As far as I know, there has not been a specific magnitude developed, but what we do know, for example, with the children's fitness tax credit, is that most of the low and middle-income households don't even know that the credit exists, and where it is known that it does exist, a lot of the costs are actually falling onto the programs that administer sport for children, which are having to provide information and determine whether or not their program in fact complies with the tax credit so that they can administer receipts to families.
On November 17th, 2014. See this statement in context.