Bookkeeping practices carry a particular rhythm: quiet early in the month, frantic at the end. Much of that is because categorisation waits for the books to be 'ready', when the data has been sitting in the bank feed for weeks. The bookkeeping agent works through the feed daily and learns each client's rules, which spreads the effort across the month. Your bookkeepers spend their time on flagged items, missing receipts and the judgement calls that need a person.
The practice also gets a clearer view of its own work. When flagged items are counted each month, you can see which clients create the most review effort and why. Sometimes the cause is a missing receipt habit, and sometimes it is an unusual supplier. Either way, you can talk to the client about it with evidence.
More clients per bookkeeper only works if quality holds, so growth should be staged. A staged approach protects quality and keeps the team confident, because each step is checked before the next one begins. Start small, then widen the group.
Practices whose clients mostly run on cash and paper will see less benefit until receipts are digital. Clients with years of unreconciled history need a clean-up first, led by your accountants. Track flagged items per client, review time and repeat corrections. Those show whether capacity is genuinely growing.