Justice Strathy’s decision in Apotex Inc. v. Nordion (Canada) Inc. is one of the most important limitations decisions from the Court of Appeal since the Limitations Act came into force. It’s the first decision to make explicit that the Limitations Act doesn’t apply to causes of action, but to “claims” (as defined in s. 1 of the Limitations Act).
This distinction is most often missed by Ontario courts., which generally treat the cause of action and the “claim” as interchangeable for limitations purposes. I have written about this issue extensively (see this, for example), including the problems that result.
Justice Strathy noted one of those problems. Because damage is always an element of the “claim” but not of any cause of action based on conduct that is actionable per se, they accrue differently. A breach of contract is the most common example:
 Before the reform of limitations law brought about by the LA 2002, the previous statute, the Limitations Act, R.S.O. 1990, c. L.15, looked to when the cause of action arose (an expression not used in the LA 2002) to determine the commencement of the limitation period. The “cause of action” for breach of contract accrued on the date of the breach and the limitation period began to run on that date: see Graeme Mew, Debra Rolph & Daniel Zacks, The Law of Limitations, 3d ed. (Toronto: LexisNexis, 2016) at §9.6; Robert Simpson Co. Ltd. et al v. Foundation Co. of Canada Ltd. et al (1982), 1982 CanLII 1750 (ON CA), 36 O.R. (2d) 97 (C.A.), at p. 105; Schwebel v. Telekes, 1967 CanLII 163 (ON CA),  1 O.R. 541 (C.A.), at p. 544.
 This was the case whether or not damages had yet been incurred. Damages are not an essential element of the cause of action for breach of contract: Mars Canada Inc. v. Bemco Cash & Carry Inc., 2018 ONCA 239 (CanLII), 140 O.R. (3d) 81, at para. 32.
 Under the LA 2002, the limitation period for breach of contract does not necessarily run from the date of the breach. As I have observed, in contrast to the former statute, the date of the “act or omission” – the breach of contract itself – is not the only factor to be considered in determining when a claim is discovered under the LA 2002. Instead, the date on which the plaintiff knew of the occurrence of the act or omission is only one factor to be determined. In addition to that factor, the person with the claim must also know that the “injury, loss or damage had occurred” (s. 5(1)(a)(i)), that it was caused or contributed to by the act or omission (the breach of contract) (s. 5(i)(a)(ii)), and that the act or omission was that of the defendant (s. 5(1)(a)(iii)).
 As a result of the presumption under s. 5(2), the limitation period begins to run on the date of the breach (being the date of the “act or omission”), unless it is proven that the person with the claim did not know of one or more of the matters set out in s. 5(1)(a), and that a reasonable person would not have known of those matters.
 A plaintiff with a claim for breach of contract may displace the presumption in s. 5(2) if, for example, they establish that they did not know that “the injury, loss or damage” had occurred or, if it had occurred, they did not know that it was caused by an act or omission of the defendant – the breach of contract. But it is well-settled that the person need not know the extent of the injury, loss or damage to trigger the commencement of the limitation period. It is enough that they know that some damage has occurred. In Hamilton (City) v. Metcalfe & Mansfield Capital Corp., 2012 ONCA 156 (CanLII), 290 O.A.C. 42, at paras. 59-61, this court adopted the common law rule expressed in Peixeiro v. Haberman, 1997 CanLII 325 (SCC),  3 S.C.R. 549, at para. 18, that “some damage” is sufficient to start the running of the limitation period.
Justice Strathy set out the impact this has on a limitations analysis for a breach of contract: 91-92
 First, to determine when a claim is discovered in a breach of contract case, it is necessary to examine the terms of the contract and the nature of the alleged breach (the “act or omission”) on which the claim is based: see Mew, Rolph & Zacks, at §9.5, citing to NFC Acquisition L.P. v. Centennial 2000 Inc., 2010 ONSC 733, 67 B.L.R. 218, at paras. 29-30, affirmed in 2011 ONCA 43 (CanLII), 78 B.L.R. (4th) 11; Hopkins v. Stockman, 2013 SKCA 118 (CanLII), 427 Sask. R. 4, at para. 10. As van Rensburg J.A. noted in Morrison v. Barzo, at paras. 33, 49, the application of the test in s. 5(1)(a) requires the identification or definition of the claims at issue. This is a necessary starting point.
 Second, in many cases, the act or omission, causation, and the injury, loss or damage will occur simultaneously, and will be discovered simultaneously. But this will not always be the case. In some cases, discovery of the “act or omission” will not start the limitation period running unless injury, loss or damage has occurred and has been discovered (s. 5(1)(a)(i)).
To understand the significance of this decision, compare it to the Court’s description of discovery in Lawless:
 The principle of discoverability provides that “a cause of action arises for the purposes of a limitation period when the material facts on which it is based have been discovered, or ought to have been discovered, by the plaintiff by the exercise of reasonable diligence. This principle conforms with the generally accepted definition of the term ‘cause of action’ – the fact or facts which give a person a right to judicial redress or relief against another”:Aguonie v. Galion Solid Waste Material Inc. (1998), 1998 CanLII 954 (ON CA), 38 O.R. (3d) 161 (C.A.), at p. 170.
Here the Court describes discovery in terms of knowledge of the material facts of the cause of action, which is a statement of common law discovery, not discovery as codified in s. 5 of the Limitations Act. Apotex, together with recent decision in Gillham, suggests that the Court is moving away from the misconception that underlies reliance on Lawless.
Two other points:
- Justice Strathy’s decision begins with s. 2 of the Limitations Act. Because this is the provision that determines the application of the Limitations Act, this is the correct starting point for any limitations analysis. However, you rarely see courts considering it.
- It would have been helpful for the Court to include a paragraph explaining why the cause of action does not feature in the Limitations Act. It was a deliberate decision. The Legislature sought to resolve the enormous problems inherent in cause of action accrual by converting all causes of action into one unit, the claim. This also allowed for universal limitation periods, rather than limitation periods for different categories of causes of action.