The trust accounting handbook is a practical guide created to assist attorneys to comply with recordkeeping standards for client trust accounts. The handbook is currently only available online.Under Rule 1.15, California attorneys are required to maintain sufficient records to track how much money is held for each client at all times. Trust Fund Resources. In this guide, we will explore the importance of client trust accounts and provide an overview of how you should set up and maintain them. While not required, the simplest and safest thing to do is to hold advance fees in your client trust bank account and draw them out as you earn them.