But the figure is, frankly, a silly one. That would be the cost assuming no income tax changes at all. You can shift the tax thresholds and rates to make it a net 0 change for everyone earning over some figure.
I see that as the basic problem in this discussion.
Proponents of UBI say "everyone will receive $X per month". When people ask "how will this be paid for?", the answer is always "changes to tax schedules, savings on social programs", but this tells us nothing without details.
