If you make 300,000 kr a year living in the region of Billund, Denmark, you will be taxed 93,910 kr. That means that your net pay will be 206,090 kr per year, or 17,174 kr per month. Your average tax rate is 31.3% and your marginal tax rate is 31.4%. 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 31.37 kr, hence, your net pay will only increase by 68.63 kr.
A 1,000 kr bonus will generate an extra 686 kr of net incomes. A 5,000 kr bonus will generate an extra 3,432 kr of net incomes.