Cross-border staffing: the placement fee is easy, the payroll is the problem

Perm placements: the clean cross-border product

A one-time fee for recruiting a candidate into a US client's own payroll is the simplest cross-border revenue an agency can earn. The search happens from your Canadian office, the client hires the person directly, and your fee is business profits protected by the treaty — no US permanent establishment, no US federal tax. Keep a W-8BEN-E on file with every US client so accounts payable never withholds, and invoice knowing the fee is generally zero-rated for GST/HST when the client is a non-resident. USD fees book at the rate when earned, and guarantee-period refunds need matching FX treatment, not a plug.

Temp placements into the US: the employer of record decides everything

The moment a worker on your payroll performs the work at a US site, US payroll law follows them: an EIN, federal income tax withholding, state withholding, state unemployment insurance, and workers' compensation in that state — plus FICA instead of CPP unless a certificate of coverage under the Canada–US totalization agreement keeps the worker in the Canadian system for a temporary assignment. None of it is optional, and none of it is triggered by revenue; it is triggered by where the person stands when they work.

There is a structural warning underneath: a bench of your employees working inside the US, under contracts your agency signs, is exactly the fact pattern that strengthens an argument the agency itself carries on business there. Most agencies that scale US temp work end up with one of three answers — a US subsidiary that employs US-placed workers, a US employer-of-record in the middle, or a decision to sell only perm and contract placements south of the border. A Canadian corporation quietly running a W-2 workforce is the version that fails audits.

The worker's side: Article XV's two escape hatches

Employment income a Canadian resident earns for work performed in the US is exempt from US tax in two cases: the US earnings stay under US$10,000 for the year, or the worker is present in the US less than 183 days in any twelve-month period straddling the year and the pay is not borne by a US employer or US permanent establishment. The agency trap is that last leg — when your payroll cost is recharged to the US client, "borne by" gets argued. We treat the exemption as something to verify per placement, never assume.

Many placements ride on TN status — the USMCA list covers engineers, computer systems analysts, accountants, scientists, and other professions, and the status attaches to a specific employer. Immigration counsel handles the visa; we handle what follows it: residency ties, the certificate of coverage, dual filings in the first and last years, and the tax consequences when a placement converts to a direct US hire.

Classification at scale: one template, forty exposures

Contractor placements pay agencies well and concentrate risk. The tests run on both sides of the border — W-2 versus 1099 in the US, T4 versus T4A here — and they weigh control, tools, and integration, not the label in the agreement. An agency that misclassifies does not misclassify once; it misclassifies every placement built on the same template, and reassessments arrive with employer-side taxes, penalties, and interest for the whole lookback. One cross-border wrinkle worth knowing: a US client paying a Canadian contractor for work performed in Canada collects a W-8BEN and generally has no withholding or 1099 duty — paperwork your candidates will ask you to explain.

The domestic engine still has to hold all of this up: weekly temp payroll, T4s at volume, ROEs on every assignment end, and source-deduction remittances that scale with headcount. That machinery is its own discipline, and it is what our staffing agency payroll service runs.