Normally Universal basic income plans are combined with abolition of most other welfare, and changes to taxes so that people on all but the lowest incomes end up paying the money back as tax. So maybe flatten all tax rates below 24%, everyone earning more than $80000 is now paying an extra $6000, but you give that back to them as the UBI. Everyone earning less than $80000 pays more tax than before but still gets $6000 UBI, so is better off.