What Is Commingling, and What Happens If a Law Firm Does It?

Commingling is mixing client money with the firm’s own money. It’s a rule violation in every US jurisdiction, and the violation is the mixing itself, not the loss. No client has to be harmed, no dollar has to go missing, and no one has to intend anything. If firm funds and client funds occupy the same account, or the same ledger line, that’s the finding.

Most commingling starts as a bookkeeping setup that made sense to whoever built it, long before anyone thought about client funds.

What actually counts as commingling?

Four situations, and only the first one is obvious:

Firm money sitting in the trust account. An earned fee that was never transferred out. A deposit that went to the wrong account and stayed there. Firm funds left in trust to cover bank fees.

Client money sitting in the operating account. A retainer deposited to operating “just until we get the trust account set up.” An advance for filing fees that a client paid by card and the processor routed to the firm’s operating account.

Client funds pooled with no per-client detail. The bank account is separate, so the account structure looks right. But if the books carry one “Client Funds” balance with no individual client ledger underneath it, you can’t demonstrate whose money is whose. Several state bars treat the inability to produce individual client ledgers as commingling in substance.

One client’s funds covering another client’s disbursement. Usually visible as a negative balance on a single client ledger while the account total looks healthy. This is the one that ends careers, and it’s almost always an accident that compounded.

Why does intent not matter?

Because the rule protects the client’s property interest, not the firm’s honesty. Client funds in trust don’t belong to the firm, so the firm’s obligation is custodial: keep them separate, keep them identifiable, and be able to prove both on demand.

That framing explains a result that surprises people. A firm that leaves $200 of earned fees in trust for four months has commingled. A firm that immediately reimburses a shortage from partner funds has still commingled, and in most jurisdictions has also created a second reportable event by depositing firm money into trust. Fixing it correctly matters more than fixing it fast.

The consequences scale with the pattern, not the amount. A single stale transfer, self-corrected and documented, is a housekeeping problem. A structural setup that mixes funds every month is what produces suspension. Our state bar IOLTA audit preparation guide walks through how examiners distinguish the two.

Which QuickBooks setups cause accidental commingling?

Four configurations account for most of it:

The trust bank account mapped to an income account. Trust deposits then post as revenue. The firm’s books show money it doesn’t own as money it earned, and the trust liability never exists.

A single “Client Funds” account with no sub-ledger. The balance is right in aggregate and unprovable per client. Individual client ledgers are the artifact a bar examiner asks for, and an aggregate balance can’t produce them. Our guide to setting up individual client trust liabilities on the balance sheet covers the structure that does.

Undeposited Funds holding client and firm receipts together. Payments sit in one staging account before deposit, and a trust payment and an operating payment can end up in the same batch deposit.

Card payments landing in the wrong account by default. A processor configured with one deposit destination will route a trust payment to operating, every time, silently.

None of these require anyone to do anything wrong. They’re all the result of a chart of accounts built for a business that doesn’t hold other people’s money.

How do you know whether you have a problem right now?

Three checks, in this order:

1. Pull every individual client ledger and look for a negative balance. Any negative balance means one client’s funds covered another’s disbursement. That’s the urgent one.
2. Compare the sum of client ledgers to the trust account book balance. A gap in the firm’s favor usually means earned fees never left. A gap the other way usually means firm money went in.
3. Check whether either number ties to the bank statement. All three agreeing on the same date is a three-way reconciliation, and it’s the proof the bar asks for. Our walkthrough of the three-way reconciliation process covers the mechanics.

Say the hard part plainly: three-way reconciliation runs in QuickBooks Online, not in LeanLaw. What LeanLaw does is make sure trust activity arrives in QBO already attributed to a client and a matter, so the individual client ledgers exist as a byproduct of the work rather than as a monthly reconstruction project. Commingling in substance is often an attribution failure before it’s an account-structure failure.

Frequently asked questions

What is commingling of client funds? Mixing client money with the firm’s own money, either in the same bank account or in books that can’t identify whose money is whose. It’s prohibited in every US jurisdiction.

Is commingling the same as misappropriation? No. Commingling is mixing the funds. Misappropriation is using client funds for something other than the client’s purpose. Commingling frequently precedes and enables misappropriation, which is why bars treat it as serious on its own.

Can you commingle without losing any money? Yes, and it’s the most common form. The violation is the failure to keep funds separate and identifiable, not a shortfall.

Can I leave a small amount of firm money in trust to cover bank fees? Some jurisdictions permit a small firm-funded balance for bank charges, and others prohibit it outright. This is a rule you have to read rather than assume. Check your state bar’s trust account rule before leaving anything in.

What should I do if I find commingled funds? Stop, document what you found and when, correct it in the way your jurisdiction’s rule prescribes, and check whether the rule requires self-reporting. Correcting quietly and incorrectly creates a second problem on top of the first.