Summary
If you make € 12,540,320 a year living in Luxembourg, you will be taxed € 5,914,557. That means that your net pay will be € 6,625,764 per year, or € 552,147 per month. Your average tax rate is 47.2% and your marginal tax rate is 47.2%. This marginal tax rate means that your immediate additional income will be taxed at this rate. For instance, an increase of € 100 in your salary will be taxed € 47.18, hence, your net pay will only increase by € 52.82.
Bonus Example
A € 1,000 bonus will generate an extra € 528 of net incomes. A € 5,000 bonus will generate an extra € 2,641 of net incomes.