Summary
If you make 20,820,010 ₫ a year living in Vietnam, you will be taxed 3,117,797 ₫. That means that your net pay will be 17,702,214 ₫ per year, or 1,475,184 ₫ 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 14.97 ₫, hence, your net pay will only increase by 85.03 ₫.
Bonus Example
A 1,000 ₫ bonus will generate an extra 850 ₫ of net incomes. A 5,000 ₫ bonus will generate an extra 4,252 ₫ of net incomes.