TL;DR: Law firm accounts receivable is fee revenue you have billed but not collected, and it ages badly. This guide covers the collection benchmarks that matter, the client balance rule we use with consumer practices (trust funds always exceed WIP plus AR), a collections cadence that preserves client relationships, evergreen retainers and payment plans, and the billing problems that masquerade as collection problems. Contingency firms get their own section.
Law firm accounts receivable is the money clients owe for work your firm has already delivered. Every dollar sitting in AR is an interest-free loan to a client, usually one you never decided to make. Clio's 2025 Legal Trends Report puts the average collection rate at 93 percent, which means the typical firm loses 7 cents of every invoiced dollar. On $2 million in annual billings, that works out to $140,000 that was earned, billed, and never collected.
Most firms treat receivables as a chasing problem and assign someone to send reminders. Across the law firms we support, the firms with clean AR solved it earlier: they decided who funds the work before the work started, and they read their aging report every week. Here is how the leak breaks down before we get to the fixes.
Rates from Clio's 2025 Legal Trends Report. Net yield is arithmetic on those two averages.
What Law Firm Accounts Receivable Actually Measures
AR is the billed half of a two-part leak. Realization measures how much recorded time survives review and reaches an invoice. Collection measures how much of the invoiced amount turns into cash. Mori Kabiri's Law Firm KPIs pairs the two as billing realization rate and collected realization rate, because a firm can bill aggressively and still starve if payments never land. Good law firm accounts receivable management is mostly decided before the invoice exists.
The time dimension matters as much as the percentage. Kabiri tracks total lockup, the number of days between doing the work and getting paid, split into days unbilled and days unpaid. Clio's 2025 data puts the median collection lockup at 32 days and median total lockup at 93 days. A firm can post a healthy collection rate and still run short of operating cash because the money arrives a quarter late.
Set targets, not impressions. Mark Powers and Shawn McNalis, in Cashflow & Profitability, set the bar for hourly firms at collecting 95 percent of what is billed, and they are blunt about aging: the longer you wait to collect, the less you get. Our guideline adds a second test: keep receivables older than 90 days under 10 percent of total AR. Kabiri lists AR over 90 days as a core financial KPI for the same reason; it is the earliest honest signal that revenue is quietly converting to bad debt.
The Client Balance Rule: Keep Trust Funds Ahead of WIP and AR
For firms serving individual clients (family law, criminal defense, immigration, and estate work) our guidance comes down to one rule: the client's funds held in trust must always exceed their unbilled WIP plus their open AR. The moment work in progress outruns the money on deposit, your firm starts extending unsecured credit. And unsecured credit to a legal client carries a problem that ordinary trade credit does not.
Once the legal work is complete, the client's incentive to pay collapses. The custody order is signed, the case is dismissed, or the closing is done, and your invoice now competes with every other bill in the client's life, minus the urgency. Collection pressure after the matter ends also strains the exact relationship that produces referrals. The strongest moment to secure payment is before the final hearing, not after it.
Running the rule takes three mechanics. First, the engagement letter authorizes the firm to apply trust funds to invoices as fees are earned and billed, and it defines a replenishment floor. Second, billing staff pull a weekly report comparing each client's trust balance against WIP plus AR, and any client below the floor gets a replenishment request that day. Third, the letter includes a pause-work provision so attorneys are not producing new WIP for a client who has stopped funding the matter.
Example: a client deposits a $5,000 retainer. Three weeks in, WIP is $3,200 and open AR is $1,100, leaving $700 of headroom before the next hearing consumes it. The replenishment request goes out that week, while the client still needs the firm, not after the hearing when the balance has flipped negative.
Trust mechanics still apply throughout. Client funds in trust remain the client's money until fees are earned and billed, and earned fees move to operating promptly; the rule manages credit exposure, it does not turn the trust account into working capital. We get pulled into bar audits every year, and our firms pass because the client ledgers reconcile. If replenishment discipline is new territory for your firm, our IOLTA trust accounting services page covers how the accounting side runs.
Aging Discipline for Law Firm Accounts Receivable
The AR aging report groups every open invoice by how long it has been outstanding, usually 0 to 30, 31 to 60, 61 to 90, and over 90 days. Each bucket calls for a different response, and the report only works if someone owns it. Powers and McNalis build it into a standing monthly financial routine, with aging summaries pulled at the start and end of the month and collection calls scheduled on the calendar rather than made when someone remembers.
For firms with an active collection problem, monthly is not enough. We have billing staff review aging weekly and bring the over-60 list to the firm's regular financial meeting, next to the client balance report from the previous section. One habit from Cashflow & Profitability worth adopting: when supervising attorneys review case status with their teams, the financial status of each matter is on the agenda too, so nobody sinks another 40 hours into a matter the client stopped funding in March.
Two numbers summarize the whole report. AR days (average AR divided by average daily billings) tells you how long the typical invoice waits; if your terms say 30 days and AR days reads 55, your terms are fiction. The over-90 share tells you how much of the book is decaying; when it passes 10 percent, collections stopped being an administrative task and became a management problem.
A Collections Cadence That Does Not Torch Client Relationships
Awkwardness is why attorneys avoid collections, and ad hoc collections is where the awkwardness lives. A written cadence removes the emotion: every invoice gets the same sequence, every client hears from the same roles at the same intervals, and nobody has to decide whether today is the day to press. The process applies the pressure so the attorney does not have to.
Two rules keep the cadence from burning relationships. Keep the attorney out of routine follow-up until day 60, because the person managing the legal relationship should not be the one sending the third reminder. And treat the day 30 contact as service rather than pressure; a meaningful share of aged AR is a confused or disputed invoice, not a client refusing to pay.
Evergreen Retainers and Payment Plans
An evergreen retainer is a client trust deposit that the client replenishes as the firm bills against it, so the balance never runs to zero mid-matter. It is the client balance rule expressed as a billing structure: the deposit funds the work, monthly invoices draw it down, and the engagement letter obligates the client to restore the balance to the floor. For hourly consumer work, it converts collections from an after-the-fact chase into a before-the-fact funding requirement.
Not every client can fund a large deposit, and pretending otherwise just moves the problem to intake. For family law, criminal defense, and immigration matters, structured payment plans with a card on file do the same job in installments: the fee is scheduled against milestones, payments run automatically, and a failed charge is a same-day signal rather than a 60-day surprise. Powers and McNalis note that flat-fee firms collecting upfront, or half upfront and half by the final meeting, have little or no collection problem; the structure did the collecting.
Whichever structure fits the practice, the sequencing is the point. Payment terms belong in the engagement letter, funding happens before or alongside the work, and replenishment requests go out while the client still needs the firm. Firms that only discuss money at the end of the matter have chosen, structurally, to be paid last.
When Law Firm Accounts Receivable Is Really a Billing Problem
Some AR problems are collection problems. Many are billing problems wearing a disguise, and the aging report's patterns tell them apart. Invoices that get disputed at day 30, short-paid, or met with surprise trace back to what happened before the invoice went out, not after.
The upstream culprits are consistent across the firms we see. Time entered from memory at month end produces vague descriptions that invite disputes. Invoices sent four to six weeks after the work reach a client whose sense of urgency has already faded. Scope changes that were never discussed show up as line items the client does not recognize. And invoices without an online payment option add friction at the exact moment you want none.
The fixes are billing hygiene, not collections muscle. Enter time daily, bill at least monthly (weekly or biweekly for consumer matters), flag scope changes when they happen, and put a payment link on every invoice. Realization losses hide in the same upstream habits, and we covered that half of the leak in our guide to fixing realization rate upstream. If nobody owns the billing function, fix that ownership gap before touching the collections cadence.
The Contingency Exception: When AR Barely Exists
Personal injury and mass tort firms read this topic differently, because fees arrive at settlement rather than through monthly invoices. There is no aging report full of client balances to chase; for most of a case's life, fee AR sits near zero, then it exists briefly between settlement and disbursement. The money pressure lives somewhere else on the balance sheet.
Advanced client costs behave like the receivable that AR reports never show. Filing fees, records retrieval, and case costs go out the door for years before a matter resolves, and they come back only when the case does. Managing that balance is a financing and forecasting exercise, not a collections cadence, and settlement proceeds route through the trust account with fee transfers following state rules rather than an invoice cycle.
If that is your firm, the receivable playbook above applies mostly to any hourly or subrogation work on the side. The core discipline is planning around irregular settlement clusters, which we cover in our law firm cash flow guide. Cost financing structures get a full treatment in our mass tort financing breakdown.
Where to Start This Month
Three moves cover most of the ground. Put the client balance rule into your engagement letters and your weekly reporting, so trust funds always exceed WIP plus AR before new work begins. Stand up the collections cadence so every invoice follows the same sequence without anyone having to play collector. And read the aging report weekly, with the over-90 share as your tripwire.
We currently support more than 130 law firms, and receivables discipline is one of the first things our controller-level service builds, because it is the fastest route from billed revenue to money in the bank. If your aging report is a mystery, or nobody at the firm owns it, schedule a consultation and we will walk through your numbers with you. You will know within one meeting whether the problem is structure, staffing, or cadence.
Sources
• Clio, Legal Trends Report (2025): realization rate, collection rate, and lockup benchmarks.
• Mark Powers and Shawn McNalis, Cashflow & Profitability: What Law School Didn't Teach You About Running a Successful Law Firm.
• Mori Kabiri, Law Firm KPIs: The Professional's Handbook for Pricing, Productivity, Profitability.
Frequently Asked Questions
What is accounts receivable for a law firm?
Accounts receivable is fee revenue the firm has billed to clients but not yet collected. It differs from WIP, which is work performed but not yet billed. Together they measure how much of the firm's completed work is still waiting to become cash.
What is a good collection rate for a law firm?
Clio's 2025 Legal Trends Report puts the average law firm collection rate at 93 percent. Powers and McNalis set 95 percent of billed fees as the working target for hourly firms. If your rate sits below the low 90s, or receivables over 90 days exceed 10 percent of total AR, collections needs structural attention rather than more reminder emails.
What is an evergreen retainer?
An evergreen retainer is a client trust deposit that the client replenishes as the firm bills against it, keeping the balance above an agreed floor for the life of the matter. The engagement letter sets the floor and authorizes the firm to apply trust funds to invoices as fees are earned. It keeps the client's funds ahead of WIP and AR so the firm never becomes an unsecured lender.
What is the difference between realization rate and collection rate?
Realization rate measures how much recorded billable value actually reaches an invoice, so it captures write-downs and discounts. Collection rate measures how much of the invoiced amount is actually paid. A firm can have strong realization and weak collection, or the reverse, and each failure calls for a different fix.
Should a law firm sue a client for unpaid fees?
Treat fee litigation as a last resort. Suing a former client invites a malpractice counterclaim, consumes attorney time, and rarely nets the full ledger balance. A payment plan, a negotiated settlement, or a clean write-off usually costs less, and the real fix is upstream: retainer structures that keep trust funds ahead of the balance.
