Finland currently has unemployment at 5.4% and working age economic inactivity (i.e. people who do not pay income tax but are also mostly not eligible for benefits) is closer to 30%.
If the state is paying out the equivalent of a livable income to >5x as many working age people as before that's a big increase in [net] income tax burden on the employed. Given that many of these economically inactive people are not looking for work by choice (probably because they don't need the money), there's a big question over whether that's an income tax burden worth imposing.
It is true that the best place to fund UBI is not from a pure income tax. In the same way raising the minimum wage inflates the general cost of goods, but at a lesser rate than the poorest earners see their incomes rise, having a UBI with a (preferably progressive with annual per-capita credit) generalized transnational / sales / exchange tax across the whole economy would work better. That would include income, but it wouldn't exclude capital gains, trade, consumer purchase, etc.
Finland currently has unemployment at 5.4% and working age economic inactivity (i.e. people who do not pay income tax but are also mostly not eligible for benefits) is closer to 30%.
If the state is paying out the equivalent of a livable income to >5x as many working age people as before that's a big increase in [net] income tax burden on the employed. Given that many of these economically inactive people are not looking for work by choice (probably because they don't need the money), there's a big question over whether that's an income tax burden worth imposing.