Summary
If you make $299,949 a year living in the region of Ontario, Canada, you will be taxed $127,958. That means that your net pay will be $171,991 per year, or $14,333 per month. Your average tax rate is 42.7% and your marginal tax rate is 53.0%. This marginal tax rate means that your immediate additional income will be taxed at this rate. For instance, an increase of $100 in your salary will be taxed $53, hence, your net pay will only increase by $47.
Bonus Example
A $1,000 bonus will generate an extra $470 of net incomes. A $5,000 bonus will generate an extra $2,350 of net incomes.