Tax
You may think that because the overall tax burden in
Belgium, expressed as a percentage of GDP, is quite 
high compared to other European countries, you’ll end 
up with less money in your pocket at the end of the 
month (see the section entitled Cost of living).
But tax revenue is deliberately invested in policies that 
benefit everyone, so you will ’get back’ any tax you pay 
in the form of other benefits for you and your family
(see the section entitled Key statistics on government spending).
In fact, compared to other countries, Belgium invests a sizeable 
proportion of its GDP in social protection, education and culture
Besides, researchers are eligible for very generous tax breaks!
The tax you pay will depend on your circumstances.
If you have an expat statute, for example, certain expense allowances (called expatriate allowances) relating to the temporary nature of your employment in Belgium are fully exempt from tax! For more information, see http://www.fiscuriosa.be/tax-topic-08092009.html
Research trainees are even exempt from paying any tax, subject to certain conditions. See the Research trainees section.
At the same time, despite your tax breaks, you and your family will still benefit from full social security coverage and the entire range of social services on offer.