Simply put you give everyone X amount. We’ll use 100 because it’s easy. Then you tax it back on a sliding scale. At the low end they keep the entire 100 dollars. At the high end it is all paid back. In the middle you’d get 100 dollars and owe 50 back in taxes.

This actually removes a lot of the administrative overhead and allows UBI to circulate a lot more money than you’re actually paying into it.

Less simply, I’ll let this guy explain it.