Canadian Employer With U.S. Employees: Payroll Registration, the Remote Worker in Florida, and the Totalization Certificate

A Canadian employer's first U.S. employee is a payroll project on both sides of the border, and the answer depends on who the employee is. The U.S. remote employee: a U.S. resident hired by a Canadian company to work from their home in Florida is employed in the United States — their wages are U.S.-source income for services performed in the United States, taxable in the United States and not in Canada (the employee isn't a Canadian resident, and the work isn't performed in Canada — the Canadian payroll deductions don't apply — no income tax withholding for an employee neither employed nor resident in Canada (Income Tax Regulations 104(2)), no CPP because the employee neither reports for work at a Canadian establishment nor is a Canadian resident (and the Totalization Agreement puts locally hired U.S. workers under U.S. Social Security), and no EI for an employee who doesn't ordinarily reside in Canada); the Canadian employer must operate a U.S. payroll: obtain an EIN (Form SS-4 — the international applicant process), withhold federal income tax (from the employee's Form W-4), withhold and pay Social Security and Medicare (FICA — the employer's 7.65 percent and the employee's), pay the federal unemployment tax (Form 940), file Forms 941 quarterly and W-2s annually, make the deposits on the schedule (the payroll tax deposit guide), and register with the employee's state — Florida's reemployment tax (the Florida reemployment tax guide — no state income tax withholding in Florida, which simplifies it; an employee in a state with an income tax requires that state's withholding registration). The permanent establishment question: a Canadian company with an employee working in the United States may have a U.S. permanent establishment — if the employee habitually concludes contracts in the company's name (a dependent agent), or if the employee's home office is at the company's disposal as a fixed place of business (the treaty's Article V fixed-place rule, read with the OECD Commentary — persuasive but not binding on the Canada–U.S. treaty — whose 2025 update generally treats a home office as the company's place of business only if the employee works there at least half their working time over a twelve-month period and there is a commercial reason, such as serving local customers, for the work being done in that country) — and a permanent establishment makes the company's U.S. business profits attributable to it taxable in the United States (Form 1120-F and the branch profits tax — the Canadian company expanding to Florida guide); a sales employee closing deals from a Florida home office is the highest-risk profile; a software developer working remotely on internal projects the lowest; the Canadian company that hires its second or third U.S. employee often forms a U.S. subsidiary to employ them (the subsidiary as the employer — the permanent establishment of the Canadian parent avoided, the subsidiary paid a cost-plus service fee by the parent under a transfer pricing policy — the expanding guide). Benefits: U.S. employees expect U.S. benefits — health insurance (the Canadian company's provincial health plan doesn't cover them; a U.S. group plan or a health reimbursement arrangement), a 401(k) (a Canadian company can sponsor one for its U.S. employees — or through a professional employer organization), and state-mandated leave (Florida has no state paid-leave mandate, and s. 218.077 bars Florida counties and cities from requiring private employers to provide sick leave, vacation, or other benefits; other states do). The employer of record — the stopgap: a professional employer organization or employer-of-record service becomes the employee's W-2 employer (the staffing agency taxes guide's PEO), running the U.S. payroll, benefits, and state registrations, and invoicing the Canadian company — the fastest way to hire the first U.S. employee without a U.S. entity or payroll registration; the permanent establishment analysis still applies to the work the employee does for the Canadian company (the EOR is the employer on paper, but the treaty's dependent-agent test asks whether the person habitually exercises authority to conclude contracts in the Canadian company's name, not who issues the W-2). The Canadian employee sent to the United States: a Canadian resident employee sent to work in Florida for a period (a secondment to open the office — the expanding guide's sales director) is a different case: the immigration status first (a TN for a Canadian citizen in one of the professions listed in the USMCA, an L-1 for a manager, executive, or specialized-knowledge employee who has worked for the company abroad for at least one continuous year in the past three, an E-2 for a Canadian national in an executive, supervisory, or essential role at a U.S. enterprise at least 50 percent Canadian-owned — no work may be performed in the United States without one; a business visitor's permitted activities are narrow); U.S. income tax on the wages for the days worked in the United States (U.S.-source) unless the treaty's employment article exempts them (the employee present in the United States not more than 183 days in any twelve-month period and paid by an employer that is not a U.S. resident and the remuneration not borne by a U.S. permanent establishment — or wages of US$10,000 or less for the year — the treaty guide), with the employer's U.S. withholding obligation for the non-exempt wages (the employee files Form W-4 for taxable wages, or Form 8233 to claim the treaty exemption from withholding on wages the treaty exempts); Canadian income tax continuing on worldwide income (the employee is still a Canadian resident, with a foreign tax credit for the U.S. tax — and the employee can request a CRA letter of authority, on Form T1213, reducing the Canadian source deductions for the foreign tax credit); social security under the Canada–U.S. Totalization Agreement — a Canadian employee sent to the United States for an expected period of five years or less stays in the Canada Pension Plan (and out of U.S. FICA) with a certificate of coverage from the CRA (Form CPT56, under Article V of the agreement, for up to 60 months), so the employer continues CPP contributions in Canada and pays no U.S. Social Security or Medicare tax on the employee's U.S. wages — the agreement doesn't cover unemployment insurance, so FUTA and Florida reemployment tax still apply to U.S. work, and EI generally stops because that work is insurable under U.S. law; without the certificate, both countries' social security apply. The Canadian side for the Canadian employer: the employer's own Canadian payroll continues for its Canadian employees; the U.S. employees' wages are deductible to the Canadian company (or recharged to the U.S. subsidiary); the Canadian company reports its U.S. payroll activity in its own books and, if it has a U.S. branch or subsidiary, on the related filings (T106 for transactions with a non-arm's-length non-resident — the expanding guide). The bookkeeping: the U.S. payroll (EIN, W-4s, deposits, 941s, 940, W-2s, Florida reemployment); the permanent establishment analysis by employee role; the EOR invoices if used; the secondees' immigration documents, day counts, treaty positions, and coverage certificates; benefits by country. The errors: the Canadian company paying a Florida remote employee through its Canadian payroll with Canadian deductions (wrong country — no U.S. withholding or FICA, no W-2, no Florida registration); a sales employee in Florida closing contracts without a permanent establishment review; a secondee working in Florida on a visitor's entry; the coverage certificate never obtained (double social security); and the treaty's 183-day exemption assumed for a secondee whose wages are recharged to a U.S. subsidiary (borne by a U.S. employer — no exemption).

Key takeaways

• A U.S. resident working from Florida for a Canadian company is a U.S. employee — EIN, federal withholding, FICA, FUTA, Forms 941 and W-2, and Florida reemployment tax; no Canadian source deductions.
• The employee's role can create a U.S. permanent establishment — a salesperson concluding contracts or a home office the company treats as its place of business; most Canadian companies form a U.S. subsidiary by the second or third U.S. hire.
• An employer of record is the fastest first hire — the W-2 employer on paper — but the permanent establishment analysis still looks at the work.
• A Canadian employee sent to the United States needs an immigration status first, then U.S. tax on U.S. workdays unless the treaty's 183-day or US$10,000 rule exempts them — and no exemption if the wages are borne by a U.S. entity.
• The Totalization Agreement's certificate of coverage keeps a secondee (five years or less) in the Canada Pension Plan and out of U.S. FICA.
• U.S. employees expect U.S. benefits — health coverage and a 401(k) — which a Canadian company can sponsor directly or through a PEO.

The Canadian employer's U.S. payroll file

U.S. residents: EIN; W-4s; federal deposits; Forms 941, 940, W-2; Florida reemployment (or the employee's state's registrations). Permanent establishment review by role; subsidiary decision. EOR contract if used. Secondees: immigration status; day counts; treaty position; U.S. withholding where required; certificate of coverage; Canadian source deduction adjustments. Benefits by country. The permanent establishment review is the decision that comes before the second hire.

Worked example

A Montreal video game studio hires a senior developer who lives in Tampa: for the first year, through an employer-of-record service (the EOR runs U.S. payroll, federal withholding, FICA, Florida reemployment tax, and a health plan and 401(k), invoicing the studio monthly) — the developer works on internal game projects from home and concludes no contracts, so the studio's advisers conclude there's no permanent establishment. When the studio hires two more — a U.S. business development manager in Miami who will negotiate and sign publishing deals and a producer — it forms a Delaware subsidiary to employ all three (the business development role would otherwise be a dependent agent of the Canadian parent), registers the subsidiary in Florida, and the parent pays the subsidiary a cost-plus service fee for their work under a documented transfer pricing policy. Its Quebec lead designer, sent to the Miami office for nine months on an L-1 visa to train the team, stays on the studio's Canadian payroll with a certificate of coverage keeping her in the Quebec Pension Plan (Quebec's equivalent — under the separate Québec–United States social security agreement, with the certificate issued by Retraite Québec on form Q-111-3 rather than by the CRA); because her salary is recharged to the U.S. subsidiary, the treaty's 183-day exemption doesn't apply — the subsidiary withholds U.S. income tax on her U.S. workdays, and she claims the foreign tax credit in Canada. A competitor paid a Florida employee through its Canadian payroll with Canadian deductions for two years — no W-2s, no FICA, no Florida registration — and spent a year unwinding it.

Official sources

Publication 597 explains: “This publication provides information on the income tax treaty between the United States and Canada. It discusses a number of treaty provisions that most often apply to U.S. citizens or residents who may be liable for Canadian tax.” — Internal Revenue Service, Publication 597 (10/2015), Information on the United States–Canada Income Tax Treaty, https://www.irs.gov/publications/p597

The Florida Department of Revenue states: “The initial tax rate for new employers is .0270 (2.7%), which is applied to the first $7,000 in wages paid to each employee during a calendar year. Any amount over $7,000 for the year is excess wages and is not subject to tax.” — Florida Department of Revenue, Florida Reemployment Tax, https://floridarevenue.com/taxes/taxesfees/Pages/reemployment.aspx

Practitioner note

A Canadian company's first U.S. employee is a payroll project in the right country — U.S. withholding, FICA, W-2s, and Florida reemployment tax, not Canadian source deductions — and a permanent establishment question that turns on what the employee does: the developer on internal projects rarely creates one, the salesperson signing deals from a Florida home office usually does. Our desks run the first hire through an employer of record when speed matters, form the U.S. subsidiary before the role that creates the permanent establishment, and handle the Canadian secondee's visa, treaty position, and certificate of coverage together — because the 183-day exemption disappears the moment the salary is recharged to a U.S. entity.

See also: For related guidance, see cross-border payroll obligations for Canada–U.S. employers; and browse every cross-border tax topic guide, organized by situation.

Next step

Fairlight Accounting is a cross-border accounting and tax practice with a U.S. Tax Desk and a Canadian Tax Desk. Our U.S. Tax Desk and Canadian Tax Desk handle Canadian employers with U.S. employees — U.S. payroll registration and compliance, Florida reemployment tax, permanent establishment analysis by employee role, employer-of-record arrangements, U.S. subsidiary employment structures, secondee treaty positions and withholding, Totalization Agreement certificates of coverage, and cross-border benefits. See pricing or book a call.