Filing Corporate Taxes in Multiple Provinces in Canada
A Canadian corporation may serve customers throughout the country without becoming subject to corporate income tax in every province. Its filing obligations depend primarily on where it has a permanent establishment and how its taxable income must be allocated among those jurisdictions.
Understanding this distinction is essential when filing corporate taxes in multiple provinces in Canada. A customer’s address alone does not generally determine the province in which corporate income is taxable. For the broader filing context, see our complete guide to corporate tax returns in Canada.
When is a corporation taxable in multiple provinces?
A corporation must generally allocate its taxable income among provinces when it carries on business through permanent establishments in more than one jurisdiction.
A permanent establishment may include:
- an office or branch;
- a factory, workshop, or warehouse;
- a mine, oil well, or farm;
- another fixed place of business;
- in certain circumstances, an employee or agent with general authority to enter into contracts for the corporation.
If a corporation has no fixed place of business, its principal place of business may be treated as its permanent establishment. Where it has no other establishment, the head office or registered office identified in its incorporation documents may also become relevant.
The determination is fact-specific. Remote employees, sales teams, inventory, or premises regularly used in another province may require closer analysis. The CRA notes that a location is not a permanent establishment unless a business is connected with it. Review the CRA’s permanent-establishment guidance.
Are sales to customers in another province enough?
Not necessarily.
A Quebec corporation selling products or services to Ontario customers does not automatically become subject to Ontario corporate income tax. Similarly, operating a website accessible throughout Canada does not, by itself, create a permanent establishment in every province.
The conclusion may be different if the corporation has any of the following in another province:
- an office or warehouse;
- employees performing significant business functions;
- a representative authorized to enter into contracts;
- equipment, inventory, or permanent facilities;
- a sufficiently stable operational presence.
Extra-provincial registration, sales tax, payroll, and corporate income tax obligations are separate. A corporation may therefore have to register or collect sales tax in a province without necessarily having taxable income allocated there.
How does T2 provincial allocation work?
When a corporation has permanent establishments in more than one province or territory, it must enter “multiple” on line 750 of its T2 return and complete Schedule 5, Tax Calculation Supplementary – Corporations.
Part 1 of Schedule 5 reports the T2 provincial allocation of taxable income. It is required even when the corporation has no taxable income for the year. The CRA explains when Schedule 5 must be completed.
For most businesses, the taxable income allocated to a province is based equally on:
- the proportion of gross revenue attributable to the permanent establishment in that province; and
- the proportion of salaries and wages attributable to employees of that establishment.
The general formula can be summarized as follows:
Provincial allocation percentage = (provincial gross revenue percentage + provincial salaries and wages percentage) ÷ 2.
If the corporation has no salaries and wages, allocation is generally based on gross revenue. If gross revenue is nil, the allocation is normally based on salaries and wages. Special rules apply to certain industries and arrangements, including financial institutions, insurance companies, transportation businesses, and corporate partners in partnerships.
Example of a two-province allocation
Assume a corporation has permanent establishments in Quebec and Ontario:
| Allocation factor | Quebec | Ontario |
|---|---|---|
| Gross revenue | 60% | 40% |
| Salaries and wages | 70% | 30% |
| Average allocation percentage | 65% | 35% |
If the corporation has total taxable income of $200,000, the general allocation would be:
- Quebec: $130,000;
- Ontario: $70,000.
The applicable provincial rates and credits would then be applied to the portion allocated to each province.
This example is simplified. The rules for attributing revenue and salaries can produce a different result depending on the corporation’s activities. The CRA provides detailed guidance in Income Tax Folio S4-F3-C2, Provincial Income Allocation.
How many corporate tax returns are required?
The answer depends on the provinces in which the corporation has permanent establishments.
Provinces and territories administered by the CRA
The CRA administers provincial corporate income tax for every province and territory except Quebec and Alberta.
For example, a corporation operating in Ontario and British Columbia will generally calculate its federal and provincial taxes within one T2 return, together with Schedule 5 and any applicable provincial schedules.
This does not mean that one provincial tax rate applies to all its income. Schedule 5 allocates the taxable income so that each portion is subject to the rules of the appropriate jurisdiction. The CRA summarizes the provincial and territorial corporate tax system here.
Permanent establishment in Quebec
A corporation with an establishment in Quebec will generally file:
- a federal T2 return with the CRA; and
- a Quebec CO-17 corporate income tax return with Revenu Québec.
This can apply even if the business was incorporated federally or in another province. Revenu Québec states that a CO-17 is required where a corporation had an establishment in Quebec at any time during the taxation year. Review the CO-17 filing information.
Permanent establishment in Alberta
A corporation with a permanent establishment in Alberta will generally file:
- a federal T2 return with the CRA; and
- an Alberta AT1 corporate income tax return with Alberta Tax and Revenue Administration.
Subject to limited exceptions, Alberta requires an AT1 when a corporation had a permanent establishment in the province at any time during the taxation year. Review Alberta’s corporate income tax requirements.
A corporation with permanent establishments in Quebec, Alberta, and Ontario could therefore have to file a T2, a CO-17, and an AT1, together with the appropriate allocation schedules.
Filing deadlines and tax payments
A T2 return is generally due within six months after the corporation’s tax year-end. Quebec CO-17 and Alberta AT1 returns are also generally subject to a six-month filing deadline. Missing a filing deadline may result in late corporate tax filing penalties.
Corporate tax balances are normally payable before the filing deadline. The precise balance-due date may depend on the corporation’s status, its eligibility for the small business deduction, and the tax authority involved.
A corporation operating in multiple jurisdictions may also have to make separate corporate tax instalments to:
- the CRA;
- Revenu Québec, if it has an establishment in Quebec;
- Alberta Tax and Revenue Administration, if it has a permanent establishment in Alberta.
The corporation should therefore determine each authority’s instalment requirements before the returns become due.
Records needed to support the allocation
A defensible allocation requires more than an annual sales total. The corporation should be able to identify:
- where each service was performed;
- the destination of merchandise sold;
- the establishment responsible for contracts and sales;
- the province to which each employee is attached;
- salaries and wages paid by establishment;
- offices, warehouses, and other business premises;
- the activities of remote employees;
- operational changes made during the year.
For a service business, gross revenue may depend on where the services were physically performed. If services are performed in a province where the corporation has no permanent establishment, special rules may attribute that revenue to the establishment to which the person who negotiated the contract is reasonably attached.
Trying to reconstruct this information after year-end increases the risk of error, particularly when payroll, invoicing, and operating records are not coded by province.
Common mistakes to avoid
Allocating income based only on the billing address
The customer’s address is not always the correct factor. The nature of the transaction, location of the services, destination of merchandise, and responsible establishment may all be relevant.
Assuming the province of incorporation controls taxation
The corporation’s jurisdiction of incorporation is not necessarily the only province entitled to tax it. Its operations and permanent establishments are generally more important.
Overlooking an employee working from another province
Remote work may affect the analysis, particularly if the employee uses a stable location or has significant authority. The conclusion depends on the specific facts.
Filing only the T2 when there is a Quebec or Alberta establishment
Schedule 5 does not replace the CO-17 or AT1. Quebec and Alberta administer their own corporate income taxes.
Confusing income tax allocation with sales tax obligations
Corporate income allocation does not automatically determine GST/HST, QST, or provincial sales tax obligations. Those requirements must be reviewed separately.
Why provincial allocation matters
An incorrect allocation can result in:
- insufficient tax paid to one province;
- excess tax paid to another;
- interest and penalties;
- information requests or reassessments;
- amendments to several returns;
- missed or incorrectly calculated provincial credits.
The allocation may also affect provincial small business deductions and other jurisdiction-specific incentives. It is therefore more than a reporting formality.
Frequently asked questions
Must I file in every province where I have customers?
Generally, no. Customers or sales in a province do not automatically create a permanent establishment. The corporation’s actual operating presence must be considered.
Can a federally incorporated corporation be required to file a CO-17?
Yes. A federal corporation with an establishment in Quebec may have to file a CO-17 in addition to its T2 return.
Must an Ontario corporation with an Alberta office file an AT1?
Generally, yes, if the office constitutes a permanent establishment in Alberta. The corporation must also report its provincial allocation on the T2 return.
Does Schedule 5 allocate sales or accounting profit?
Schedule 5 allocates the corporation’s taxable income. Gross revenue and salaries are generally used as allocation factors; they are not themselves the amount of tax.
Does a home-based employee automatically create a permanent establishment?
No. Relevant considerations may include the corporation’s control over the location, its permanence, the employee’s responsibilities, and any authority to enter into contracts. A professional review is advisable because small factual differences can change the conclusion.
Get help with corporate tax in multiple jurisdictions
Corporate tax in multiple jurisdictions in Canada requires coordinated reporting of permanent establishments, gross revenue, payroll, and provincial filing obligations.
T2Online.ca, the specialized corporate year-end service of DFD-CPA, can assist with the T2 return, Schedule 5, and the corresponding provincial returns when required. Reviewing the corporation’s operating structure before year-end can also help establish the correct instalments and reduce reassessment risk.
This article provides general information. Permanent-establishment and provincial-allocation conclusions depend on the corporation’s particular facts.
