Summary
If you make 474,499,992 원 a year living in South Korea, you will be taxed 185,457,361 원. That means that your net pay will be 289,042,631 원 per year, or 24,086,886 원 per month. Your average tax rate is 39.1% and your marginal tax rate is 46.1%. 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 46.14 원, hence, your net pay will only increase by 53.86 원.
Bonus Example
A 1,000 원 bonus will generate an extra 539 원 of net incomes. A 5,000 원 bonus will generate an extra 2,693 원 of net incomes.