If you make $ 5,000,000 a year living in Taiwan, you will be taxed $ 1,204,641. That means that your net pay will be $ 3,795,359 per year, or $ 316,280 per month. Your average tax rate is 24.1% and your marginal tax rate is 38.6%. 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 $ 38.64, hence, your net pay will only increase by $ 61.36.
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.