“I agree with the appellant’s submission that D.B.S., supra, has made some changes to the legal regime that was in effect in Ontario at the time of the trial decision. In light of D.B.S., it is now clear that the trial judge erred in concluding the respondent had not engaged in blameworthy conduct. In D.B.S., Bastarache J. indicated that any conduct that privileges the payor parent’s own interests over his or her children’s right to an appropriate amount of support should be characterized as blameworthy conduct. While there is a presumption that the payor parent is acting reasonably by complying with the terms of a previous court order or agreement, this presumption may be rebutted where the change in circumstances is sufficiently pronounced. In determining the reasonability of the payor parent’s belief that his or her obligations were being met, the court should compare the amount the parent actually paid with how much he or she should have paid.
Applying this approach to this case, the respondent’s failure to report the increase in his income must be seen as blameworthy conduct given the magnitude of that increase.
The respondent’s blameworthy conduct in failing to report the increase in his income militates in favour of a retroactive award, but it is not determinative. It is only one of four factors Bastarache J. identified, at paras. 100-16, to be considered:
1. Reasonable excuse for why support was not sought earlier
2. Conduct of the payor parent
3. Circumstances of the child
4. Hardship occasioned by a retroactive award[.]
Importantly, Bastarache J. stressed at para. 99 of D.B.S., supra, “At all times, a court should strive for a holistic view of the matter and decide each case on the basis of its particular factual matrix.”