The most serious IOLTA mistake is commingling client funds with firm operating money. This happens when retainers get deposited into the wrong account, when earned fees sit in trust too long, or when firm expenses accidentally get paid from the trust account. Even brief commingling is a violation. The California State Bar does not care that it was accidental or that you fixed it quickly.

Negative client balances are equally problematic. When you disburse more than a specific client has in trust, you’ve effectively used other clients’ funds to cover the shortage. This typically happens when firms check the overall trust account balance instead of verifying the individual client ledger before writing a check. A trust account with $50,000 total might still have clients with zero or near-zero balances.

Many firms fail at three-way reconciliation. Your bank statement, client ledgers, and book balance should all match every month. Some firms reconcile the bank statement to their total but skip verifying that individual client ledgers add up correctly. That shortcut is how negative balances and allocation errors go unnoticed until an audit surfaces them months or years later.

Poor documentation makes everything worse. Every deposit should clearly identify which client the funds belong to. Every disbursement should note the purpose and matter number. When the State Bar audits your records, they want to trace every dollar to a specific client and a specific purpose. Incomplete records make legitimate transactions look suspicious.

Law firm trust accounting requires written procedures that staff can follow consistently. Too many firms rely on institutional knowledge held by one person. When that person gets busy, goes on vacation, or leaves the firm, compliance slips because nobody else knows exactly what to do.

Timing errors also trigger violations. Client funds should be deposited within a day of receipt. Earned fees should move to operating as soon as the work is billed and the fee is earned, not whenever someone remembers to transfer them. Holding earned fees in trust creates the same commingling problem as mixing accounts.

The State Bar does not audit every firm, but when they do, they review years of records. Many San Gabriel Valley QuickBooks bookkeepers work with law firms to set up proper reconciliation systems and catch issues before they become compliance problems. Monthly reconciliation costs a fraction of what cleanup and disciplinary defense cost after an audit finds violations.