Subsidiary Corporations in Canada: What They Are, Why Businesses Use Them, and What the Law Requires

The modern business enterprise rarely operates through a single corporation. Most businesses of any scale, and many smaller ones, structure their operations across multiple related legal entities. At the centre of that structure is typically a parent corporation, which controls one or more subsidiaries, each of which is itself a separate corporation with its own legal identity, its own assets and liabilities, and its own directors and officers.

Understanding how subsidiary corporations work under Canadian corporate law, why businesses use them, what legal consequences flow from their use, and where their limitations lie is essential knowledge for any business operating through a corporate group. This post explains all of these matters with reference to the framework established by the Canada Business Corporations Act and the Ontario Business Corporations Act.

What a Subsidiary Is: The Legal Definition

Under both the CBCA and the OBCA, a body corporate is a subsidiary of another body corporate if it is controlled by that other body corporate, or if it is itself a subsidiary of a body corporate that is already a subsidiary of that other body corporate. The latter situation, sometimes called a chain of subsidiaries, means that the concept extends through multiple layers of ownership: a corporation can be the subsidiary of a subsidiary, and the ultimate parent at the top of the chain controls the entire group.

Control is defined by reference to voting shares. Under section 2(3) of the CBCA, a body corporate is controlled by a person or by two or more bodies corporate if securities of that body corporate to which are attached more than fifty per cent of the votes that may be cast to elect directors are held, other than by way of security only, by or for the benefit of that person or those bodies corporate, and the votes attached to those securities are sufficient, if exercised, to elect a majority of the directors.

In practical terms, a subsidiary is a corporation in which another corporation holds enough voting shares to control the election of the board of directors. The threshold is a majority of the votes that may be cast in a director election, which typically means more than 50 per cent of the voting shares.

When the parent holds every single share of the subsidiary, the subsidiary is called a wholly owned subsidiary. Wholly owned subsidiaries are the most common form in practice, particularly within established corporate groups. Where the parent holds a controlling but less than 100 per cent interest, the subsidiary has minority shareholders, which introduces its own set of governance and legal considerations.

A parent corporation that controls a subsidiary is called a holding body corporate in relation to that subsidiary. The two terms are the inverse of each other: the subsidiary is the entity that is controlled, and the holding corporation is the entity that controls it.

Affiliated Corporations

The related concept of affiliation is distinct from the parent-subsidiary relationship but arises directly from it. Under the CBCA, one body corporate is affiliated with another if one of them is the subsidiary of the other, or if both are subsidiaries of the same body corporate, or if each of them is controlled by the same person. Where two bodies corporate are affiliated with the same body corporate at the same time, they are deemed to be affiliated with each other. This means that two wholly owned subsidiaries of the same parent are affiliated with each other even though neither controls the other.

Affiliation has legal significance in a range of contexts under both statutes, including provisions governing share transactions between affiliated entities, various disclosure requirements, and the scope of certain statutory exemptions.

How a Subsidiary Is Created

A subsidiary relationship arises in several ways. The most common are as follows.

The parent corporation incorporates a new corporation from scratch, retaining ownership of a controlling block of its shares. This is the cleanest method because the new subsidiary begins its existence with no pre-existing liabilities or contractual entanglements, and the parent can design its share structure and governance documents to suit the purpose from the outset.

The parent corporation purchases a controlling block of shares in an existing corporation from that corporation’s shareholders. This acquisition method preserves the acquired corporation as a separate legal entity, which is often important where it holds regulatory licences, contractual rights, established goodwill, or existing customer relationships that would be difficult or impossible to transfer to a new entity. Where the acquisition creates a corporate group that meets the thresholds prescribed under the Competition Act, the transaction must be notified to and may be reviewed by the Competition Bureau of Canada.

The parent corporation amalgamates with another corporation that owns a controlling block of shares in what becomes the subsidiary, inheriting that ownership as a result of the amalgamation.

The parent corporation realizes on a security interest that causes it to take ownership of a controlling block of shares in the subsidiary.

The parent corporation acquires another corporation that itself owns a controlling block of shares in the subsidiary, creating a two-level corporate group through a single acquisition transaction.

Finally, a parent may create a subsidiary specifically to manage a distinct part of a diverse set of related operations, allowing the parent to focus its management attention on other strategies while the subsidiary operates the designated activity semi-independently.

Why Businesses Use Subsidiary Corporations

The use of subsidiary corporations as a form of business enterprise is a practice of long standing. As far back as 1953, legal scholars noted that the subsidiary corporation had been widely used across many areas of commercial endeavour for reasons including the desire for greater facility in financing, the management of taxation, and the elimination of cumbersome management structures. Those reasons remain relevant today, and the list of practical motivations for operating through subsidiaries has expanded considerably as business structures have grown more complex and global.

Liability Compartmentalization

Among the most significant reasons for establishing a subsidiary is the capacity to isolate liability. A parent corporation that conducts a risky line of business through a separate subsidiary corporation, rather than directly, limits its exposure to the liabilities arising from that activity to the amount it has invested in the subsidiary. Because the subsidiary is a separate legal entity, its creditors have claims against the subsidiary’s assets, not against the parent’s. This is sometimes described as compartmentalizing risk: each line of business is enclosed within its own corporate wrapper, and a catastrophic loss in one does not automatically imperil the others.

There is an important limitation on this benefit. When a subsidiary suffers a loss, that loss cannot readily be transferred back to the parent for tax purposes. The liability isolation that protects the parent’s assets from the subsidiary’s creditors also prevents the parent from flowing the subsidiary’s tax losses through to offset its own taxable income. The protection from external liability and the inability to utilize internal losses are two sides of the same coin.

Risk Reduction and Market Expansion

The subsidiary structure allows a parent to test a new product line, enter a new market, or pursue a business opportunity without committing the full resources and reputation of the parent entity. If the new venture fails, the parent contains the damage to the subsidiary. If it succeeds, the subsidiary can be grown into a substantial operation with its own brand identity, its own management team, and eventually its own ability to access capital. Expansion into new markets through subsidiaries also reduces the vulnerability of the overall enterprise to changes in demand for any single product line.

Brand and Goodwill Preservation

Where a parent corporation acquires an existing business through a share purchase, the acquired corporation’s brand, customer relationships, and goodwill are often significant parts of the value paid for. Maintaining the acquired corporation as a separate subsidiary with its own name and legal identity preserves the customer recognition and market confidence associated with that brand. Absorbing the acquired corporation into the parent through amalgamation can signal to customers and suppliers that further changes are forthcoming, which may erode the goodwill value that motivated the acquisition. Maintaining the separate existence of the acquired corporation may also be necessary to comply with the terms of its pre-existing contracts, to satisfy regulatory requirements applicable to its business, or to manage the tax implications that would arise from amalgamation.

Diversification of Operations

A diversified corporate group is one that conducts multiple unrelated businesses or produces unrelated products or services. Each distinct business in such a group may require unique management expertise, serve different customers with different expectations, and compete on terms that are specific to its own market. Operating each of those distinct businesses through a separate subsidiary allows the overall enterprise to allocate management and capital to each activity independently, to compete on the terms appropriate for that business’s market, and to measure the performance of each activity without the cross-contamination that results from running multiple activities within a single corporation.

Regulatory Requirements

In many regulated industries, certain activities may only be carried out by a corporation that meets specific regulatory requirements. A parent corporation that does not meet those requirements cannot engage in the regulated activity directly but may do so through a subsidiary that is appropriately constituted and licenced. Historically, for example, banks in Canada were required to carry on trust-related fiduciary business through separately licenced trust company subsidiaries. More recently, non-banks have in some cases acquired or created bank subsidiaries: Vancity Community Investment Bank, for example, operates as a wholly owned subsidiary of Vancity Credit Union. A subsidiary structure is often the only mechanism through which a diversified corporation can participate in a regulated industry.

International Operations

Operating in a foreign jurisdiction through a locally incorporated subsidiary typically produces better commercial and tax outcomes than conducting that business through the Canadian parent directly. A locally incorporated subsidiary may receive more favourable tax treatment under the laws of the foreign jurisdiction, may be eligible for government contracts that are not available to foreign entities, and may avoid the regulatory burden of foreign corporation registration requirements. For similar reasons, many businesses that operate in Canada do so as Canadian-based subsidiaries of foreign corporations. According to Statistics Canada’s most recent data, foreign-controlled multinational enterprises contributed 25 per cent of Canada’s corporate sector value added (gross domestic product at basic prices) in 2023.

The assumption that limited liability will apply to protect a Canadian parent from liabilities incurred by a foreign subsidiary is, however, not universally safe. The laws of the foreign jurisdiction govern liability in that jurisdiction, and some jurisdictions impose duties of care or other obligations on parent corporations with respect to their subsidiaries’ local activities that do not exist under Canadian law. Legal advice from counsel in the relevant foreign jurisdiction about the parent’s potential exposure before establishing a foreign subsidiary is essential.

Facilitating an Eventual Sale

Where a business plans to develop a new operation and then sell it once established, creating that operation as a subsidiary from the outset simplifies the eventual transaction significantly. Selling a subsidiary is accomplished by the parent selling the shares of the subsidiary to the purchaser, transferring the operating business, its contracts, its licences, and its assets to the new owner along with the subsidiary’s corporate identity. Selling a division that has been conducted directly within the parent requires a far more complex disaggregation of assets, contracts, and liabilities from the parent’s broader operations.

The Fundamental Principle: Separate Legal Personality

The legal foundation of the subsidiary structure is the doctrine of separate corporate personality: a corporation is a legal entity distinct from its shareholders. This principle was articulated in the House of Lords’ decision in Salomon v. Salomon & Co. and has been a cornerstone of Canadian corporate law ever since. Applied to the parent-subsidiary relationship, the doctrine means that despite their common ownership and often overlapping management, the parent and subsidiary are in principle independent corporations.

Section 45(1) of the CBCA and section 92(1) of the OBCA both state expressly that shareholders are not, as shareholders, liable for any liability, act, or default of the corporation. That rule applies with full force where the “shareholder” is a parent corporation: the parent’s share ownership does not make it responsible for the subsidiary’s debts, obligations, or defaults. Nor is a parent corporation liable for the torts of its subsidiary merely because it holds a controlling share interest.

It follows that the debts, liabilities, and assets of the subsidiary are those of the subsidiary alone, not of the parent. A parent corporation can, if the subsidiary is properly capitalized and maintained as a genuinely separate entity, limit its financial exposure to the subsidiary’s activities to the amount it has invested. It cannot, however, use the subsidiary structure to commit fraud, to effect arrangements that would otherwise be impermissible, or to render itself judgment-proof while continuing to benefit from the subsidiary’s operations.

Piercing the Corporate Veil: When Separate Personality Will Not Be Respected

The doctrine of separate corporate personality is not absolute. Courts will in exceptional circumstances disregard the separate legal identity of a subsidiary and hold the parent responsible for the subsidiary’s liabilities. This is known as piercing or lifting the corporate veil.

The circumstances in which Canadian courts pierce the corporate veil are genuinely exceptional. The threshold is high, and courts approach these cases with significant reluctance. Two conditions must generally both be satisfied. First, the parent must exercise complete domination and control over the subsidiary to the extent that the subsidiary has no independent functions of its own and exercises no discretion independently of the parent. The mere fact that the parent controls the subsidiary through its majority shareholding, which is always true by definition, is not enough. The required control is a degree of domination that eliminates the subsidiary’s independent corporate personality in practice. Second, the parent’s use of the subsidiary must amount to conduct akin to fraud or a sham that would otherwise unjustly deprive a claimant of their rights.

The British Columbia Court of Appeal stated the applicable principle in B.G. Preeco I (Pacific Coast) Ltd. v. Bon Street Holdings Ltd.: a judge may not lift the corporate veil merely because it seems unfair not to do so. The cases in which the corporate veil is pierced deal with circumstances where the corporation is used to effect a purpose or commit an act that the shareholder could not effect or commit directly. The Ontario Court of Appeal has similarly held that immunity from personal liability is a hallmark of the corporate structure and that courts will disregard the separate legal personality of a corporate entity only where it is completely dominated and controlled and being used as a shield for fraudulent or improper conduct.

The practical consequence for businesses operating through subsidiaries is that the subsidiary must be maintained as a genuinely independent operating entity. This means separate books and records, separate bank accounts, distinct management where possible, properly documented transactions with the parent conducted on arm’s length terms, adequate capitalization of the subsidiary to meet its obligations, and consistent maintenance of the subsidiary’s own corporate formalities. A subsidiary that is operated as a mere department of the parent, with no independent decision-making, no separate accounting, and no genuine corporate existence of its own, provides far weaker protection against veil-piercing than one that is run as a properly maintained separate legal entity.

Director Duties in the Subsidiary Context

One of the most significant governance complexities in a corporate group is the position of directors who serve simultaneously on the boards of the parent and one or more of its subsidiaries. This arrangement is extremely common in practice: when a corporation incorporates a subsidiary, it typically populates the subsidiary’s board with officers or directors of the parent. The legal consequences are often underappreciated.

The fiduciary duty of a director is owed to the corporation for which that director serves. A director of a subsidiary corporation owes their fiduciary duty to the subsidiary, not to the parent. This duty requires the director to act in the best interests of the subsidiary, even where those interests may conflict with the interests of the parent that nominated and can remove them. In Canada it has been held that nominee directors are required to act in the best interests of the corporation for which they serve, irrespective of the wishes of the appointing shareholder.

This creates an inherent tension. When a parent corporation directs its nominee director on the subsidiary’s board to approve a transaction that benefits the parent at the expense of the subsidiary, that nominee director cannot lawfully comply without breaching the duty owed to the subsidiary. The fact that the parent controls the subsidiary does not entitle the parent to direct the subsidiary’s directors to prioritize the parent’s interest over the subsidiary’s.

The duties of directors in the subsidiary context also extend to the subsidiary’s creditors when the subsidiary enters financial difficulty. Directors of a wholly owned subsidiary who would otherwise owe fiduciary duties only to the parent also owe fiduciary duties to the subsidiary’s creditors when the subsidiary enters the zone of insolvency. The directors of a wholly owned subsidiary cannot allow the subsidiary to be plundered for the parent’s benefit when the subsidiary is insolvent or approaching insolvency. Transactions that deplete the subsidiary’s asset base and render it unable to meet its obligations expose those directors to personal liability.

Where the parent corporation sends its officers or directors to serve on a subsidiary’s board, it implicitly accepts that those individuals must act in the subsidiary’s interests if the two conflict. Having taken the benefit of the subsidiary’s separate corporate existence, the parent cannot instruct its nominee directors to subordinate the subsidiary’s interests to its own.

Degree of Control: Majority Shareholding and Special Resolution Thresholds

Holding more than 50 per cent of the voting shares is sufficient to control the election of the subsidiary’s board and to govern its ordinary business. For most purposes, majority control is all the parent needs.

However, certain fundamental changes to a corporation require approval by special resolution, which under both statutes means a resolution passed by not less than two-thirds of the votes cast. A parent corporation that holds only slightly more than 50 per cent of the subsidiary’s voting shares cannot effect a fundamental change over the opposition of the minority shareholders. To amend the subsidiary’s articles, approve an amalgamation, or effect other matters requiring a special resolution unilaterally, the parent must hold at least two-thirds of the votes. This is a meaningful constraint where a partial acquisition has left the parent with less than a two-thirds interest.

Cumulative voting is an additional mechanism that affects board control. Under cumulative voting, each shareholder may cast a total number of votes equal to the number of directors to be elected multiplied by the number of shares held, and concentrate all of those votes on a single candidate. This allows a minority shareholder to secure board representation even without a majority of shares. A parent holding 60 per cent of the votes in a corporation with five directors to be elected and cumulative voting enabled may find that the minority can elect at least one board member.

The Prohibition on Circular Share Ownership

Both the CBCA and the OBCA contain a statutory prohibition that businesses operating within corporate groups must be aware of: a subsidiary corporation is generally prohibited from holding shares in its own holding corporation. Section 28 of the OBCA provides that a corporation shall not hold shares in itself or in its holding body corporate, and shall not permit any of its subsidiary bodies corporate to hold shares of the corporation. Where a subsidiary comes to hold shares in its parent, the corporation must cause that subsidiary to sell or otherwise dispose of those shares within five years of the date the holding relationship was established.

The purpose of this prohibition is to prevent circular ownership arrangements that could obscure the true ownership structure of the corporate group, manipulate voting outcomes, or undermine the integrity of the parent’s share capital. There are limited regulatory exceptions, including where the subsidiary holds shares as a trustee or legal representative without a beneficial interest, and through prescribed acquisition mechanisms applicable in the context of cross-border share exchange transactions.

Short-Form Amalgamation Within a Corporate Group

One practical advantage of the parent-subsidiary structure under both statutes is the availability of simplified amalgamation procedures that apply specifically within corporate groups.

Under section 177 of the OBCA and the corresponding CBCA provision, a holding corporation and one or more of its subsidiary corporations may amalgamate and continue as one corporation without following the full shareholder-approval process that a standard amalgamation requires. The amalgamation must be approved by resolutions of the directors of each amalgamating corporation, but no shareholder vote is required, no dissent rights arise, and the procedural requirements are considerably reduced. This vertical short-form amalgamation is used to absorb a subsidiary into the parent as a step in corporate restructuring.

Two or more wholly owned subsidiary corporations of the same holding body corporate may similarly amalgamate with each other by resolution of their directors alone. This horizontal short-form amalgamation simplifies the consolidation of sibling subsidiaries without shareholder involvement.

These short-form procedures are a significant practical tool for restructuring corporate groups. They allow businesses to consolidate subsidiary corporations, eliminate dormant entities, or simplify the corporate hierarchy without the expense and procedural complexity of a full amalgamation.

Financial Disclosure Obligations Within a Corporate Group

A parent corporation’s financial disclosure obligations extend to its subsidiaries. Under section 157 of the OBCA, true copies of the latest financial statements of each subsidiary of a holding corporation must be kept at the holding corporation’s registered office and must be open to examination by the holding corporation’s shareholders and their agents and legal representatives, who may make extracts free of charge on request during normal business hours.

The equivalent provision under section 157 of the CBCA requires a corporation to maintain copies of the financial statements of each of its subsidiary bodies corporate and of each body corporate whose accounts are consolidated in its own financial statements. Shareholders and their personal representatives have the right to examine those statements and to make extracts.

The purpose of this requirement is to ensure that shareholders’ access to financial information is not rendered meaningless by the subsidiary structure. Where a parent’s operations are substantially conducted through subsidiaries and the parent’s own financial statements are consolidated, the subsidiary-level statements provide the detail that allows shareholders to understand the financial position of each component of the group. The right of shareholders to examine this information at the parent’s registered office is a statutory protection that cannot be withheld.

Tax Considerations

Tax planning is one of the original and enduring motivations for using subsidiary corporations. The separate legal personality principle applies in the tax context: a corporation incorporated outside Canada is not resident in Canada merely because it is a subsidiary of a Canadian corporation, and a Canadian subsidiary’s tax residence is not affected by the residence of its foreign parent.

Foreign businesses that conduct regular business in Canada can do so through either a Canadian branch of the foreign corporation or a separately incorporated Canadian subsidiary. These alternatives have different tax consequences, including differences in how income is computed, how losses are applied, and what withholding taxes apply to payments between the foreign parent and its Canadian entity.

Within a Canadian corporate group, the general rule is that tax losses incurred by one subsidiary cannot be offset against taxable profits earned in another subsidiary or in the parent. Each corporation is a separate taxpayer, and losses remain locked within the entity that incurred them unless specific loss-transfer or consolidation provisions apply.

A foreign subsidiary located in another jurisdiction will generally be subject to the tax rules of that jurisdiction as a local taxpayer. This often produces more favourable local tax treatment than if the Canadian parent conducted the same activity directly in that jurisdiction. However, dividends paid from a foreign subsidiary to the Canadian parent may be subject to withholding tax, governed by the applicable tax treaty between Canada and the foreign jurisdiction, and the Canadian parent may be required to include foreign affiliate income in its own taxable income under applicable Canadian tax rules.