Tabs with money still owed on them at close time: T8 · $92.00 left of $142.00 · 2.4 h open · Demo Server. A tab from an earlier night reads CARRIED in red.
Settle or void them on the floor and the card empties. Or admit them: the close button walks the admissions one at a time, and closing over open tabs goes on the record.
Related: Awaiting a decision · Close the day