Universal Basic Income (UBI) at it's core increases income for everyone - universally.
What you're thinking about is a negative income tax or some other BI that is disproportionately weighted.
What you're thinking about is a negative income tax or some other BI that is disproportionately weighted.
Many people (the wealthy) will have their net income (income after taxes) go down considerably in a UBI system.
For example, everyone gets $12k a year in UBI income, however funding such a system will require a fairly stiff tax increase (this is how the wealth redistribution will occur), so for high earners, their $12k in UBI will be negatively offset by the increase in taxes.
As an extreme example, someone earning $1MM annually will get the $12k UBI same as everyone else, but an (example) increase in the top income bracket from 39.6% to 60% will cause them to pay $118646.4 more in taxes resulting in their net income under a UBI system to go down (-$118646.40 taxes + $12000 ubi) $106646.40.