Depends on where you are. If your country’s safety net is relatively straightforward, a UBI system might be more trouble than it’s worth in the short run.
The system proposed for the USA, otoh, eliminated or reduced nearly every agency and program associated with our labyrinthine “welfare state”, including numerous investigative and judicial oversight branches. That prunes thousands of pages of legal code and regulations down to the minimum needed to determine everyone got the right sized check- fewer loopholes, fewer ways to chest, less need for investigation, enforcement and court cases. Even without raising taxes, reducing the beaurocracy by that much was calculated to result in a net increase in benefit to the recipients.
Of course, that UBI proposal had its own acknowledged flaws. By reducing EVERYTHING- SocSec, Medicare, Medicaid, WIC, etc. to a monthly check, you’re then depending on the recipients to make good decisions allocating that cash to necessities, not bread & circuses. If they don’t, you have a subset of citizens once again falling prey to the societal ills all those agencies were ostensibly created to combat.
Since we don’t live in an idealized world, a UBI program like the one proposed probably wouldn’t work. You’d still need some kind of institutional safety net, even if it’s skeletal in comparison to the current one. That + UBI = tax hike and/or other budget cuts.