The trouble with the UBI is that the utopia it promises is a deceit. Replacing our complex system of welfare benefits with a single equal payment for everyone means one of two things: either the universal basic income is too low to replace the benefits that people need or, if it is high enough not to leave those people out of pocket, it costs much more than the present system we have. If it is the former, then the universal basic income removes money from many of the most vulnerable people in society. If it is the latter, then it gives extra money to people who do not need it (source)