Law Firm Bookkeeping: Trust Accounting Basics

A solo attorney in the Heights called me after her bank flagged an overdraft on her trust account. It was $40 short for two days. No client lost a dime, and the money was replaced immediately. She still spent the next three months worried about a bar inquiry, because an overdraft on a trust account is the kind of thing that gets noticed.

Her books were the problem. She had one QuickBooks file, client retainers and firm fees flowing through the same accounts, and no real system for tracking whose money was whose. The overdraft was not theft. It was sloppy bookkeeping, and in a law firm, sloppy bookkeeping and a compliance problem are the same thing.

Law firm bookkeeping runs on rules that most small businesses never touch. This is what makes it different and how to keep the books clean.

The One Rule Everything Else Serves

Client money is not firm money. That is the whole foundation of law firm bookkeeping.

When a client pays a retainer, that money still belongs to the client until the firm earns it. Settlement funds passing through the firm belong to the client and other parties, not the firm. That money has to sit in a separate trust account, untouched, until the firm has actually earned it or is directed to release it.

Mixing the two, called commingling, is one of the fastest routes to bar discipline for an attorney. Everything else in law firm bookkeeping exists to prove, month after month, that the two pools of money never touched.

Operating Account vs. Trust Account

Every law firm runs on at least two bank accounts.

The operating account is the firm’s own money. Earned fees, rent, payroll, software subscriptions, and marketing all run through it. This account behaves like any other small business bookkeeping setup: income in, expenses out, categorized and reconciled.

The trust account holds client money the firm has not earned yet. In most cases this is an IOLTA (Interest on Lawyers’ Trust Accounts), a pooled account where interest goes to a state bar foundation rather than to the firm or the client. Retainers and settlement funds land here first.

Money moves from trust to operating only when the firm has earned it, and only after the client has been billed for the work. That transfer is a recorded event, not a casual withdrawal.

The Client Ledger: Whose Money Is Whose

A trust account is pooled, meaning one bank account can hold money for dozens of clients at once. The bank sees a single balance. The firm has to know, at any moment, exactly how much of that balance belongs to each individual client.

That is the job of the client ledger. Every client with trust money has their own running balance:

Client	Deposit	Earned/Paid Out	Trust Balance
Client A	$5,000	$2,000	$3,000
Client B	$3,000	$500	$2,500
Client C	$10,000	$10,000	$0

The sum of every client ledger balance must always equal the money actually sitting in the trust account. If one client’s balance ever goes negative, the firm has spent one client’s money on another client’s matter. That is a violation, even if the total account balance still looks fine.

Three-Way Reconciliation

This is the monthly ritual that keeps trust accounting honest, and it is where law firm bookkeeping earns its reputation for being demanding.

Three numbers have to match to the penny:

1. The trust bank statement balance (what the bank says is there)
2. The firm’s trust ledger balance (what the firm’s books say is there)
3. The total of all individual client ledgers added together (whose money it is)

Regular businesses reconcile two of these, the bank statement against the books. That process is covered in our guide on bank reconciliation. A law firm adds the third leg: the client-by-client total.

When all three agree, the trust account is clean. When they do not, something is wrong, a missing transaction, a misposted deposit, a fee pulled before it was earned, and it has to be found before the month closes. Finding a $40 discrepancy three weeks later is a headache. Finding it after a bar audit is a career problem.

Timekeeping and Billing Feed the Books

Most law firms bill by the hour or on contingency, which means the books depend on accurate time capture.

Billable hours are the firm’s raw material. If time is not tracked as work happens, it gets lost, and lost time is lost revenue. Trust accounting adds a wrinkle: the firm cannot move money from trust to operating until the client has been billed for that specific work. So the billing cycle and the trust transfer are linked. Bill the client, then move the earned fee out of trust.

Practice management platforms like Clio, PracticePanther, and MyCase handle timekeeping, billing, and trust ledgers in one place, and many sync with QuickBooks for the firm’s general accounting. The tools help, but they only work if the firm records time and reconciles consistently.

Where Law Firm Books Go Wrong

The problems we see most often are not exotic. They come from treating a law firm like a regular small business.

One account for everything. Running retainers and firm income through a single account is commingling by default. The two-account structure is not optional.

Pulling fees before they are earned. Moving a retainer into the operating account the day it arrives, before the work is done and billed, is spending client money. Fees come out of trust only as they are earned and billed.

Skipping the monthly three-way reconciliation. A firm that reconciles the bank statement but never totals the client ledgers can carry an error for months without knowing. The three-way check is what catches it early.

No individual client ledgers. Knowing the total trust balance is not enough. Without a per-client ledger, the firm cannot prove it never dipped into one client’s funds to cover another.

Doing it alone at year-end. Trust accounting is a monthly discipline, not a tax-season cleanup. A firm that ignores the books until April is a firm that finds its problems too late. If that sounds familiar, our guide on when to hire a bookkeeper covers the signs it is time.

Clean Books Are the Compliance Record

For most businesses, bookkeeping is about knowing whether you made money. For a law firm, it is that plus a running record that proves you handled client money correctly. The three-way reconciliation, the client ledgers, and the two-account structure are not busywork. They are the evidence a firm produces if the state bar ever asks.

The attorney stays responsible for compliance. But clean, reconciled books are what make that compliance provable, and what let an attorney sleep the night after a $40 overdraft instead of worrying for three months.

If your firm needs trust-aware bookkeeping services that keep the reconciliations current and the ledgers straight, our team works with Houston attorneys to keep the books audit-ready. Call us at (346) 389-5215 to talk through your setup.

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This article provides general information and is not legal, tax, or accounting advice. Trust accounting rules vary by state, and you should consult the applicable State Bar rules and a qualified professional about your firm’s specific circumstances.