Summary
If you make 665,604 kr a year living in the region of Aalborg, Denmark, you will be taxed 233,390 kr. That means that your net pay will be 432,214 kr per year, or 36,018 kr per month. Your average tax rate is 35.1% and your marginal tax rate is 48.8%. 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 48.80 kr, hence, your net pay will only increase by 51.20 kr.
Bonus Example
A 1,000 kr bonus will generate an extra 512 kr of net incomes. A 5,000 kr bonus will generate an extra 2,560 kr of net incomes.