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Published: April 10, 2020

Last Updated: May 25, 2020

Introduction – Subsection 152(9) and Alternative Grounds of Assessment

During a typical tax dispute between a taxpayer and the CRA, the CRA will advance one or several grounds for the assessment or reassessment against a taxpayer. A ground for an assessment or a reassessment is the reason given by the CRA for assessing or reassessing the taxpayer for a different amount of tax owed than the taxpayer’s self-assessed amount. The grounds relied on by the CRA have to be given in either the Notice of Assessment or Notice of Reassessment sent out to the taxpayer. In response, if the taxpayer is successful in disputing the ground or grounds of his or her assessment or reassessment, the CRA would generally have to vacate their assessment or reassessment against the taxpayer.

However, this is not always the case. Subsection 152(9) of the Income Tax Act allows the CRA to advance an alternative argument in support of an assessment or a reassessment at any time after the normal reassessment period. The normal reassessment period for most taxpayers is defined in subsection 152(3.1) as three years after either the sent date of the original notice of assessment or the sent date of the original notification that no tax is payable, whichever date is earlier. However, for a taxpayer who is a mutual fund or a taxpayer who is a corporation other than a Canadian Controlled Private Corporation (CCPC), the normal reassessment period is four years after either the sent date of the original notice of assessment or the sent date of the original notification that no tax is payable, whichever date is earlier. Paragraphs 152(9)(a) and (b) provide two exceptions to the general rule laid out in 152(9). Subsection 152(9) is not applicable when (a) relevant evidence exists that the taxpayer is no longer able to adduce without leave of the court, or (b) it is not appropriate in the circumstances for the court to order that the evidence be adduced.

Background of Subsection 152(9) – The Continental Bank Rule

Subsection 152(9) was passed by the Federal Government in response to the Supreme Court of Canada’s ruling in Continental Bank of Canada v Canada. In Continental Bank, the Crown tried to advance an alternative basis for reassessment using its general reassessment power set out in subsection 152(4) after its initial basis for reassessment failed at the Court of Appeal. The Supreme Court ruled that, since subsection 152(3.1) sets out the normal reassessment period, and that period expired; therefore the Crown is not permitted to advance a new basis for reassessment. Allowing the Crown to reassess after the expiration of the limitation period would be “tantamount to allowing the Minister to appeal his own assessment, a notion which has specifically been rejected by the courts.”

Subsection 152(9) and Common Law rules – Canada v Last and the Rule against Increasing Tax Liability from Alternative Sources

Subsection 152(9) overrules Continental Bank and grants the CRA a virtually unlimited period of time to advance a new basis for reassessment except for the two explicit exceptions contained in paragraphs (a) and (b). However, in Canada v Anchor Point Energy Ltd., the Court of Appeal ruled that subsection 152(9) cannot be used to assess the taxpayer for more tax than the CRA had originally assessed the taxpayer during the limitation period. The rule that a taxpayer’s appeal cannot result in more tax liability than the initial assessment within the limitation period is a common law rule. However, the question remains whether, if the taxpayer’s appeal successfully lowers his or her liability from a given source, the CRA can use subsection 152(9) to increase tax liability on alternative sources without increasing the taxpayer’s overall tax liability. In Canada v Last, the Court answered this question: Although the Crown’s proposed reassessment from a new source does not increase the overall tax liability of the taxpayer, the Crown is prohibited from conducting such a reassessment by the common law rule.

2016 Revision of Subsection 152(9) – Parliament Attempts to Override Canada v Last

In response to Canada v Last, Parliament amended subsection 152(9) in the 2016 budget to include the phrase “including that all or any portion of the income to which an amount relates was from a different source … in support of all or any portion of the total amount determined on assessment to be payable or remittable by a taxpayer under this Act.” The 2016 amendment was arguably intended to overrule Canada v Last to make it permissible for the CRA to use subsection 152(9) to increase tax liability from different sources if a taxpayer is successful in lowering his or her liability from one source. Such power could render a taxpayer’s otherwise successful appeal practically meaningless. However, it remains to be seen if the Courts accept the 2016 amendment as successfully overruling Canada v Last.

Another limitation of subsection 152(9) power is procedural fairness. In Aeronautic Development Corporation v Canada, the Crown tried to use subsection 152(9) to advance a new argument that it did not plead in the pleadings. The Tax Court of Canada ruled that this use of subsection 152(9) is procedurally unfair and disallowed the Crown from making this new argument. However, the Court in Aeronautic did not give specific criteria for procedural fairness other than that procedural fairness is to be decided within the context of each case.

Tax Tips – The Importance of Formulating Your Tax Dispute Strategy in Light of Subsection 152(9)

During a tax dispute between the taxpayer and the CRA, it would be prudent for the taxpayer to plan for the possibility that the CRA might invoke its subsection 152(9) powers. This means considering all possible grounds in which the CRA may assess or reassess the taxpayer from all potential sources of the taxpayer’s tax liabilities.

However, CRA’s subsection 152(9) power is not unlimited. As discussed above, the courts have yet to decide on whether the 2016 amendment to subsection 152(9) has successfully overruled the common law rule against increasing taxpayer’s tax liability from different sources without increasing the taxpayer’s overall tax liability. Furthermore, depending on the circumstances of the tax dispute, the common law rule of procedural fairness as well as Tax Court of Canada Rules (General Procedure) can also place constraints on CRA’s ability to advance alternative grounds for assessment or reassessment. For example, in an appeal to the Tax Court, section 89(1) of Tax Court of Canada Rules prevents either party from adducing new evidence after the conclusion of the discovery of documents without the consent of the other party or the leave of the Court. This rule may prevent the CRA from adducing fresh evidence to support alternative grounds for assessment or reassessment during an appeal to the Tax Court.

Since subsection 152(9) tips the litigation in favor of the Crown, taxpayers will be well served by having experienced Canadian tax lawyers on their side. We can guide you through the intricacies of a Tax Court Appeal and challenge use of the CRA’s subsection 152(9) power to reassess beyond the normal reassessment period.


"This article provides information of a general nature only. It is only current at the posting date. It is not updated and it may no longer be current. It does not provide legal advice nor can it or should it be relied upon. All tax situations are specific to their facts and will differ from the situations in the articles. If you have specific legal questions you should consult a lawyer."

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