Historical VAT rates GST Rates. 5% GST since January 1 st, 2008; 6% GST from July 1 st, 2006 to December 31 st, 2007; 7% GST from January 1 st, 1991 to June 30 th, 2006; QST Rates. 9.975% QST since January 1 st, 2013 (on an amount before GST) 9.5% QST from January 1 st, 2012 to December 31 st, 2012; 8.5% QST from January 1 st, 2011 to December ...