Summary
If you make € 12,426,708 a year living in Finland, you will be taxed € 7,836,802. That means that your net pay will be € 4,589,906 per year, or € 382,492 per month. Your average tax rate is 63.1% and your marginal tax rate is 63.2%. 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 € 63.18, hence, your net pay will only increase by € 36.82.
Bonus Example
A € 1,000 bonus will generate an extra € 368 of net incomes. A € 5,000 bonus will generate an extra € 1,841 of net incomes.