What kind of deduction would you like to do? I have a belgian salary. From my house credit, I can deduct 2800 per year, and because my income is taxed up to 50%, I can get back 50% of that amount each year. Namely, thanks to this deduction, I get 1400 euros back from the state each year. In other word, it is like if I earned 120 euros more per month... hum hum, compared to eurocontrol salaries.... it means nothing!!
What do you wanna deduct else?
In Eurocontrol, if you have 2 children and a non working wife, you'll get about 1500 euros extra per month? In belgium, guess how many? 342 euros!!!
So deduction or not, it is nothing compared to such salaries and Eurocontrol still has very good salaries