If you make 300,000,- kr a year living in the region of Vejle, Denmark, you will be taxed 99,255, kr. That means that your net pay will be 200,745,- kr per year, or 16,729,- kr per month. Your average tax rate is 33.1% and your marginal tax rate is 38.9%. 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 38.94,- kr, hence, your net pay will only increase by 61.06,- kr.
A 1,000,- kr bonus will generate an extra 611,- kr of net incomes. A 5,000,- kr bonus will generate an extra 3,053,- kr of net incomes.