Selling to American customers does not automatically mean a Canadian company owes U.S. taxes. But it does not mean the company is exempt, either. The answer depends on how the sales are made, where employees and assets are located, what type of income is involved, and whether the Canada-U.S. Tax Treaty provides protection.
Many Canadian companies begin selling into the U.S. market without evaluating their tax exposure. That works fine until the revenue reaches a threshold, an employee is hired in a U.S. state, or a state tax authority sends a nexus questionnaire. At that point, the company may discover it has been accumulating unfiled returns and unpaid tax obligations for years.
This article maps the specific triggers, obligations, and planning strategies Canadian companies need to understand when serving U.S. customers.
When U.S. Tax Obligations Are Triggered
The Permanent Establishment Test
The Canada-U.S. Tax Treaty is the primary framework governing whether a Canadian company's U.S. business profits are taxable in the United States. Under Article VII, business profits of a Canadian enterprise are taxable in the U.S. only if the enterprise carries on business through a permanent establishment in the U.S.
A permanent establishment includes a fixed place of business such as an office, branch, factory, or warehouse. It can also be created through a dependent agent who has and habitually exercises the authority to conclude contracts in the U.S. on behalf of the Canadian company.
Remote sales to U.S. customers from Canada, without employees, offices, or agents in the U.S., generally do not create a permanent establishment. This treaty protection is one of the most important tools for Canadian companies selling cross-border.
Economic Nexus for State Taxes
While the treaty may protect against federal income tax, state taxes operate independently. Following the 2018 South Dakota v. Wayfair Supreme Court decision, states can impose sales tax collection obligations on remote sellers that exceed economic nexus thresholds. The most common threshold is $100,000 in sales or 200 transactions in the state during the current or prior calendar year.
This means a Canadian e-commerce company selling $150,000 of product into Florida must register for, collect, and remit Florida sales tax, even though the company has no physical presence in the state and no federal income tax obligation.
Physical Presence Triggers
Beyond the permanent establishment analysis, physical presence in any form creates state-level tax exposure. Hiring a single employee in a U.S. state creates income tax nexus in that state. Storing inventory in a U.S. warehouse, including Amazon FBA fulfillment centers, creates nexus. Sending employees to the U.S. for extended periods to perform services can create both a treaty permanent establishment and state nexus.
Selling into the U.S. from Canada? TYM Consulting operates in both markets and can evaluate your exact tax exposure. Book a cross-border consultation.
Federal Income Tax Obligations
State Income Tax Obligations
States that impose a corporate income tax require foreign corporations with nexus to file state returns and pay tax on income apportioned to that state. Apportionment formulas vary by state but commonly use sales revenue as the primary factor.
Florida imposes a corporate income tax at 5.5% on income apportioned to the state. A Canadian company with significant Florida sales and a permanent establishment in the state would owe both federal and Florida corporate income tax.
U.S. Sales Tax for Canadian Companies
Canadian companies exceeding economic nexus thresholds in U.S. states must register for sales tax permits, collect sales tax on taxable transactions, and file periodic sales tax returns in each nexus state. The complexity scales with the number of states where thresholds are exceeded. A company selling nationwide may need registrations in 20 or more states.
Withholding Tax on U.S.-Source Income
Certain types of U.S.-source income paid to Canadian companies are subject to withholding tax, typically at 30% under the Internal Revenue Code. The treaty reduces these rates: dividends to 5% or 15%, interest to 10% (with exemptions for certain types), royalties to 10% (with exemptions for copyright royalties), and management fees to 0% in most cases.
Treaty Benefits and How to Claim Them
Treaty benefits are not automatic. The Canadian company must file Form 1120-F and attach Form 8833 (Treaty-Based Return Position Disclosure) to claim reduced rates or exemptions. Failure to disclose a treaty position can result in a $10,000 penalty per failure.
Common Scenarios for Canadian Companies
Compliance Costs and Planning Strategies
Cross-border tax compliance adds cost, but proactive planning reduces both the tax liability and the compliance burden. Strategies include structuring U.S. operations to avoid permanent establishment where possible, using commissionaire arrangements instead of dependent agents, timing employee travel to stay below treaty thresholds, centralizing U.S. sales tax compliance through automation tools, and maintaining contemporaneous documentation for transfer pricing.
TYM Consulting is a dual-market CPA firm with offices in Toronto and Miami. We help Canadian companies understand and manage their U.S. tax obligations. Schedule a cross-border tax review.