If you make 300,000 kr a year living in the region of Vejle, Denmark, you will be taxed 92,478 kr. That means that your net pay will be 207,522 kr per year, or 17,294 kr per month. Your average tax rate is 30.8% and your marginal tax rate is 30.9%. 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 30.88 kr, hence, your net pay will only increase by 69.12 kr.
A 1,000 kr bonus will generate an extra 691 kr of net incomes. A 5,000 kr bonus will generate an extra 3,456 kr of net incomes.