Trust account discipline: keeping client money separate

Commingling trust funds with operating cash is not a bookkeeping error. It is a disciplinary offence, and it ends careers. Yet for a solo or small-partner firm juggling billable hours, retainer top-ups, and NET 60 corporate invoices, the line between "their money" and "your money" gets blurry fast.

Why the line blurs in small firms

Large firms have dedicated accounts payable staff. You have yourself, a paralegal if you're lucky, and a billing cycle that rarely lines up with when clients actually pay.

The typical failure pattern looks like this: a client pays a $10,000 retainer into your operating account because that's the account on your invoice. You draw from it as you bill. Three months later, you can't reconstruct exactly when earned funds moved or what's left of the advance. Your trust ledger and your bank statement tell different stories.

The root cause is almost always process, not intent. Retainer invoices go out on the wrong account. Earned fees don't get transferred on the day they're billed. Partial payments land in the wrong bucket. Fix the process, and the compliance follows.

The two movements that matter

Every dollar a client puts in trust makes exactly two legitimate trips:

1. In: Client pays an advance or deposit. It lands in the trust account. Not your operating account. Not your personal account.
2. Out: You bill against that advance. The earned amount transfers to your operating account on the date of the invoice, or the date work is complete, depending on your jurisdiction's rules.

That's it. No borrowing from trust to cover payroll while you wait on a slow corporate client. No leaving earned fees sitting in trust because reconciliation is a pain.

Setting up the invoice workflow to enforce separation

The invoice itself is your first line of defence. A retainer invoice should state clearly that funds are to be paid into your trust account, with the correct bank details for that account only. If your operating account wire details appear on a retainer invoice, you've already created the conditions for a mistake.

For earned-fee invoices, the reverse applies: those go to your operating account, with a line showing the trust draw if you're billing against an advance.

Reconciling the trust ledger without losing a day

Your trust ledger needs to reconcile to your trust bank statement at least monthly, and in many jurisdictions, more often. Each client should have their own sub-ledger so you can show at any moment exactly how much of the trust balance belongs to each matter.

The practical habit is simple: every time you send a fee invoice that draws against a retainer, record the transfer the same day. Do not batch it. Do not wait until month-end. One missed transfer entry, compounded over a quarter, is the thing that makes a routine audit uncomfortable.

What to do when the retainer runs low

When a client's trust balance drops below your agreed working threshold, send a retainer replenishment invoice immediately. Not at the end of the month. Immediately. A small firm carrying a $20,000 corporate matter on a $2,000 trust balance is effectively financing the client's legal work, while also sitting on a compliance risk if that balance hits zero before the next bill.

Recurring invoices can help here too. If you have a long-running matter with predictable monthly activity, a scheduled retainer top-up invoice removes the cognitive overhead of remembering to ask.

The habits that protect your licence

Trust account discipline is less about accounting skill and more about decision hygiene. A few rules that hold up:

• Never use trust funds to cover a firm expense, even briefly, even when you're certain the client owes you the money.
• Always confirm the deposit account before sending any invoice to a client.
• Transfer earned fees on the invoice date, not when it's convenient.
• Reconcile monthly, client by client, not just account-level totals.
• Keep a paper trail for every transfer between trust and operating, even if it's just a note in your billing system.

The bar complaint you never want to write a response to is the one that starts with "funds were commingled." The invoicing habits you build now are what prevent that sentence from ever being written about your firm.