Tax all depends on your country of residence and the country of registration of the birds. For us in the "other big fractional operator" it means that some colleagues have to pay national tax (difference) in their countries of residence on top of the tax that is being witheld in the country where the company is operating from. There's still a handful of countries where you pay no additional tax. So think well where you want to live or those nice gross salaries will be halved by tax and social security.