UBIDeGrauwe

Arguments

He argues based on calculations in [1] that:

We still need to fill in a gap of 35 billion euros (we give everyone a basic income and deduce the unnecessary costs of the government)
This would mean that the tax pressure would go from 50% to 60% of the bbp which is unsustainable
A working majority receives a basic income that is independent of the labour effort, but will have to pay extra taxes (and not a little bit) for their labour. And that is the best way to demotivate to go to work.

There is extra income to be found in extra jobs in the private sector + if 15% of the children is raised in poverty, don't they provide a tremendous potential + ...
Who says the 50% of the government capacity can not be decreased?
We are already doomed at more than 50% -> we are sleepwalking towards 60 right now, with 54 already
The most important motivation for work is not the income. The income should be righteous. Motivation is more like: being able to work independent, being able to feel your place in the organisation (e.g. by communicating with peers, ...) , have the right competences, ....
If you compare wages in Belgium right now, then you can see that for a diverse range of professions, the wages are not that far from each other either.
Even if we tax more on labour with a basic income, the end result might still be less taxes.