If you make 300,000,- kr a year living in the region of Herlev, Denmark, you will be taxed 99,568, kr. That means that your net pay will be 200,432,- kr per year, or 16,703,- kr per month. Your average tax rate is 33.2% and your marginal tax rate is 39.1%. 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 39.07,- kr, hence, your net pay will only increase by 60.93,- kr.
A 1,000,- kr bonus will generate an extra 609,- kr of net incomes. A 5,000,- kr bonus will generate an extra 3,047,- kr of net incomes.