If you make 300,000,- kr a year living in the region of Hillerød, Denmark, you will be taxed 103,163, kr. That means that your net pay will be 196,837,- kr per year, or 16,403,- kr per month. Your average tax rate is 34.4% and your marginal tax rate is 40.6%. This marginal tax rate means that your immediate additional income will be taxed at this rate. For instance, an increase of 100,- kr in your salary will be taxed 40.56,- kr, hence, your net pay will only increase by 59.44,- kr.
A 1,000,- kr bonus will generate an extra 594,- kr of net incomes. A 5,000,- kr bonus will generate an extra 2,972,- kr of net incomes.