Client trust funds must be held in a completely separate bank account from your operating account. This isn’t optional. In California, the State Bar requires it. Client retainers, settlement proceeds, and any other funds you hold on behalf of clients go into an IOLTA or client trust account. Your operating expenses, payroll, and firm revenue stay in your operating account. Two accounts, two purposes, never mixed.

In your accounting software, you’ll set up both bank accounts separately. The trust account should never affect your profit and loss statement because trust money isn’t your money. It’s a liability you owe to clients. When someone gives you a $10,000 retainer, you’re holding $10,000 that belongs to them until you earn it. Your books should reflect that as a deposit in the trust bank account and a corresponding liability owed to that specific client.

The danger of commingling is severe. Using client funds for firm expenses, even temporarily, is one of the fastest ways to face State Bar discipline. Even accidental commingling triggers problems. The separation has to be absolute, which is why getting the setup right from the start matters so much.

For each client, you need to track their individual balance within the trust account. Practice management software like Clio integrates with QuickBooks to maintain client ledgers showing every deposit and disbursement for each matter. The sum of all individual client balances must equal your total trust account balance. This three-way reconciliation between your bank statement, your book balance, and your client ledgers should happen monthly without exception.

When you earn fees, you transfer money from trust to operating. When you receive a retainer, it goes into trust. When you pay costs on behalf of a client, those disbursements come from trust. Every dollar in the trust account has an owner, and you should be able to identify exactly how much belongs to each client at any moment.

Common mistakes include depositing firm revenue into trust by accident, paying operating expenses from the trust account, and failing to transfer earned fees promptly. All of these create compliance problems and make your records difficult to reconcile. An LA County bookkeeper for small business who understands legal accounting can help you avoid these pitfalls and maintain proper separation.

Many attorneys handle their own general bookkeeping but struggle with trust accounting because the requirements are specific and the consequences of errors are real. Law firm trust accounting requires monthly three-way reconciliations, detailed client ledgers, and integration between your practice management and accounting software. Getting professional help with this area often makes sense even if you handle other bookkeeping tasks yourself.