The 1996 taxation year is the most recent year for which data are available. (a) In that taxation year, 13.99% of the total net federal income tax was payable by the highest 1% of income earners; (b) 49.05% of total net federal income tax was payable by the highest 10% of income earners; (c) 31.95% of individuals did not have any income tax to pay.
In the House of Commons on December 2nd, 1998. See this statement in context.