Associated Corporations Rule
Associated corporations under ITA s.256 must share a single $500,000 Small Business Deduction limit and combine their passive income and taxable capital for the SBD grind tests.
Federal · Updated September 23, 2026
Definition
Two corporations are associated under ITA s.256(1) when control or significant share ownership is common to both, either directly through a controlling shareholder, through a related group, under the detailed control, relationship and ownership tests. A common 25% shareholder alone is not a universal association test. The associated-corporations rule prevents taxpayers from multiplying the Small Business Deduction by splitting a business into multiple corporations.
Key rules
- Five associated tests (ITA s.256(1)):
- One corporation controls the other.
- Both are controlled by the same person or group of persons.
- Each is controlled by a person, and the two controllers are related and one owns at least 25% of a class other than a specified class in each corporation.
- One corporation is controlled by a person who is related to each member of a group that controls the other, and that person owns at least 25% of a class other than a specified class in the other corporation.
- Each is controlled by a related group, every member of one group is related to every member of the other, and one or more people belonging to both groups own, alone or together, at least 25% of a non-specified class in each corporation.
- Related persons: spouses, common-law partners, parents, children, siblings, and corporations controlled by them (ITA s.251).
- Deeming rules: subsection 256(1.4) can deem ownership/control through options and similar rights. Subsection 256(1.3) can attribute a minor child’s shares to a parent, subject to its business-management exception.
- Anti-avoidance (ITA s.256(2.1)): if one of the main reasons for the separate existence of two or more corporations is to reduce tax, they are deemed associated.
- Election not to be associated through a third corporation (ITA s.256(2)): a third corporation associated with two others that are not associated with each other can break the chain if the third corporation files a s.256(2) election, in which case only the third loses its SBD.
Consequences of association
| Item | Effect |
|---|---|
| Small Business Deduction limit | Share one $500,000 limit (ITA s.125(3)) via T2 Schedule 23 |
| Taxable capital | Combined across the group for the $10M–$50M grind |
| Passive income (AAII) | Combined across the group for the $50K–$150K grind |
| Refundable Part I tax | Separate per corporation, but RDTOH rules apply per entity |
| Other tax attributes | Apply each provision’s own rules; association does not create a general shared vehicle-cost ceiling |
Example
Jin owns 100% of Alpha Co and 50% of Beta Co. Jin's spouse, Mia, owns the other 50% of Beta Co.
- Common controlling group: Jin and Mia together control both corporations, because Jin owns all of Alpha and the couple owns all of Beta. Separately, Jin controls Alpha Co; Jin and Mia together control Beta Co; Jin and Mia are related; Jin owns at least 25% of a class of shares of both. Alpha and Beta are associated.
- SBD sharing: the $500,000 business limit must be allocated between Alpha and Beta on T2 Schedule 23. If Alpha claims $300,000 and Beta claims $200,000, each corporation applies the 9% federal SBD rate only up to its allocation.
- Passive income: AAII from both corporations is added. If Alpha earned $30,000 and Beta earned $40,000 of AAII, combined AAII is $70,000, reducing the group's business limit by ($70,000 − $50,000) × 5 = $100,000 for the following year.
Common-law partnerships count as related under s.251. Apply the tax definition of common-law partner and the actual control/ownership tests; cohabitation or relatedness alone does not automatically associate two corporations.
Common mistakes
- Forgetting children's shares. Subsection 256(1.3) contains a minor-share attribution rule and a business-management exception.
- Missing option-based deeming. A shareholder agreement granting a call option is treated as exercised for association purposes.
- Treating sister corporations as independent because no single person controls both. The related-group test catches siblings and spouses.
- Ignoring the s.256(2.1) anti-avoidance rule when using a holdco-opco-sisterco structure primarily to multiply the SBD.
- Allocating the business limit informally. The allocation must be filed on Schedule 23 and agreed by each associated corporation.
See CRA’s six association conditions and examples before applying the shorthand tests to a share structure.
Related concepts
Sources
- Income Tax Act s.256
- Income Tax Act s.256(1)
- Income Tax Act s.256(1.2)
- Income Tax Act s.256(2)
- Income Tax Act s.125(3)
Keep the books behind these numbers current.
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