Summary
If you make 50,000,000 ₫ a year living in Vietnam, you will be taxed 7,487,500 ₫. That means that your net pay will be 42,512,500 ₫ per year, or 3,542,708 ₫ per month. Your average tax rate is 15.0% and your marginal tax rate is 15.0%. 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 14.98 ₫, hence, your net pay will only increase by 85.02 ₫.
Bonus Example
A 1,000 ₫ bonus will generate an extra 850 ₫ of net incomes. A 5,000 ₫ bonus will generate an extra 4,251 ₫ of net incomes.