Pay From Trust: How Law Firms Apply Retainer Funds to an Invoice

On the first business day of the month, the invoice goes out: a client with a retainer in trust, a month of work, a balance due. The bookkeeper can see the money sitting there in the client’s trust ledger. The partner who did the work asks the obvious question at the coffee machine. Can we just pay from trust and move on?

Often, yes. The order matters, though, because the moment a retainer turns into revenue is also the moment a trust account is most exposed to a mistake. The money has to be earned. In some states, the client has to be told before or when it moves. Only the earned amount can leave, however much the client has on deposit.

What follows is the sequence, in the order it should happen, plus the three situations that complicate it: a balance that doesn’t cover the invoice, a client who disputes the bill, and a state with its own notice rule. Trust rules are set by each state, based on ABA Model Rule 1.15 to varying degrees, so treat this as general guidance and confirm the details for your jurisdiction.

What has to be true before you pay from trust?

Two conditions, and sometimes a third.

The fee has to be earned. Model Rule 1.15(c) requires advance fees to go into trust, “to be withdrawn by the lawyer only as fees are earned or expenses incurred.” An invoice for work performed is how most firms document that the fee is earned. A retainer for work that hasn’t happened yet stays where it is.

The amount has to match the agreement. Model Rule 1.5(b) expects the basis or rate of the fee to be communicated to the client, preferably in writing, before or within a reasonable time after the representation starts. The invoice you’re paying from trust should reflect that agreed basis, which is also what lets the firm defend the withdrawal later.

Your state may require notice. Some states spell out what the client must receive. Massachusetts Rule 1.15(d)(2) requires that, on or before the date of a withdrawal to pay the lawyer’s fees, the client receive in writing an itemized bill or other accounting of the services, notice of the amount and date of the withdrawal, and a statement of the client’s remaining trust balance. Washington’s RPC 1.15A(h)(3) says a lawyer “may withdraw earned fees only after giving reasonable notice to the client of the intent to do so, through a billing statement or other document.” Other states handle this differently, so check yours before you set a standard practice.

The pay-from-trust sequence, step by step

Here is the order that keeps the trust account, the operating account, and the client’s invoice in agreement.

1. Issue the invoice. It shows the work performed and the amount earned for the period.
2. Notify the client. The invoice often carries the notice: the amount to be applied from trust, the date, and the trust balance that will remain. If your state requires more, or requires a waiting period, build that in here.
3. Confirm the funds are earned. The invoice covers completed work, the amount follows the fee agreement, and any notice requirement has been met.
4. Transfer the earned amount only. Move exactly the invoiced amount (or the client’s available trust balance, if lower) from trust to operating. Never round up, and never take tomorrow’s work in advance.
5. Record it in both places. The client’s trust ledger shows the withdrawal and the new balance. The invoice shows a payment applied from trust. The operating account shows the deposit. All three should agree to the cent.

If the retainer was a flat fee, the earned-on-completion logic is the same but the trigger is different. Our guide to transferring an earned flat fee from IOLTA to operating covers that version, and the mechanics of how a trust-to-operating transfer works are worth reviewing if your team is new to it.

When the trust balance doesn’t cover the invoice

This is the common case on an active matter. The client deposited a retainer months ago, the work has outpaced it, and the invoice is larger than what’s left in trust.

Apply what’s there, and no more. A single client’s trust balance can only pay that client’s invoice, and only up to what that client has on deposit. Massachusetts states the principle directly in Rule 1.15(f)(1)(C): a lawyer “shall not disburse funds from the trust account that would create a negative balance with respect to any individual client.” Another client’s money in the same pooled account is never available to cover the gap.

The remainder becomes an ordinary balance due, and how you ask for it affects how quickly it comes in. A full-balance payment link (one link that lets the client pay everything outstanding) removes the friction of the client working out which invoices to pay. Pursuit Legal collected $13K in past-due invoices within one month of using LeanLaw’s full-balance link.

If your engagement agreement calls for the client to top up the retainer, the invoice is also the natural place to ask for it. Our post on evergreen retainer replenishment covers how firms set that up.

When the client disputes the bill

A disputed invoice changes what can move. Model Rule 1.15(e) says that when two or more persons (one of whom may be the lawyer) claim an interest in property, it “shall be kept separate by the lawyer until the dispute is resolved,” and the lawyer “shall promptly distribute all portions of the property as to which the interests are not in dispute.”

In practice, that means splitting the invoice. Transfer the undisputed portion; leave the disputed portion in trust, with a note on the client’s ledger explaining why. Don’t move it to operating “for safekeeping” while the conversation plays out. If the dispute surfaces after the money has already moved, the steps are different; see our guide on handling a fee dispute after a transfer from trust.

Where the records should end up

Pay from trust touches three records at once: the client’s trust ledger, the invoice, and the general ledger. When someone updates each one by hand, any of them can drift, and the mismatch usually surfaces at reconciliation.

LeanLaw handles this with pay from trust, which applies a client’s trust funds directly to an invoice, alongside per-client trust sub-ledgers and automated trust transfers. Because LeanLaw is built on QuickBooks Online (it’s a requirement), those transfers land in QuickBooks Online without re-entry, and reconciliation happens there too. See how LeanLaw handles trust accounting.

Why the managing partner should care

Every week a retainer matter’s invoice waits for someone to apply it, the firm has done the work, billed it, and still doesn’t have the cash. On retainer matters, a consistent pay-from-trust routine shortens days to collect, because the funds are already in the firm’s hands and only need to be moved correctly. And the remainder, when there is one, gets a direct path to payment, which supports the collection rate on matters that would otherwise drift into aging receivables.

The other side is risk. Once a fee is earned, it belongs to the firm, and some states say plainly that it shouldn’t linger in trust; Washington’s RPC 1.15A(h)(1) requires the lawyer’s portion of mixed funds to be withdrawn “at the earliest reasonable time.” Taking money out before it’s earned is the bigger risk. Either way, the name on the response to a bar inquiry belongs to a lawyer at the firm, and a record where every withdrawal traces to an earned, billed, noticed amount is what makes that response short.