TK costs are based on your (pre-tax) income - and your employer pays for half! You also can't pay more than 427,66 - that's the upper bound no matter how much you earn. Some examples below (this is the cost that you'd be paying):

Income: 851 - TK cost: 80,25 Euros
Income: 1000 - TK cost: 94,25 Euros
Income: 1500 - TK cost: 141,38 Euros
Income: 2000 - TK cost: 188,50 Euros
Income: 3000 - TK cost: 282,75 Euros
Income: 4000 - TK cost: 377,00 Euros
Income: 5000 - TK cost: 427,66 Euros

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