Summary
If you make 14,126,667 원 a year living in South Korea, you will be taxed 1,690,653 원. That means that your net pay will be 12,436,014 원 per year, or 1,036,334 원 per month. Your average tax rate is 12.0% and your marginal tax rate is 12.7%. 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 12.66 원, hence, your net pay will only increase by 87.34 원.
Bonus Example
A 1,000 원 bonus will generate an extra 873 원 of net incomes. A 5,000 원 bonus will generate an extra 4,367 원 of net incomes.