Summary
If you make $ 1,800,000 a year living in Taiwan, you will be taxed $ 260,559. That means that your net pay will be $ 1,539,441 per year, or $ 128,287 per month. Your average tax rate is 14.5% and your marginal tax rate is 21.6%. 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 $ 21.55, hence, your net pay will only increase by $ 78.45.
Bonus Example
A $ 1,000 bonus will generate an extra $ 785 of net incomes. A $ 5,000 bonus will generate an extra $ 3,923 of net incomes.