If you make 100,000,- kr a year living in the region of Kalundborg, Denmark, you will be taxed 22,544, kr. That means that your net pay will be 77,456,- kr per year, or 6,455,- kr per month. Your average tax rate is 22.5% and your marginal tax rate is 40.2%. 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 40.17,- kr, hence, your net pay will only increase by 59.83,- kr.
A 1,000,- kr bonus will generate an extra 598,- kr of net incomes. A 5,000,- kr bonus will generate an extra 2,992,- kr of net incomes.