Same in Germany, although almost everybody is entitled to something. This must be why you get a default amount deducted for certain things. It must prevent labor-intensive tax declarations for very small refunds.

I built a tax calculator for English speakers, and highlighting that is next on my todo list. Many people pass up on significant returns, especially parents.

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.