If you make $ 6,000,000 a year living in Taiwan, you will be taxed $ 1,613,747. That means that your net pay will be $ 4,386,253 per year, or $ 365,521 per month. Your average tax rate is 26.9% and your marginal tax rate is 39.5%. 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 $ 39.50, hence, your net pay will only increase by $ 60.50.
A $ 1,000 bonus will generate an extra $ 605 of net incomes. A $ 5,000 bonus will generate an extra $ 3,025 of net incomes.