(Posted August 2026)
An acquisition of control (AoC) is a frequently tested topic on the CPA Common Final Examination (CFE) because it triggers several significant tax implications. While candidates may recognize that control has changed, responses may lack the required level of depth because the tax rules were not thoroughly discussed.
This technical spotlight outlines the key rules related to an acquisition of control and highlights common issues to be aware of when addressing this topic.
Acquisition of Control – Overview
An AoC generally occurs when a shareholder or a group of shareholders acquires de jure control of a corporation, typically through ownership of more than 50% of the voting shares. An AoC may arise through the purchase of shares, certain amalgamations or reorganizations, or transactions involving related parties.
There may be no AoC, such as, but not limited to, in some situations when a shareholder that has control:
- Increases their control,
- Reduces their control but does not lose control,
- Loses control but no other shareholder or group of shareholders acquires control, or
- Transfers their shares to another entity (e.g., a trust, another corporation, themselves, etc.) that they also control
The determination of control is based on voting control, not economic ownership.
Deemed Taxation Year-End
An AoC results in a deemed taxation year-end immediately before control is acquired. As a result:
- Income must be reported up to the deemed year-end
- Accruals and reserves may need to be adjusted
- Deductions (e.g., capital cost allowance (CCA), the small business deduction, etc.) may be prorated for the short taxation year
- The expiry of non-capital losses and other carry-forward balances may be accelerated
- Filing deadlines may be accelerated
The corporation may select a new taxation year-end that can be any date within 53 weeks of the deemed year-end.
Accrued Losses and Loss Restriction Rules
Immediately before control is acquired, certain accrued losses are recognized or crystallized for tax purposes, such as:
- For depreciable property where the undepreciated capital cost (UCC) is greater than the fair market value (FMV), the UCC is reduced to FMV (reducing income or increasing non-capital loss)
- For capital property where the adjusted cost base (ACB) is greater than the FMV, the ACB is reduced to the FMV (reducing net capital gains or increasing net capital loss)
- For other property, if the recorded amount is greater than the FMV, the tax basis is reduced to FMV (reducing income or increasing non-capital loss)
The recognition of these accrued losses may increase the corporation’s non-capital and/or net capital loss balances and one of the most significant consequences of an AoC relates to loss utilization. Key rules include:
- Non-capital losses may be carried forward but the use is restricted (i.e., they can generally only be applied again income from the same or a similar business)
- Net capital losses incurred before the AoC generally expire
These rules are intended to prevent loss trading. However, there are elections that can be made to trigger capital gains or the recapture of CCA, prior to the AoC, to minimize or eliminate the impact of these loss restriction rules.
Election to Trigger Capital Gains
There are also opportunities to utilize accrued gains if it is beneficial. For example, an election may be filed to allow the corporation to trigger a capital gain (where the ACB is less than the FMV) to utilize capital losses that would otherwise expire because of the AoC.
Loss of Private Company Status
If control is acquired by a non-resident private company or a public company (whether foreign or Canadian), the acquired corporation may lose certain statuses (e.g., Canadian-controlled private corporation (CCPC), qualified small business corporation (QSBC), etc.). Prior to the AoC, planning should be done to utilize any balances that may only be available to private corporations, such as:
- Declaring dividends and electing to designate the dividend as a capital dividend to use the capital dividend account balance if private company status will be lost because of the AoC
- Declaring taxable dividends to use the eligible refundable dividend tax on hand (ERDTOH) and non-eligible refundable dividend tax on hand (NERDTOH) account balances if private company status will be lost because of the AoC
- Triggering a capital gain on QSBC shares so individual shareholders can utilize their lifetime capital gain exemption if QSBC status will be lost because of the AoC
Other implications if CCPC status is lost:
- Loss of the small business deduction
- Loss of the enhanced scientific research and experimental development (SR&ED) input tax credit (ITC) rate
- Tax payments will be due two months after the taxation year-end (instead of three months if there is active business income)
Case Writing Tips
When AoC issues arise on the CFE, candidates should:
- Use the case facts to identify whether de jure control has been acquired. Avoid assuming that a change in share ownership automatically results in an AoC.
- Discuss the implications of the AoC focusing on relevant issues based on the case facts (e.g., loss of private company status).
- Whenever possible, discuss the planning opportunities (e.g., available elections to use) to minimize the negative impact of the AoC.