Keep in mind that, under many current programs, you are not allowed to have savings. If you do not use all of your welfare money, then you get your benefits cut. If you have too much in your savings account, then you get your benefits cut. So it's not so simple as to say they have difficulty managing money, it's that they are not allowed to do many of the things you'd associate with successful money managing.
Under many current basic income programs, or just under other welfare programs? My impression of basic income schemes is that they are universal - they don't care if you're a millionaire, you still get your $30K per year.
Yeah. My attribution of these issues to saving skills only applies in a UBI context, iff the scheme doesn't force people into particular spending patterns as some current welfare systems do.