I'm going to open last year's return and change the province to compare.Can't speak to Sask or BC, but in AB, it's a flat 10%... Maybe the difference you see incorporates some recognition of the various additional taxes in BC
SK is 11-15% and I'm in the 26% Fed bracket. and 13% Provincially
11% on the first $43,292 of taxable income, +
13% on the next $80,400, +
15% on the amount over $123,692
British Columbia
5.06% on the first $37,606 of taxable income, +
7.7% on the next $37,607, +
10.5% on the next $11,141, +
12.29% on the next $18,504, +
14.7% on the next $45,142, +
16.8% on the amount over $150,000