Why tax isn't a flat percentage
Canadian income tax is progressive and stacked: the federal government and your province each have their own brackets. Only the income within each bracket is taxed at that bracket's rate. The basic personal amount shelters the first portion of income from tax at both levels.
Common questions
Your marginal rate is the rate on your next dollar earned (federal + provincial). Your average rate is total tax divided by income — always lower.
14% up to $58,523, 20.5% to $117,045, 26% to $181,440, 29% to $258,482, and 33% above that, after the basic personal amount.
It applies the Quebec brackets and the 16.5% federal abatement, but not every Quebec-specific credit. Treat it as an estimate.