Your calculation is missing the financial needs for the next three years. The federal government has a public deficit and other needs in relation to the debt payments, which amount to $103 billion, in total, over the next three years. We must then add the amount already included in the crown corporations' plans, meaning $43 billion over the next three years, and a contingency reserve of 5%, which is $56 billion. The total equals the amount established.
On May 8th, 2017. See this statement in context.