Summary
If you make 640,900 kr a year living in the region of Ballerup, Denmark, you will be taxed 220,426 kr. That means that your net pay will be 420,474 kr per year, or 35,040 kr per month. Your average tax rate is 34.4% and your marginal tax rate is 48.6%. 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 48.57 kr, hence, your net pay will only increase by 51.43 kr.
Bonus Example
A 1,000 kr bonus will generate an extra 514 kr of net incomes. A 5,000 kr bonus will generate an extra 2,572 kr of net incomes.