If you make 300,000,- kr a year living in the region of Frederiksberg, Denmark, you will be taxed 97,321, kr. That means that your net pay will be 202,679,- kr per year, or 16,890,- kr per month. Your average tax rate is 32.4% and your marginal tax rate is 38.1%. 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 38.13,- kr, hence, your net pay will only increase by 61.87,- kr.
A 1,000,- kr bonus will generate an extra 619,- kr of net incomes. A 5,000,- kr bonus will generate an extra 3,094,- kr of net incomes.