If you make 300,000,- kr a year living in the region of Tårnby, Denmark, you will be taxed 98,122, kr. That means that your net pay will be 201,878,- kr per year, or 16,823,- kr per month. Your average tax rate is 32.7% and your marginal tax rate is 38.5%. 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 38.47,- kr, hence, your net pay will only increase by 61.53,- kr.
A 1,000,- kr bonus will generate an extra 615,- kr of net incomes. A 5,000,- kr bonus will generate an extra 3,077,- kr of net incomes.