ASPE 1591 Explained: Subsidiaries and Control for Canadian Private Companies (2026)

Reviewed by Bader A. Chowdry, CPA, CA, LPA on September 2, 2026.

What does “subsidiary” actually mean under ASPE 1591?

ASPE Section 1591, Subsidiaries, sets the standard Canadian private enterprises use to decide when another entity — usually another corporation, but potentially a trust or other legal structure — is a “subsidiary” for financial-reporting purposes, and how to account for it once that determination is made. The section applies to enterprises reporting under Accounting Standards for Private Enterprises; publicly accountable enterprises use IFRS 10 instead, which has a related but different control model.

Under Section 1591, one enterprise is a subsidiary of another when the other enterprise controls it — a test that goes beyond simple share ownership. Control is generally the continuing power to determine the subsidiary’s strategic operating, investing, and financing policies without the cooperation of others.

When does control exist without majority ownership?

This is where ASPE 1591 catches many small and mid-size Canadian corporate groups off guard. Control can exist even where an enterprise does not hold a majority of the voting shares, if it has the continuing ability to elect the majority of the subsidiary’s board of directors through rights, options, warrants, convertible debt, convertible non-voting equity (such as preferred shares), or similar instruments that, if exercised or converted, would give it majority voting control. This is sometimes called control through “potential voting interests.”

Common Canadian holdco structures where this comes up: a parent holding 40–49% of common shares plus a shareholder agreement or convertible preferred structure that would tip it over 50% if exercised; a corporation with special voting shares held by a related party who acts, in substance, at the parent’s direction; or a structure with a unanimous shareholder agreement that concentrates practical decision-making with one party despite a more even nominal share split. In each case, the accounting answer can differ from what the share register alone would suggest — which is exactly why this determination benefits from a CPA’s review rather than an assumption carried over from last year.

Consolidate, or use the cost or equity method — how do you choose?

Once control is established, ASPE gives private enterprises a genuine accounting policy choice that IFRS reporters don’t get: consolidate the subsidiary into the group’s financial statements, or account for the investment using the cost method or the equity method instead of consolidating.

This is a real, consequential choice, not a formality. Consolidating combines 100% of the subsidiary’s assets, liabilities, revenue, and expenses into the parent’s statements (with a non-controlling-interest line if less than 100% owned), which changes reported balance-sheet size, leverage ratios, and — for many privately held groups — how the statements look to a bank or other reader relying on them. Using the cost or equity method instead keeps the subsidiary’s results largely out of the consolidated numbers, showing only the parent’s investment and its share of earnings or dividends, which produces a simpler, often more compact set of statements.

The choice is an accounting policy election, and once made for enterprises of a similar nature, it must be applied consistently — a private company generally cannot consolidate one subsidiary and use the cost method for another subsidiary of a similar type in the same group, without a defensible reason for the distinction. This consistency requirement is one of the more commonly overlooked pieces of Section 1591.

What’s the difference between the cost method and the equity method?

Both are alternatives to consolidation, but they produce different numbers. Under the cost method, the investment is carried at cost, and income is recognized only when a dividend is declared — the parent’s income statement doesn’t move with the subsidiary’s underlying profitability, only with cash actually distributed. Under the equity method, the parent’s investment is adjusted each period for its proportionate share of the subsidiary’s net income or loss, whether or not that income is actually distributed — so the parent’s statements track the subsidiary’s economic performance more closely, even without a dividend.

One restriction applies regardless of preference: if the subsidiary’s equity securities are quoted in an active market, the cost method is not permitted — the enterprise must consolidate, use the equity method, or measure the investment at its quoted market amount with changes recognized in net income.

Does ASPE’s definition of control match the CRA’s definition?

No — and this is a distinction that catches even experienced business owners off guard. ASPE 1591’s “control” test, used to decide accounting treatment, is a different concept from the Income Tax Act‘s “control” test under subsection 256, used to decide whether two or more corporations are associated for tax purposes — which affects, among other things, how the small business deduction limit is shared across a corporate group. The Income Tax Act recognizes both de jure (legal) control and, in some circumstances, de facto (factual) control, and the specific facts that create control for CRA purposes do not always line up with the facts that create control for ASPE purposes.

In practice, this means a group of corporations can be “associated” for tax purposes — sharing a single small business deduction limit — without one entity being a “subsidiary” of another for accounting purposes, or vice versa. Groups with cross-ownership, family shareholdings, or holdco structures should have both questions reviewed separately: the accounting consolidation decision under ASPE 1591, and the associated-corporations determination under Income Tax Act subsection 256, reported annually where applicable on Schedule 9 of the T2 return.

What does a Canadian holdco with subsidiaries need to disclose?

Whichever method is chosen, ASPE requires disclosure sufficient for a reader to understand the accounting policy applied and the nature of the group’s subsidiaries — including, where relevant, why a subsidiary was or was not consolidated, and information about any subsidiaries excluded from consolidation. For groups that do consolidate, the notes typically describe the basis of consolidation and identify any non-controlling interests. For groups using the cost or equity method, the notes should be clear enough that a lender or other reader understands what is — and is not — reflected in the numbers they’re relying on. CPA Ontario’s financial reporting guidance is a useful reference point for staying current on how these disclosures are applied in practice.

When would a private company need to switch to IFRS instead?

ASPE is available to private enterprises; it is not available to publicly accountable enterprises (broadly, entities with securities traded in a public market, or that hold assets in a fiduciary capacity for a broad group of outsiders, such as many financial institutions). A private holdco group that pursues a public listing, brings in certain types of institutional capital, or otherwise becomes publicly accountable will generally need to transition from ASPE to IFRS — which uses IFRS 10’s control model instead of Section 1591, and does not offer the ASPE cost/equity policy choice; IFRS generally requires consolidation of controlled subsidiaries. This is a significant transition to plan for well in advance, not something to discover at the point of a financing event.

Frequently asked questions

Is consolidation mandatory for Canadian private companies with subsidiaries?

No. ASPE 1591 gives private enterprises a policy choice between consolidating a controlled subsidiary or using the cost or equity method instead — this flexibility does not exist under IFRS, which generally requires consolidation of controlled entities.

Can a company use different methods for different subsidiaries?

Generally, the chosen method must be applied consistently to subsidiaries of a similar nature. Using different methods for materially similar subsidiaries without a defensible basis is a compliance risk your CPA should review.

Does ASPE 1591 apply to joint ventures?

No — joint ventures and jointly controlled entities are addressed under a separate ASPE section (Section 3056, Interests in Joint Arrangements), not Section 1591, because joint control is a distinct concept from the unilateral control that defines a subsidiary.

What happens if my holdco owns 40% of a company but effectively controls it?

Ownership percentage alone doesn’t determine the accounting answer. If your holdco has the continuing ability to elect the majority of the board — through convertible instruments, shareholder agreements, or similar rights — the investee can still be a subsidiary under ASPE 1591 despite the minority ownership stake. This determination should be documented and reviewed with your CPA.

Do I need audited consolidated statements if I choose to consolidate?

The level of assurance — audit, review, or compilation — on consolidated statements is a separate question from the consolidation policy itself, and is typically driven by lender, shareholder, or regulatory requirements rather than by ASPE 1591. See our related guide on when a business needs audited versus reviewed financial statements for how that determination is typically made.