If you make 300,000,- kr a year living in the region of Assens, Denmark, you will be taxed 104,648, kr. That means that your net pay will be 195,352,- kr per year, or 16,279,- kr per month. Your average tax rate is 34.9% and your marginal tax rate is 41.2%. 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 41.18,- kr, hence, your net pay will only increase by 58.82,- kr.
A 1,000,- kr bonus will generate an extra 588,- kr of net incomes. A 5,000,- kr bonus will generate an extra 2,941,- kr of net incomes.