Having looked at the chart, I have several questions.
1) The FD is "not taxed", but in a sense, it kind of is. It takes up the first $12,000 of income (and is not taxed), but then all of your earned income gets pushed up into higher brackets. Hence, to truly not be taxed, it should be just Disposal income + $12,000, but it's slightly less. What is the purpose of pushing people into higher tax brackets? Seems like a lot of hassle for what ultimately is a really small effective tax on UBI.
2) Does the UBI really increase spending power if it's given to everyone? Don't we have to worry about inflation? I realize $12,000 will help me more than Jeff Bezos, but why does he get it as well?
I think parts of the UBI are a good idea. For one, I have learned recently that there are a lot of people in disability limbo. They are either denied disability, waiting on an application to process, or between jobs. The UBI is an easy way to fill in the gaps so people feel less pressure.
But I worry a lot about inflation.