you will find that out when they stand at your door
think it's different in each country.
you need to check the taxation pollicy of your country.
because if you get paid like 20.000 euro's worth on your bank account , i'm sure u will be visited by some person that wants to know where it came from and how.
because there is a rule in the world " it's a free world as long u pay your governement " no matter where you are.
My guess is you pay taxes once you withdraw the peds into your bank account .. (income tax)
Unless you are a business and issue invoices .. that you have to put on your books and pay taxes for even if you dont receive the payment .. at least in my country