The Case for Mandating Long-Form Billing from Your Law Firms
Austerus Consultancy | Private Equity | Legal Spend | May 2026
For private equity and asset management firms, vague invoices are not a minor inconvenience — they are a governance failure. Here is why mandating long-form billing formats is one of the most consequential steps you can take to protect investor capital and hold outside counsel to account.
The Invoice That Tells You Nothing
Picture this: a law firm invoice arrives at the end of the month. It lists ten hours of "legal services rendered" in connection with a transaction, a disbursement entry reading "miscellaneous expenses — $4,200," and a grand total that runs well into five figures. There is no breakdown of who did what, no itemisation of time by task, no explanation of what the disbursements actually covered.
For many private equity and asset management firms, this is not a hypothetical — it is a routine experience. And it represents a fundamental problem: you are being asked to pay for work you cannot verify, by timekeepers you cannot assess, for disbursements you cannot scrutinise.
The solution is not to dispute every invoice after the fact. It is to mandate long-form billing formats before outside counsel puts pen to paper.
What Long-Form Billing Actually Means
Long-form billing — sometimes referred to as detailed or narrative billing — requires outside counsel to provide a granular, itemised record of every time entry and disbursement charged to a matter. Rather than a single block entry covering an entire day's work, each task is recorded individually, with a clear description of the work performed, the timekeeper responsible, the time spent, and the rate applied.
For disbursements, long-form billing requires an equivalent level of specificity: what was incurred, why it was incurred, who incurred it, and — where applicable — the supporting documentation to verify it.
"The invoice is not merely a payment request. It is a record of how your outside counsel allocates resources, prioritises work, and values their own time. It tells you more about a firm's culture than almost any other document."
This is not an unreasonable standard. It is, in fact, the standard that sophisticated institutional clients increasingly expect — and that the best law firms are well-equipped to meet. Resistance to detailed billing is itself a signal worth noting.
Why It Matters for Private Equity Firms
Private equity firms operate with a clear fiduciary obligation to their limited partners. Every dollar spent on legal fees is a dollar that comes directly from the fund — and ultimately from the returns delivered to investors. In this context, the inability to verify what legal fees are actually paying for is not merely an administrative inconvenience. It is a breach of the oversight standards that LPs rightly expect.
Long-form billing gives PE firms the visibility to identify specific billing practices that inflate costs without adding value — block billing, where multiple tasks are bundled into a single time entry; excessive senior partner involvement in tasks that could be delegated to junior timekeepers; and the routine addition of disbursements that bear no clear relationship to the matter at hand.
Common Billing Irregularities — What Long-Form Billing Reveals
- Block billing — multiple tasks bundled into a single indivisible time entry
- Excessive partner involvement in routine or administrative tasks
- Duplicated time entries across multiple timekeepers for the same task
- Vague disbursement descriptions masking unrelated or unauthorised expenses
- Rate creep — timekeepers billing at rates above those agreed in the retainer
- Unnecessary research time on settled or well-established legal principles
- Internal communications billed at full hourly rates
- Travel time billed at rates inconsistent with agreed billing guidelines
When billing guidelines mandate long-form formats, these practices become immediately visible — and, critically, they become difficult to repeat. Outside counsel who know their invoices will be reviewed line by line tend to produce invoices that can withstand that scrutiny.
Why It Matters for Asset Management Firms
For asset managers, the challenge is compounded by the structural complexity of the business. Legal spend is not confined to a single transaction stream — it is distributed across fund formation, regulatory compliance, portfolio company matters, investor relations, and management company operations. Each of these workstreams may involve different outside counsel, different billing arrangements, and different expectations around cost.
Without long-form billing requirements applied consistently across all outside counsel relationships, asset managers are left with an aggregated legal spend figure that tells them very little about where value is being delivered and where costs are drifting. Long-form billing makes it possible to conduct meaningful analysis across workstreams — identifying which matters are running over budget, which counsel relationships are performing efficiently, and where the firm's billing guidelines are being observed or quietly ignored.
For asset managers with obligations to investors around cost management and operational efficiency, the ability to demonstrate rigorous oversight of legal spend is not merely a matter of internal governance. It is increasingly a component of the due diligence conversation with institutional investors who want to know that management fees and fund expenses are being managed with the same discipline applied to the investment portfolio itself.
"Institutional investors are asking harder questions about legal spend than ever before. Long-form billing gives asset managers the data to answer them — and the credibility that comes from having asked those questions themselves."
Mandating the Standard — How to Do It
The most effective mechanism for mandating long-form billing is a well-drafted set of Outside Counsel Guidelines (OCGs) — a document issued to all external law firms that sets out the billing standards, timekeeper requirements, disbursement policies, and invoice format specifications that the firm expects to be observed as a condition of engagement.
Effective OCGs do not simply request detailed billing in general terms. They specify exactly what a compliant time entry must contain — the date, the timekeeper name and seniority, the matter reference, a task description sufficient to identify the nature of the work without reference to privileged content, the time recorded in minimum increments, and the applicable rate. They apply the same specificity to disbursements, defining which categories of expense are recoverable, what documentation is required, and what requires pre-approval.
Critically, OCGs should also establish the consequence of non-compliance. An invoice that does not meet the required standard should be returned for revision — not simply paid with reservations noted. Outside counsel who understand that non-compliant invoices will not be processed have a direct commercial incentive to get it right the first time.
The Disbursement Problem
Time recording tends to receive the most attention in billing governance discussions — but disbursements deserve equal scrutiny, and in practice they are often where the most significant irregularities occur.
Disbursements can include court fees, counsel's fees, travel and accommodation, document production costs, expert fees, registration charges, and a broad category frequently described as "miscellaneous" or "out-of-pocket expenses." The last category, in particular, has a tendency to expand in the absence of clear guidelines.
Long-form billing requirements applied to disbursements should specify that every item is individually listed with a description, the amount charged, the date incurred, and — where the amount exceeds an agreed threshold — supporting documentation. Mark-ups on disbursements, where a firm charges a percentage above the actual cost incurred, should be explicitly prohibited or capped. Pre-approval requirements for significant disbursements — travel, experts, counsel — should be standard.
Firms that implement these requirements consistently find that disbursement costs fall meaningfully, not because they were being deliberately inflated before, but because the requirement to justify every charge creates a natural discipline that did not previously exist.
A Relationship Built on Transparency
It is worth addressing a concern that some PE and asset management firms raise when considering the implementation of long-form billing mandates: the worry that imposing detailed requirements will damage their relationships with outside counsel, particularly with firms they value and have worked with for years.
This concern is understandable, but it rests on a misapprehension. The best law firms — the ones delivering genuine value on complex, high-stakes matters — have nothing to fear from transparency. Their time is well-spent, their disbursements are legitimate, and their invoices will reflect that clearly when required to do so in detail. It is the firms that rely on the opacity of block billing and vague disbursement descriptions that will find long-form requirements uncomfortable.
In practice, the implementation of clear billing standards tends to strengthen outside counsel relationships rather than strain them. It establishes a shared framework of expectations, reduces the friction and tension that arises when invoices are queried, and creates a foundation of mutual accountability on which a productive long-term relationship can be built.
The Austerus Perspective
At Austerus Consultancy, we work with private equity firms and asset management firms to design and implement Outside Counsel Guidelines and billing governance frameworks that are tailored to the specific structure, deal flow, and counsel relationships of each client. We do not believe in generic templates. We believe in standards that are specific enough to be enforceable and sophisticated enough to reflect the real complexity of how institutional clients engage with outside counsel.
Long-form billing mandates are one of the most straightforward and highest-impact interventions available to firms that want to take genuine control of their legal spend. The data they generate supports better decisions about counsel selection, matter staffing, and budget management. The discipline they create changes the dynamic of the outside counsel relationship — from one in which the client receives whatever invoice the firm chooses to send, to one in which the client sets the standard and outside counsel rises to meet it.
That is not an adversarial position. It is simply good governance — and in today's environment, it is what investors and stakeholders increasingly expect.
Interested in implementing long-form billing standards across your outside counsel relationships? Get in touch to discuss how Austerus Consultancy can help.
We offer a structured entity billing audit that identifies exactly where unnecessary legal spend is occurring across your fund complex — and what it is costing your investors. Get in touch to arrange an initial conversation.
Contact Austerus Consultancy: info@austerusconsultancy.com www.austerusconsultancy.com
Austerus Consultancy provides operational and commercial advisory services to private equity firms. We do not provide legal, tax, or regulatory advice. All legal and tax matters should be referred to appropriately qualified professionals.
