Further to my post below in income splitting I encourage you to check out this post on Garth "Mr. Income Splitting" Turner's blog.
...If we restrict this to two-parent families with children under 18 years of age, the cost would be $1.561 billion per year, based on 2005 numbers. Of that, two-thirds of the cost would go to benefit double-income families, and the remaining amount for the 26% of all families that have just one income. The greatest number of people to benefit would be in the income range of $60,000 to $80,000 per year.
I agree with his assessment that the family unit is the basic economic unit of society and we need a tax regime that is much more pro-family for a myriad of reasons - many laid out in Mr. Turner's post.
