Set a calendar and publish it
Clients cannot meet deadlines they do not know. Publish a close calendar: statements and documents by working day 3, AI matching and bookkeeper review by day 7, senior review by day 10, reports out by day 12. Put it in the engagement letter and remind clients on day 1.
For VAT quarter months, bring dates forward for clients with quarter ends so the VAT 201 figures are reviewed with time to spare before the 28-day filing deadline.