“Like any applicant seeking a retroactive variation under s. 17 of the Divorce Act, a payor seeking a downward retroactive change must first show a past change in circumstances, as required under s. 17(4). Section 14 of the Guidelines lists situations constituting a change in circumstances for the purpose of s. 17(4) of the Divorce Act, including the coming into force of the Guidelines (s. 14(c)). A change in circumstances could also include a change that, if known at the time, would probably have resulted in different terms, such as a drop in income (Guidelines, s. 14(a); Willick v. Willick, 1994 CanLII 28 (SCC), [1994] 3 S.C.R. 670, at p. 688; Gray, at para. 39).
The onus is on the party seeking a retroactive decrease to show a change in circumstances (Punzo v. Punzo, 2016 ONCA 957, 90 R.F.L. (7th) 304, at para. 26; Templeton, at para. 33). In some cases that may be relatively straightforward: for example, establishing that the children are no longer legally entitled to support because they are no longer children of the marriage.
Most commonly, the retroactive variation claim will be based on a material change in income. To meet the threshold, a decrease in income must be significant and have some degree of continuity, and it must be real and not one of choice (Willick, at pp. 687-88; Earle v. Earle, 1999 CanLII 6914 (B.C.S.C.), at para. 27; MacCarthy v. MacCarthy, 2015 BCCA 496, 380 B.C.A.C. 102, at para. 58, citing Earle; L.M.P. v. L.S., 2011 SCC 64, [2011] 3 S.C.R. 775, at para. 33; Gray, at para. 39; Brown v. Brown, 2010 NBCA 5, 353 N.B.R. (2d) 323 (“Brown”), at para. 2; Templeton, at para. 35). Trivial or short-lived changes are insufficient to justify a variation (Templeton, at para. 35). In this way, the threshold inquiry preserves some sense of certainty and predictability for the parties and the child, while allowing some flexibility in response to changes in the payor’s income.
The payor must have disclosed sufficient reliable evidence for the court to determine when and how far their income fell, and to ascertain whether the change was significant, long lasting, and not one of choice. A decision to retroactively decrease support can only be made based on “reliable, accurate and complete information” (Earle, at para. 28). The payor cannot ask the court to make findings on income that are contrary to the recipient’s interests “while at the same time shielding information that is relevant to the determination of their income behind a protective wall” (Templeton, at para. 67; see also Tougher v. Tougher, 1999 ABQB 552, at paras. 14-15 (CanLII); Terry, at para. 9).
Of course, a payor whose income was originally imputed because of an initial lack of disclosure cannot later claim that a change in circumstances occurs when he or she subsequently produces proper documentation showing the imputation was higher than the table amount for their actual income. The payor cannot rely on their own late disclosure as a change in circumstances to ground a variation order (Gray, at paras. 33-34). This would “defeat the purpose of imputing income in the first place” and act as “a disincentive for payors to participate in the initial court process” (Trang v. Trang, 2013 ONSC 1980, 29 R.F.L. (7th) 364, at para. 53).”