designer, consultant, sales rep — who performs the work from the United States. Canadian side: Regulation 105's 15% withholding applies to fees for services rendered in Canada — services performed entirely outside Canada are outside it, so nothing is withheld, no T4A-NR is issued, and the payments are ordinary deductible expenses documented like any vendor invoice. US side: the payer is a foreign company with no US information-return obligation for paying its own vendor in the ordinary case (the 1099 regime binds US payers; a Canadian company without US operations isn't in it), and the US contractor simply reports their income and pays their own self-employment tax as they would with any client. The genuinely useful employer paperwork is preventive: a contractor agreement stating where services are performed and the independent relationship; an invoice trail; and — for the company's own file — the contractor's W-9 or W-8 status noted if the company has any US-payer characteristics (a US branch, US-source payments, or US payroll would change the reporting analysis, which is why the clean case is worth confirming rather than assuming). The three places risk actually concentrates: the border visit — the contractor who comes to Canada for the installation, the sprint, or the client meeting converts those days' fees into services rendered in Canada, triggering Regulation 105 withholding on the in-Canada portion (with the treaty-based waiver process available where the contractor has no Canadian PE — the waiver being the professional fix for planned engagements, and proration plus remittance the fix for discovered ones); the misclassification question — an American who works exclusively for the Canadian company, on its schedule, with its tools, is an employee in substance under whichever law applies, and the consequences run to US state employment law, workers' compensation, and payroll obligations the company avoided by label rather than fact (the employer-of-record industry exists precisely to make the employee answer easy — the batch on hiring employees across the border covers it); and the PE shadow — a US contractor who habitually concludes contracts in the company's name is the dependent-agent fact pattern that can hand the Canadian company a US permanent establishment, converting the company's own US tax answer, which is why sales-role contractor agreements get drafted with authority limits on purpose. GST/HST rounds out the file quietly: the US contractor's services are imported supplies — most commercial registrants self-assess nothing in practice because full input tax credits would offset, but the analysis belongs in the file for exempt-activity businesses where self-assessment has teeth.

Key takeaways

• Services performed outside Canada: no Regulation 105, no T4A-NR, no Canadian withholding. The invoice, the agreement, and proof of where the work happened are the file.
• No 1099 from the standard Canadian payer: the US information-return regime binds US payers; a Canadian company without US-payer characteristics files nothing American for its US vendors — the contractor's own 1040 and self-employment tax are their responsibility.
• In-Canada days flip the analysis: fees for the days worked in Canada attract 15% Regulation 105 withholding on account — plan visits with the treaty waiver (no-PE contractors routinely qualify), or prorate and remit; ignoring the visit is the version that surfaces in payer audits with penalties on the company.
• Misclassification is the expensive label: exclusivity, control, and integration make an employee whatever the contract says — and the exposure is US employment law and payroll, not Canadian tax; the employer-of-record route prices the honest answer.
• Sales contractors get authority limits: habitual contract-concluding authority in the US is the dependent-agent PE trigger — agreements for US sales roles state what the contractor cannot bind, and the company's US nexus review reads those agreements annually.
• Documentation set per contractor: agreement (place of performance, independence, authority limits), invoices, work-location attestations for the file, and a visit protocol everyone knows — the one-page policy that keeps the clean case provably clean.

The visit protocol

Because the in-Canada exception is the live risk, mature companies run a protocol: contractors notify before Canadian work; the engagement manager tags the days and fees; under the materiality the company sets, the Regulation 105 waiver is applied for in advance (the CRA's process wants lead time) or the withholding is taken and remitted with the T4A-NR issued after year-end; and the contractor is briefed that the withheld 15% is on account — recoverable through their Canadian filing if no tax is ultimately owed under the treaty. The protocol converts the messiest scenario into a form-and-calendar exercise, and its absence is why the same scenario appears in every payer-compliance review the CRA runs.

Worked example

A Toronto software company uses three US contractors. Contractor one, a Denver developer working entirely remotely at US$9,000 a month: no withholding, no T4A-NR, no 1099 — the agreement states Colorado performance, invoices flow, and the file is complete; her own accountant handles her Schedule C and self-employment tax. Contractor two, an Austin implementation specialist who spends two weeks at a Mississauga client's site: the visit protocol catches it — his no-Canadian-PE facts support a Regulation 105 waiver filed five weeks ahead; the waiver issues; the in-Canada fees pay gross with the waiver in the file; without it, the company would have withheld 15% of the US$14,000 visit fees and issued the T4A-NR, and he'd have filed a Canadian return to recover it. Contractor three, a Chicago sales rep on commission whose draft agreement let him "negotiate and close" Canadian-company deals across the Midwest: the nexus review rewrites it — proposals and negotiation yes, concluding contracts no, head office signs — keeping the dependent-agent analysis clean while changing nothing about how deals actually flow. Three contractors, no Canadian withholding remitted all year, and every dollar of that nothing documented — which is what the clean case looks like when it's built instead of assumed.

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

Hiring American contractors is the rare cross-border area where the default answer is 'nothing' — no withholding, no slips, no US returns for the payer — provided the work stays south and the file proves it. Our contractor program is three documents and one protocol: the agreement with place-of-performance and authority clauses, the invoice trail, the work-location file, and the visit process that turns Regulation 105 from an audit finding into a waiver application filed on time.

See also: Browse every cross-border tax topic guide, organized by situation · Short version: Employee or Contractor Across the Border: Two Countries' Tests, Two Withholding Regimes, and the Permanent Establishment Risk.

Next step

Fairlight prepares the contractor compliance program — agreement drafting with performance and authority clauses, the Regulation 105 visit protocol and waiver applications, misclassification and PE screening, and the payer documentation file. See cross-border pricing or book a call.