I can't speak to the number itself, but the 2007 budget included an incentive for provinces to reduce their capital taxes by providing a limited period of time during which essentially the tax value or the value of the elimination of the provincial capital tax to the federal government, that is through the elimination of an otherwise deductible cost, would be made up to the provinces. The requirement was that they had to eliminate their capital tax before January 1, 2012, and the incentive, this amount, or the tax savings to the federal government for the period, would be paid over to them.
On May 28th, 2008. See this statement in context.