Question: how much tax will be deducted from my bonus in ontario?
Answer: That's because a bonus is taxed as income at your marginal rate. Llewellyn says the top marginal tax rates range between 39 percent in Alberta to a high of 46.4 percent in Ontario. That means someone in Ontario in the highest tax bracket who earns a $10,000 bonus would lose $4,640 right off the top in taxes.