CRA notes that basis averaging can adversely affect the bump under the new s. 88(1)(d) bump rules

Suppose that Parent wishes to "bump" the cost of 3,000 shares of a public company which Target held at the time of Parent’s acquisition of control of Target.  CRA notes that as a result of the revised bump limit in draft s. 88(1)(d)(ii), a purchase of additional shares of the public company by Target at a high cost before Target is wound-up will reduce the bump limit for the 3,000 shares because their cost amount will be increased under the (s. 47) basis averaging rules.

Neal Armstrong.  Summary of 23 April 2013 T.I. 2012-0461741E5 under s. 88(1)(d)(ii).