If you make 300,000,- kr a year living in the region of Albertslund, Denmark, you will be taxed 103,378, kr. That means that your net pay will be 196,622,- kr per year, or 16,385,- kr per month. Your average tax rate is 34.5% and your marginal tax rate is 40.7%. 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 40.65,- kr, hence, your net pay will only increase by 59.35,- kr.
A 1,000,- kr bonus will generate an extra 594,- kr of net incomes. A 5,000,- kr bonus will generate an extra 2,968,- kr of net incomes.