Trust Accounting and IOLTA: A Compliance Guide for Small Law Firms

Trust accounting is the part of running a firm where a paperwork mistake and an ethics violation look identical. The rules are not complicated, but they are unforgiving, and they are one of the most common reasons good lawyers end up in front of a disciplinary board.

What is a client trust account, and what is IOLTA?

A client trust account is a dedicated bank account where a lawyer holds money that belongs to someone else: unearned fees, settlement proceeds, filing-fee advances, or funds held for a third party. It is kept entirely separate from the firm’s operating account, and the core idea is simple. The money in it is not yours. You are a custodian of it until the moment you have properly earned it or are required to pay it out.

IOLTA, which stands for Interest on Lawyers’ Trust Accounts, is a specific type of pooled trust account. When client funds are small in amount or held for a short time, it is not practical to open a separate interest-bearing account for each client, because the bank fees would eat any interest earned. IOLTA solves that by pooling those balances into one account whose interest is directed to fund civil legal aid. Participation rules differ from state to state, so whether IOLTA is mandatory, and exactly how you enroll, is something to confirm with your own state bar or IOLTA program.

What Rule 1.15 actually requires of you

Model Rule 1.15, “Safekeeping Property,” is the source of nearly every trust-accounting obligation, and it comes down to a short list of duties. You must keep client property separate from your own, keep complete records of it, notify clients and deliver their funds promptly, and keep any disputed money set aside until the dispute is resolved. Most states have adopted a version of this rule, sometimes renumbered, so read your own state’s text.

In practice, the rule requires the following of a firm owner:

• Separate the funds. Client money lives in the trust account, never in your operating account, and your money never lives in the trust account (with one narrow exception for the bank’s own service charges).
• Do not spend unearned fees. Advance fees stay in trust and move to operating only as you earn them.
• Keep the records. A ledger for each client showing every deposit and disbursement, retained for years after the matter closes.
• Deliver promptly. When a client or third party is entitled to funds, notify them and pay them without delay, and account for the funds on request.
• Never borrow. The trust account is not a line of credit. Using it to cover payroll or a cash-flow gap, even briefly and even if you intend to repay it, is misappropriation.

The mistakes that get lawyers disciplined

The violations that draw discipline are rarely exotic. They are ordinary bookkeeping failures that compound. In 2025 the State Bar of California ran a client-trust-account compliance review of a sample of firms, and the results are a useful map of exactly where firms go wrong. Most of the firms reviewed had noncompliant records of one kind or another.

Behind those percentages are a handful of recurring mistakes. Paying an operating or personal expense directly out of the trust account. Leaving earned fees sitting in trust, or sweeping them into operating too early, both of which are forms of commingling. “Borrowing” from the account to make payroll. Failing to keep a separate ledger for each client. And skipping the monthly reconciliation, which is what lets every one of the others go unnoticed until a bank overdraft notice lands on the disciplinary authority’s desk. Most state bars require banks to report trust-account overdrafts directly to the bar, so the account tends to announce its own problems.

Trust accounting is a top source of complaints

This is not a rare or theoretical risk. Trust-accounting problems consistently rank among the most common complaints against lawyers, and the money involved is real. The Florida Bar’s 2024 figures make the point plainly.

Florida is one state in one year, but the pattern holds broadly. A client-security or client-protection fund exists precisely because trust-account failures happen often enough to require a safety net for the clients who lose money. For a firm owner, the lesson is not to be afraid of the trust account. It is to treat it as a system with a routine, rather than as an afterthought you tidy up at tax time.

The one habit that keeps you compliant: three-way reconciliation

If you do only one thing well, make it the monthly three-way reconciliation. It is the check that catches errors before they become violations, and it is exactly the control most disciplined firms were missing. The idea is that three separate numbers must agree, every month, to the penny.

The three numbers are the bank statement balance, your own adjusted book balance for the account, and the total of every individual client’s ledger balance added together. When all three match, the account is in order. When they do not, something is wrong, a fee taken too early, a disbursement to the wrong ledger, a deposit missed, and you have found it before it grew. Doing this on a fixed day each month turns trust accounting from a source of anxiety into a fifteen-minute routine.

Building the trust-accounting system into your firm

Trust accounting is not really an accounting topic. It is an operations topic, and it belongs to the same part of running a firm as your fee agreements and your billing. The firms that stay clean are the ones that set up the account correctly, keep a per-client ledger from day one, reconcile on a schedule, and never treat the balance as available cash.

It connects directly to how you take money in. The way you structure a retainer determines what lands in trust in the first place, which is covered in our guide to how attorney retainers work. If you want to see where this fits in the larger picture of running a firm as a set of connected systems, the Spine program teaches finance and operations as two of its seven systems, and you can score your own firm across all of them in about five minutes.

Frequently asked questions