<sod >The fledgling party's draft policy framework, intended to spark debate among members ahead of the party's founding convention in May, includes a call for a flat 10-per-cent tax on income, which was brought in by Ralph Klein's former Progressive Conservative government before being officially scrapped by the NDP in 2015.< eod>< sod > The fledgling party's draft policy framework, intended to spark debate among members ahead of the party's founding convention in May, includes a call for a return to a flat 11.5-per-cent tax on income, which was brought in by Ralph Klein's former Progressive Conservative government before being officially scrapped by the NDP in 2015.< eod>