Summary
If you make 201,000,020 원 a year living in South Korea, you will be taxed 62,958,245 원. That means that your net pay will be 138,041,775 원 per year, or 11,503,481 원 per month. Your average tax rate is 31.3% and your marginal tax rate is 43.8%. This marginal tax rate means that your immediate additional income will be taxed at this rate. For instance, an increase of 100 원 in your salary will be taxed 43.77 원, hence, your net pay will only increase by 56.23 원.
Bonus Example
A 1,000 원 bonus will generate an extra 562 원 of net incomes. A 5,000 원 bonus will generate an extra 2,812 원 of net incomes.