Summary
If you make 673,920,000 ₫ a year living in Vietnam, you will be taxed 182,627,455 ₫. That means that your net pay will be 491,292,545 ₫ per year, or 40,941,045 ₫ per month. Your average tax rate is 27.1% and your marginal tax rate is 33.1%. 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 33.07 ₫, hence, your net pay will only increase by 66.93 ₫.
Bonus Example
A 1,000 ₫ bonus will generate an extra 669 ₫ of net incomes. A 5,000 ₫ bonus will generate an extra 3,347 ₫ of net incomes.