Bill Gates said that no nation on earth is rich enough to afford basic income. It's a long way off.
The rich do not have enough money to pay for everyone else to be on the dole.
A universal income will affect behavior, and through that real GDP; at some levels, it may actually improve GDP by reducing job market friction and better allowing people to retrain, retool, and optimize their contribution and their own returns; OTOH, there's certainly a level at which it draws people out of the labor force in large enough quantities to overwhelm any advantage from reducing friction, crashing real, post-UBI GDP.
When taxes go up the money actually comes from middle and upper-middle class people who draw a paycheck, not from super-rich people whose net worth goes up by a billion dollars on a good market day and all without generating any taxable income.