Two numbers tell a practice whether collection is working: the share of clients whose records arrive by the cut-off, and the number of bank lines still unexplained when the period closes. Tracked month by month, they show which clients need a different approach and whether a change in process actually helped.
Track, for each client and period, the date information was complete and the number of questions raised. Within two VAT windows you will know which clients need a different arrangement and whether changes such as digital capture are working. The numbers also support a conversation about fees.