Right, I don't really know how it is in other countries, but in France, the subsidies for poor people (that's obviously a shortcut and is more complicated) don'

Right, I don't really know how it is in other countries, but in France, the subsidies for poor people (that's obviously a shortcut and is more complicated) don't go through income tax but other systems. There is only one thing that applies to everyone which is work-related expanses (like the fuel cost to go to your work), but which has a 10% rebate if you don't declare anything, so you declare only if it's higher than that. I would guess maybe 20% of people can go through the fully automatic part, but I have no source for that.