Most court coverage follows the fight between a plaintiff and a defendant. A second category of dispute runs alongside it and rarely makes the news: disagreements within the legal profession itself. They surface when a client challenges a bill, when two firms that shared a case disagree over how the fee should be divided, when a partnership dissolves, or when the commercial relationship between a law firm and the party that financed its case has to be construed.
These situations are not unusual, and they are not evidence of anything improper. They are the ordinary friction of a professional services industry in which large sums change hands over long periods. What follows is a plain account of where such disputes come from, which rules and procedures govern them, and how they are generally resolved.
The four places these disputes usually start
Almost every financial dispute inside the legal profession traces back to one of four relationships. Each has its own governing rules, its own forum, and its own documentary record – and the differences matter, because a dispute that looks like a billing argument may in fact be a contract question or a professional liability question.
The first is the relationship between a lawyer and a client. The second is the relationship between lawyers who worked on the same matter: co-counsel, referral partners, or partners in the same firm. The third is the relationship between a law firm or claimant and a third-party funder that advanced money against the outcome of a case. The fourth is the professional liability relationship that sits behind every engagement, usually intermediated by an insurer.
When a client disputes the bill
Fee disputes are the most common form, and they typically begin with a gap between what the client expected to pay and what the invoice says. Scope can expand. Hourly rates can rise during a long matter. A settlement can arrive earlier or later than anyone projected. ABA Model Rule 1.5 requires that a lawyer not charge an unreasonable fee and that the basis or rate of the fee be communicated to the client, preferably in writing, before or within a reasonable time after the representation begins. Changes to that rate should also be communicated.
When expectations diverge, many jurisdictions offer a route that does not run through a courtroom. California, for example, operates a Mandatory Fee Arbitration Program: participation is mandatory for the lawyer if the client requests it and voluntary for the client, and the process is designed to be confidential and lower-cost than litigation. An award becomes binding if no party seeks a trial after arbitration within the time allowed, and parties can agree in writing to make it binding from the outset. Because the procedure is unfamiliar to many consumers, lawyers in some states must give written notice of the right to arbitrate before suing to collect a fee, and failure to give that notice can be grounds for dismissal of the collection action.
Detailed assessment in England and Wales
England and Wales takes a different route. Under section 70 of the Solicitors Act 1974, a client who applies within one month of delivery of a bill is entitled to have that bill assessed by the court, and the solicitor may not begin an action on the bill in the meantime. Applications made later are possible, but the court has discretion; after twelve months from delivery, or after payment, an order generally requires special circumstances. One distinctive feature is the “one-fifth rule” in section 70(9): if the bill is reduced by more than one fifth, the solicitor normally bears the costs of the assessment, and otherwise the client does. The assessment is conducted under the Civil Procedure Rules, and costs are assessed on the indemnity basis – a test of whether the costs were reasonable, rather than proportionate.
When lawyers disagree with each other about the fee
Fee division between lawyers who are not in the same firm is governed by its own rule. Where adopted, ABA Model Rule 1.5(e) permits a division of fees only if the division is proportionate to the services each lawyer performed, or each assumes joint responsibility for the representation; the client agrees to the arrangement in writing, including each lawyer’s share; and the total fee is reasonable. Those three conditions are precisely why co-counsel agreements are best documented at the outset rather than reconstructed later.
A separate and more technical category concerns the lawyer who is discharged partway through a matter, or a firm that breaks up while a contingency matter is still running. The question here is often what compensation is owed for work already done – frequently analysed under the equitable principle of quantum meruit, meaning “as much as he deserves.” The answer depends heavily on the engagement agreement, the jurisdiction, and whether the original fee was contingent on a result that has not yet arrived. These outcomes tend to be fact-specific rather than governed by a single rule.
Where litigation funding fits in
Over the past two decades, a third relationship has become a normal part of high-value commercial litigation: third-party litigation funding. A funder – typically an investment fund rather than a party to the dispute – pays some or all of the costs of a claim in return for a share of any recovery. The structure is usually non-recourse: if the claim fails, the funder recovers nothing and the claimant does not repay the advance. Returns are commonly expressed as a multiple of the capital deployed, a percentage of the recovery, or a hybrid of the two, and the terms are negotiated case by case.
The market has grown into a recognisable asset class. Westfleet Advisors, which publishes an annual survey of the US commercial litigation finance sector, reported that capital commitments to new deals rose by roughly 23% in the twelve months covered by its 2025 report compared with the prior period, with an average transaction size of about $8.1 million and portfolio transactions averaging around $19.6 million. Legal-industry coverage offering industry insights has tracked how these arrangements have become a standard feature of large, multi-jurisdiction disputes. As with any long-term commercial contract, the terms that govern the relationship – how proceeds are defined, who controls settlement strategy, and how the parties resolve a disagreement – are the terms that matter most.
Regulation is a patchwork. England and Wales relies on self-regulation: the Association of Litigation Funders, charged by the Ministry of Justice with that role, maintains a Code of Conduct that sets minimum capital requirements, addresses control of case strategy and settlement approval, and limits the circumstances in which a funder may withdraw. In the United States there is no single federal framework; instead, disclosure requirements have emerged through individual court rules and standing orders, and a growing number of states have enacted their own disclosure provisions. Professional guidance has developed alongside: the ABA has published best practices for lawyers whose clients use funding, while ethics committees such as the New York City Bar and the State Bar of California have issued opinions on conflicts and confidentiality when a third party is paying the bills.
Reading the funding agreement: the clauses disputes turn on
When a funder and a firm or claimant disagree, the dispute is usually a question of contract rather than conduct. The recurring issues are definitional and structural. How is “proceeds” or a “recovery event” defined, and does the definition capture sums connected to claims the funder did not finance? Where does the funder sit in the payment waterfall relative to other creditors and to the lawyers? Is there security or an assignment of proceeds (the definitions are usually bespoke rather than standard-form), and what happens to it if a case settles in stages? And which dispute-resolution clause applies – many funding agreements route disagreements to confidential arbitration, which is one reason the resulting decisions are hard to study from the outside.
Because these are negotiated commercial terms, disagreements about them are best understood as the normal friction of contract interpretation. The practical lesson mirrors the one that applies to any complex services agreement: the more clearly the document allocates outcomes in advance, the fewer questions a tribunal has to answer later.
Malpractice claims: the insurer is often the engine
The fourth relationship produces what most people picture when they hear about lawyers being sued. Professional negligence claims against law firms are, in practice, driven largely by insurers and their claims data. Aon’s annual review of lawyers’ professional liability notifications, covering policy years 2005 through 2024, found that alleged mistakes accounted for 56% of notifications and 51% of the dollars paid, with commercial litigation the most frequent source of claims at 25% of notifications. Ames & Gough’s survey of major legal malpractice insurers reported that claim severity had reached an all-time high, with most surveyed insurers having participated in a payout above $100 million during the preceding two years.
Those figures describe a responding system rather than a pattern of misconduct. Insurers investigate and, where warranted, settle or defend; the claims data is used to price risk and to give firms feedback on where errors cluster. In many instances a professional liability claim and a fee dispute arise from the same matter, which is one reason the two are often handled in sequence rather than simultaneously.
Comparing the routes
The table below maps the four relationships to the forum that usually handles them and the documents that typically decide the outcome.
| Type of dispute | Typical forum | Documents that usually decide it |
|---|---|---|
| Client and lawyer over fees | Bar fee arbitration in many US states; court assessment under the Solicitors Act 1974 in England and Wales | Engagement letter, invoices, contemporaneous time records |
| Lawyer and lawyer over fee division | Contract or partnership claim; arbitration if the parties agreed to it | Co-counsel or referral agreement, written client consent, partnership deed |
| Firm or claimant and funder over recovery | Arbitration under the funding agreement; court in some cases | Litigation funding agreement, assignment or security, payment waterfall schedule |
| Client and lawyer over professional negligence | Professional liability claim, often insurer-led; court or ADR | Engagement letter, file records, limitation dates |
Compiled from the ABA Model Rules, the State Bar of California Mandatory Fee Arbitration Program, the Solicitors Act 1974 and CPR Part 67, and the Association of Litigation Funders Code of Conduct. The table is illustrative; the applicable forum and procedure depend on the jurisdiction and the terms of the individual agreement.
What tends to reduce these disputes
The procedures above are reactive. The factors that keep disputes from arising in the first place are mostly documentary and communicative.
- A written engagement letter that states the scope, the fee basis, and who is responsible for which expenses. Model Rule 1.5 points in this direction even where the rule only says “preferably in writing.”
- Itemised, contemporaneous time and billing records. In an assessment, the party claiming the costs generally carries the evidential burden of justifying them, so records created as work is done tend to be more persuasive than reconstructions.
- Prompt notice of rate and scope changes. Many billing disagreements are really communication disagreements that hardened into a formal claim.
- A written co-counsel or referral agreement signed before work begins, together with the client’s written consent where a fee is divided.
- Funding agreements that define proceeds, control, and dispute resolution explicitly, rather than leaving the parties to argue about intent later.
Frequently asked questions
Can a lawyer sue a client for unpaid fees?
Generally yes, but the process is usually regulated. In many US states a lawyer must first notify the client of the right to fee arbitration and, where required, participate in that process in good faith. Failure to provide the required notice can result in dismissal of the collection action. The specific requirements vary by state.
Is fee arbitration binding?
It depends on the program and the parties’ choices. In California, an award becomes binding if neither party requests a trial after arbitration within 30 days, and the parties may agree in writing to make it binding from the start. Some jurisdictions operate programs that are binding when both sides agree in advance.
Can two law firms share a fee from the same client?
Often yes, subject to conditions. Where ABA Model Rule 1.5(e) applies, the division must be proportionate to the services performed or the joint responsibility assumed, the client must agree in writing including each lawyer’s share, and the total fee must remain reasonable. Local variations exist.
Are litigation funding agreements public?
Frequently not. Many are confidential and include arbitration clauses, so disputes are resolved privately. A growing number of courts and states now require disclosure of funding arrangements in certain cases, so the position depends on the forum and the type of matter.
What happens if a funded case loses?
In a typical non-recourse arrangement, the funder recovers nothing and the claimant does not repay the funding. Because structures are negotiated individually, the exact consequences depend on the terms of the agreement and the jurisdiction.
Do malpractice claims always result in payment?
No. Frequency, severity, and settlement rates vary widely by jurisdiction, practice area, and year. Canadian insurer LAWPRO, for example, reported that 88% of its claim files in 2024 closed without any indemnity payment, while some US insurers have reported large individual payouts. The range reflects differences in the underlying matters, not a single national pattern.
How this article was put together
This article set out to explain, in neutral terms, how financial disputes within the legal profession arise and are resolved. It draws on the ABA Model Rules of Professional Conduct and ABA materials on fee arbitration and litigation funding; the State Bar of California’s fee arbitration rules; the Solicitors Act 1974, CPR Part 67, and England and Wales guidance on solicitor-and-client assessments; the Association of Litigation Funders Code of Conduct; and market and claims data published by Westfleet Advisors, Aon, and Ames & Gough. Figures are current as of the sources’ publication dates and should be rechecked annually. Rules described here vary by jurisdiction, and nothing in this article is legal advice for a specific matter.
