Summary
If you make 1,999,920 Kč a year living in Czech Republic, you will be taxed 485,144 Kč. That means that your net pay will be 1,514,776 Kč per year, or 126,231 Kč per month. Your average tax rate is 24.3% and your marginal tax rate is 23.2%. This marginal tax rate means that your immediate additional income will be taxed at this rate. For instance, an increase of 100 Kč in your salary will be taxed 23.15 Kč, hence, your net pay will only increase by 76.85 Kč.
Bonus Example
A 1,000 Kč bonus will generate an extra 769 Kč of net incomes. A 5,000 Kč bonus will generate an extra 3,843 Kč of net incomes.