Summary
If you make $ 4,453,840 a year living in Taiwan, you will be taxed $ 993,591. That means that your net pay will be $ 3,460,249 per year, or $ 288,354 per month. Your average tax rate is 22.3% and your marginal tax rate is 38.7%. 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 $ 38.65, hence, your net pay will only increase by $ 61.35.
Bonus Example
A $ 1,000 bonus will generate an extra $ 614 of net incomes. A $ 5,000 bonus will generate an extra $ 3,068 of net incomes.