It depends on how it is implemented and the numbers involved.
One proposal [1] would be to give everyone $US 10K per year starting at age 21, and not having income taxes start until you have an income over US$ 40K.
This allows one to get get enough for the bare necessities (shelter, food) "for free", but if you want to have a life that's more than just subsistence living, you would have to work--but you get to keep a lot of that upfront.
If you want a 'fancy' life, then you'll have to work more, and there would be personal income taxes. Presumably there would be corporate and sales taxes as well.
I don't know enough about the math to know if it is practical.
[1] https://www.theatlantic.com/politics/archive/2014/08/why-are...