The practice calendar, honestly observed
Every deadline season repeats the same script. Staff phone clients for bank statements and purchase registers that should have arrived a month ago. Filing happens at midnight. New enquiries that arrived during the crunch are called back after the deadline, by which time they found another firm. Proposals sent in the quiet weeks were never chased. And engagements renew on autopilot until the year a client mentions a cheaper quote.
An accounting practice runs on a public calendar everyone can see, which makes it the easiest industry in this list to automate well: the triggers are literally published by the government.