Salary after Tax

Hi everyone!

I need to understand the net monthly salary of the offer I received.

They suggest [https://www.calculatrice.lu/calculator](https://www.calculatrice.lu/calculator) but I also found [https://salaryaftertax.com/lu/salary-calculator](https://salaryaftertax.com/lu/salary-calculator), and the final amount is different.

Can you help me figure out the correct final amount?

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Thank you!