Summary
If you make 1,598,400,960 원 a year living in South Korea, you will be taxed 721,867,388 원. That means that your net pay will be 876,533,572 원 per year, or 73,044,464 원 per month. Your average tax rate is 45.2% and your marginal tax rate is 47.9%. 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 47.87 원, hence, your net pay will only increase by 52.13 원.
Bonus Example
A 1,000 원 bonus will generate an extra 521 원 of net incomes. A 5,000 원 bonus will generate an extra 2,607 원 of net incomes.