If you make 300,000 kr a year living in the region of Ringsted, Denmark, you will be taxed 99,065 kr. That means that your net pay will be 200,935 kr per year, or 16,745 kr per month. Your average tax rate is 33.0% and your marginal tax rate is 33.1%. 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 33.12 kr, hence, your net pay will only increase by 66.88 kr.
A 1,000 kr bonus will generate an extra 669 kr of net incomes. A 5,000 kr bonus will generate an extra 3,344 kr of net incomes.