I think you are unsure of how UBI works. It is not paying people to stay at home, it is just a modification of tax brackets, such that people below a certain level pay negative taxes, aka receive money to live and survive. Unlike now, where everyone has to pay taxes, even the poor.

UBI does not need an increase in taxes, just a proper tiering of it, such that the ultra rich pay more to support society better. By having people who pay negative taxes, they are not burdened with living paycheck to paycheck and can focus on improving their lives. If you are working, saving and paying your proportionate taxes, UBI should not affect you in any way.

It's just a fix for rampant capitalism, where the rich are supposedly working millions of times harder than their exploited working class.