Without going into personal details, let's say my taxable income is in the second tax bracket. In Canada, it's from $46K to $93K and in Quebec (I pay both) it's from $43K to $86K. For argument sake, let's says $50K. According to the tax tables, the rates are respectively 20.5% and 20% for 2018, for a total of 40.5%. Yet when I add $1000 of income, TurboTax adds around $380 or 38% to the total tax amount, therefore close to the amount predicted according to the tax table.
The definition of the marginal tax rate is the rate charged on the next dollar. Clearly, in my case, it's 40.5% or 38%. But TurboTax says it's 24% and the average is 22%. This is clearly wrong. I checked my 2017 return, and the same situation applies.
