Attorney Retainer: What It Is, What Goes in Trust, and How to Set One

An attorney retainer is one of the first financial decisions a new firm makes, and the one most often made on the strength of a word rather than a rule. In the fee rules that states actually adopt, “retainer” is a narrow, defined term, and the thing most firms collect and call a retainer is something else entirely. The difference decides whose money it is, which bank account it sits in, and whether you have to give it back.

What an attorney retainer actually is

An attorney retainer is money a client pays your firm before the work is finished. That is the whole of the plain-English definition, and it is also where the trouble starts, because the single word covers at least three arrangements that the conduct rules treat very differently. The Legal Information Institute at Cornell Law School separates them cleanly: a general retainer, where “a lawyer agrees to handle a case or future issues that arise for a client” and the payment compensates only for reserving that availability; a security retainer, where “the client makes a payment for future services, but the money does not go to the lawyer until they earn the compensation”; and an advance payment retainer, a prepayment where, in some states, “payments can go to the lawyer, not necessarily to a trust or special account.”

Almost every page that ranks for this question stops at that taxonomy and then quotes a dollar range. For a client trying to work out what a lawyer will cost, that is enough. For the owner of the firm collecting the money, it is not, because the taxonomy is descriptive and the rule is operative. What you need to know is which of the three your own fee agreement actually creates, and the answer does not come from what you call it in the engagement letter. It comes from what the agreement says the money is for and whether the client signed it.

The rules that decide this are state rules, not national ones. The American Bar Association’s model text is influential but adopted nowhere as written, so throughout this piece the operative language quoted is Washington’s, which is a clearly drafted adoption and one of the few that defines a retainer in the black letter rather than leaving it to comment. Your own state’s version will differ in detail. The structure of the question will not.

The word names three different instruments

Here is the same taxonomy restated as the four things an owner actually needs to know about a payment sitting in the firm’s hands: whose property it is, which account it belongs in, what has to happen before it becomes revenue, and whether any of it goes back if the matter ends early. Washington’s rule names each arrangement expressly, and the labels it uses are the ones this article uses from here on.

Read the middle row again, because it is the one that surprises people. A true retainer under RPC 1.5(f)(1) is “a fee that a client pays to a lawyer to be available to the client during a specified period or on a specified matter, in addition to and apart from any compensation for legal services performed.” The italics are the whole rule. If the payment will be drawn down as you do the work, it is not a retainer. It is an advance fee deposit wearing a retainer’s name, and it belongs in trust.

Washington’s Comment 13 says this in terms, and it is worth quoting because it disposes of the most common drafting error in small-firm engagement letters: “a payment purportedly made to secure a lawyer’s availability, but that will be applied to the client’s account as the lawyer renders services, is not a retainer under paragraph (f)(1).” The comment also lists the synonyms the profession uses for the real thing, which is useful when you are reading someone else’s form: availability retainer, engagement retainer, true retainer, general retainer, classic retainer. All five name the same narrow instrument.

Which account the money goes in, in two questions

Every payment that arrives before the work is finished resolves into one of those three buckets, and the path is short. The default is trust. Washington’s Comment 12 states the presumption without qualification: “In the absence of a written agreement between the lawyer and the client to the contrary that complies with paragraph (f)(1) or (f)(2), all advance payments are presumed to be deposits against future services or costs and must, until the fee is earned or the cost incurred, be held in a trust account pursuant to Rule 1.15A.”

That presumption is the reason the two questions below run in the order they do. You do not start by deciding what to call the fee. You start in trust and work out whether you have the signed writing that gets you out of it.

Where an advance payment belongs, in two questions

One wrinkle worth knowing before you draft anything. If a single payment mixes the two, say a flat fee for the defined piece of work plus a deposit against hourly work beyond it, Washington’s Comment 16 says the exceptions apply only to the parts of the arrangement that qualify. And if it all arrives as one check, the check must be deposited intact into the trust account and the portion belonging to the firm withdrawn “at the earliest reasonable time.” You cannot split a single instrument across two accounts. The mechanics of moving money between those accounts, and of proving each month that you did it correctly, are covered in our guide to lawyer trust accounting.

The true retainer, and why it is so rare

A retainer in the rule’s narrow sense is a payment for standing by. The client is buying a claim on your availability over a stated period or for a stated matter, and the rule is explicit that this sits “in addition to and apart from any compensation for legal services performed.” You will still bill for the work. The retainer buys the readiness to do it.

Washington makes that money the lawyer’s property on receipt unless the parties agree otherwise, and it goes further than permitting the operating account: it directs that the payment “shall not be placed in the lawyer’s trust account.” Comment 15 explains why, and the reason is the same principle that governs everything else in the safekeeping rule. Once the fee is yours, keeping it in an account that holds client funds is commingling, which RPC 1.15A(c) prohibits from the other direction. The exception does not give you a choice of accounts. It moves the money out of trust and keeps it out.

Three things have to be true before you can rely on it. The agreement must be in a writing the client has signed, not merely confirmed by email. The writing should “clearly specify the time period or purpose of the lawyer’s availability, that the client will be separately charged for any services provided, and that the lawyer will treat the payment as the lawyer’s property immediately on receipt and will not deposit the fee into a trust account.” And the arrangement has to be real. If, in practice, the balance gets applied against your invoices, the label fails and the money was always an advance fee deposit.

That last condition is why the instrument is rare in solo and small-firm practice. A general counsel arrangement for a business client who wants first call on your time genuinely fits. So does an agreement to stay conflict-free in a matter you expect to be adverse to someone. Most residential, family, criminal and estate work does not, because the client is not buying your availability. They are buying a specific piece of work, and every dollar they hand over is intended to pay for it.

The flat fee exception, and the five lines it requires

The second exception is the one far more small firms can actually use, and it is now the common case rather than the exotic one. Clio’s 2025 Legal Trends Report, as reported by the Illinois Supreme Court Commission on Professionalism, found 59 percent of firms using flat fees exclusively or alongside hourly rates in 2024. On the client side, the 2024 edition of the same report found 71 percent saying they prefer to pay a flat fee for their entire case. Whatever else is true about how the profession bills, a majority of firms now touch this rule.

A flat fee under RPC 1.5(f)(2) is “complete payment for specified legal services” that “does not vary with the amount of time or effort expended.” Agreed in advance in a writing signed by the client, it becomes the firm’s property on receipt and must not be deposited into trust. Miss the writing and the money is an advance fee deposit that belongs in trust and comes out only as milestones are met. The rule does not leave the required contents to inference. It lists five terms and then supplies a model paragraph that satisfies them.

The rule requires all of this “in a manner that can easily be understood by the client,” which is a drafting instruction as much as a disclosure one. Its own model paragraph is four sentences of ordinary English with blanks for the fee, the services and the payment schedule, and it ends by telling the client, in the rule’s words, that “in the event our relationship is terminated before the agreed-upon legal services have been completed, you may or may not have a right to a refund of a portion of the fee.” If your engagement letter says less than that, the exception is not available to you and the money belongs in trust, whatever the letterhead calls it.

Two practical notes. First, the fifth line is not a formality; it is the rule conceding that a flat fee can still be partly unearned, which is the point Formal Opinion 505 makes at length. Second, if you take the fee by card, Washington’s Comment 8 to RPC 1.15A is specific about routing: an advance fee deposit paid by card must go directly into the trust account and cannot be run through a general account first, while a qualifying flat fee or retainer cannot be deposited into the trust account and then transferred out. The payment rails have to match the bucket.

Why “nonrefundable” does not do what firms think it does

The phrase survives in engagement letters because it sounds like protection. It is not. ABA Formal Opinion 505, issued May 3, 2023, addressed the practice directly and, as reported by the ABA Journal, held that the Model Rules “do not allow a lawyer to sidestep the ethical obligation to safeguard client funds with an act of legerdemain: characterizing an advance as ‘nonrefundable’ and/or ‘earned upon receipt.'” The opinion’s reasoning is structural rather than semantic. When a client pays an advance, the lawyer takes possession of the funds but not ownership of them, and possession does not ripen into ownership until the work is done.

The opinion also closes the workaround of calling a flat fee a general retainer. Those are different instruments, and a fixed price is still a price for work. A fee contingent on the outcome is a third instrument again, governed by its own paragraph of the rule, and our guide to contingency fee agreements sets out what that writing has to contain. If the representation ends before the described services are complete, the unearned portion goes back. That is not a policy the opinion invents; it follows from the termination rule. Washington’s RPC 1.16(d) requires a lawyer whose representation ends to take reasonably practicable steps to protect the client’s interests, “such as giving reasonable notice to the client, allowing time for employment of another legal practitioner, surrendering papers and property to which the client is entitled and refunding any advance payment of fee or expense that has not been earned or incurred.” Comment 4 to RPC 1.5 states the same duty from the fee side: a lawyer “may require advance payment of a fee, but is obliged to return any unearned portion.”

There is a narrow, legitimate version of what the word is reaching for. A true retainer under (f)(1) really is earned on receipt, because what it paid for, your availability during the stated period, was delivered by your standing ready. That is a different sentence from “the client cannot get any of this back no matter what,” and it only holds if the arrangement is the real thing. A handful of jurisdictions allow more latitude with informed client consent, which is another reason to read your own state’s adopted text rather than a national summary of it.

How to size a retainer, which almost nobody writes down

Ask the internet how much an attorney retainer should be and you get dollar ranges: a few thousand for a simple matter, five figures for litigation, more for a bet-the-company case. Those numbers describe what other firms happened to collect. They are not a method, and a number you cannot defend is a number you will discount the moment a client pushes on it. The reasonableness factors in RPC 1.5(a) include “the time and labor required” and “the fee customarily charged in the locality for similar legal services,” so the defensible figure is one you derived rather than one you borrowed.

A method that survives a client conversation has four steps. Estimate the hours to the next natural milestone in the matter rather than to its end, because the end is the part you cannot forecast. Multiply by the rate in your fee agreement. Add the hard costs you expect to advance inside that same window, filing fees, service, records. Then set a replenishment floor, the balance at which the client tops the account back up, at roughly a third of the opening figure, so the trigger fires while there is still work funded rather than after you have run dry.

The rate in that illustration is a placeholder, not a benchmark. For what firms comparable to yours actually charge, and for the reasonableness factors that bear on it, see our piece on lawyer hourly rates, and how those hours become an invoice is covered in our piece on attorney billing. What matters here is the shape of the calculation, because it is the shape that the replenishment clause then protects. An evergreen, or replenishing, clause commits the client to restore the trust balance to the opening figure whenever it drops below the floor. Written into the fee agreement at the start, it is a term. Asked for halfway through a contested matter, it is a negotiation.

Two details in that worksheet do most of the work. Estimating to the next milestone rather than to the end of the matter is what makes the number credible, because a milestone is something both of you can picture and argue about, while the end of a contested matter is a guess dressed as a figure. And putting the floor at roughly a third of the opening deposit, rather than at zero, buys the client time to pay the top-up without the work stopping. A floor set at zero is not a floor. It is a notification that you have already run out.

The chart below runs the same matter twice over six billing cycles: once with the floor and the top-up in the agreement, and once without. The line that matters is the lower one. From the third cycle onward, the firm without a replenishment clause is performing work it has not been paid for and may not be paid for, which is a loan from the firm to the client made without anyone deciding to make it.

The same matter, with and without a replenishment floor

What the retainer is really buying: ninety-seven days

Strip away the compliance layer and a retainer is a working-capital instrument. It decides whether your firm is paid before, during or after the work, and the honest answer for most firms is after. Clio’s 2024 Legal Trends Report, as reported by Attorney at Work in October 2024, tracks this as lockup, the number of days a firm’s revenue spends unbilled or uncollected across the year. The report follows three measures, and in 2024 the average realization lockup was 46 days, the average collection lockup was 28 days, and the total number of lockup days was 97.

Ninety-seven days is a quarter of the year. It is the gap between doing work and holding the cash from it, and it is the gap a firm without reserves has to bridge out of its own pocket, or out of a line of credit, or by not paying itself. AffiniPay’s 2025 Legal Industry Report, a survey of more than 2,800 legal professionals working mostly in solo and small firms reported by LawSites in March 2025, found 68 percent describing fee collection as a significant or moderate challenge, and 82 percent of firms now accepting card payments, up from 78 percent in 2023. The payment rails have modernized considerably faster than the gap has closed.

Days a firm’s revenue sits unbilled or uncollected

It is worth being precise about what those three measures are, because they are easy to run together. Realization lockup counts the days between doing work and billing it. Collection lockup counts the days between sending the invoice and being paid. Total lockup is the report’s own headline measure of how long revenue sits in either state across the year, and the report tracks it separately rather than as the sum of the other two. For a firm owner the useful reading is not the individual number but the direction it points: the money leaves your control at the moment you do the work and does not come back for months.

Lockup is the downstream symptom. The upstream numbers from the same report explain where it comes from: a utilization rate of 37 percent, meaning about 2.9 hours of an eight-hour day spent on billable work, a realization rate of 88 percent of that time actually making it onto an invoice, and a collection rate of 91 percent of invoiced work actually being paid. Each of those is an improvement on 2019, and each still leaves a gap. That cascade, and what to do about the two rates a retainer cannot touch, is the subject of the law firm profitability guide. An advance fee deposit with a replenishment floor does not fix utilization or realization. What it does is move collection to the front of the sequence, so that the 97 days apply to work you have already been funded for rather than work you are hoping to be paid for.

Where the working day leaks before it becomes cash

What to do when the matter ends

The close-out is where retainer problems become complaints, because it is the moment the client finds out what happened to money they handed over months earlier. Three duties converge, and none of them is onerous if the ledger was kept along the way.

First, account. RPC 1.15A(e) requires a lawyer to “promptly provide a written accounting to a client or third person after distribution of property or upon request,” and to provide one at least annually for anyone whose funds you are still holding. A final statement showing the opening balance, each withdrawal against an invoice, and the closing balance is not a courtesy. It is the rule.

Second, refund. Any advance payment of fee or expense that has not been earned or incurred goes back under RPC 1.16(d), whether the representation ended because the matter concluded, because the client discharged you, or because you withdrew. The rule makes no distinction among those, and neither does the arithmetic.

Third, if the client disputes the number, do not simply take the money. RPC 1.15A(g) is explicit: where two or more people claim an interest in property you hold, “the lawyer must maintain the property in trust until the dispute is resolved,” while promptly distributing every undisputed portion and taking reasonable action to resolve the rest, “including, when appropriate, interpleading the disputed funds.” The undisputed part moves. The contested part stays in trust. Moving a disputed fee into your operating account while you argue about it converts a fee disagreement into a safekeeping violation, and the second one is much harder to answer. Where the fee at issue is a retainer or flat fee under RPC 1.5(f), paragraph (f)(3) adds a parallel duty to “take reasonable and prompt action to resolve the dispute.”

Where fee problems show up in the discipline record

Fee and trust questions are not a niche compliance concern. They sit near the top of what clients actually complain about. The Florida Bar publishes an annual breakdown of its most common complaint categories, and in the 2024 figures reported by its own news service in February 2025, trust accounting issues ranked third and excessive fees ranked sixth out of the ten most frequent categories. Across the same year the Bar opened 3,659 files, filed 235 discipline cases with the state Supreme Court, and saw 18 lawyers disbarred.

Two of those three numbers are worth holding next to each other. Roughly 3,659 files opened against a membership of 112,473 lawyers is a small fraction of the bar in any given year, and the overwhelming majority of those files never become a case before the court. The point of the ranking is not that fee problems are common in absolute terms. It is that among the things clients do complain about, money held on their behalf and money charged to them sit high on the list, above categories that lawyers worry about far more, such as conflicts and competence. A complaint is not a finding. The ranking counts what was complained about rather than what was proved, so it measures what clients notice rather than what lawyers were held to have done. That is still the number a firm owner should care about, because perception is what generates the file.

The Florida Bar’s ten most common complaint categories, 2024

One state’s complaint mix is not a national statistic, and a complaint is not a finding. What the ranking does show is that the two failure modes this article has been circling, mishandling money held for a client and charging a fee that cannot be justified, are among the things clients notice and report. Both are avoidable with paperwork written before the first dollar arrives.

Building the retainer into your firm’s system

A retainer policy is three documents and one habit. The documents are a fee agreement that names the instrument correctly and carries the signatures the rule requires, a client ledger for every matter that holds funds, and a final accounting template you can produce in minutes rather than reconstruct from invoices. The habit is the monthly reconciliation that proves the ledger and the bank agree.

Three documents is a deliberately small number. Most of the failures described in this article are not failures of judgment under pressure; they are the consequence of an engagement letter drafted once, years ago, from a form whose provenance nobody remembers, and then reused on every matter since. Reading your own form against the rule takes an afternoon. It is the single highest-yield afternoon in a small firm’s compliance year, because every matter that follows inherits whatever it says.

The reconciliation is the one people skip, and it is the one that catches everything else. If the sum of the client ledgers does not match the trust account balance, something in the chain above has already gone wrong, and the sooner you see it the smaller it is.

None of that lives in isolation. The account mechanics and the recordkeeping rule behind them are covered in lawyer trust accounting, the pooled interest account most of these deposits will sit in is explained in what an IOLTA account is, the rate that a deposit is drawn down against is the subject of lawyer hourly rates, and the way fee design feeds margin sits in the law firm profitability guide. If you are still setting the firm up, the two-account structure is one of the first steps in how to start a law firm.

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