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Life of a Billable Hour: Understanding the Law Firm Value Funnel

By Purvi Sanghvi posted 02-24-2025 11:33

  
Please enjoy this blog post co-authored by Purvi Sanghvi, Managing Director, Client Management, Paul Hastings LLP and Mitch Katzer, Data Analyst, Laurel.

Over the course of the next few months, Mitch Katzer and Purvi Sanghvi have teamed up to present a series of articles covering the business of law, the life of a billable hour, fee arrangements, and time hygiene. To lay the groundwork, this article centers around how firms are structured.
How Hours Transform to Dollars

How Hours Transform to Dollars
In this edition of our Law Firm Business series, we will break down the process by which a billable hour of work is transformed into revenue paid by clients, detailing each step along the way. For each step, we will highlight the roles involved, the jobs completed by each, and the key metrics to measure for improvement. This journey of a billable hour is often called the law firm’s Value Funnel because at each step there is potential for the revenue to be reduced from its full potential. Each stage of this process is so crucial to bottom line revenue, firms analyze their Value Funnel consistently and make investments to improve each step. This is because a marginal improvement, such as +1% improvement in conversion at any stage, can mean millions of dollars to the firm’s revenue and bottom line. Below is a depiction of a mock Value Funnel. Notice how at each stage, there is potential for meaningful leakage, which will be covered in the description of each step to follow.

Remaining Value by Billing Stage

1.     Time is Spent on Work
●       Role: Attorneys and Paralegals
Attorneys (partners, associates, and of-counsel) and paralegals spend time performing client work. Examples of this work are research, drafting documents, and client calls. Hours and minutes spent doing these activities are the raw materials and life blood of a law firm. While work is being completed, it is essential for the attorney to document the work or leverage a timekeeping solution with passive time capture, because being able to account for this time accurately is key to earning client trust and ensuring the firm has a solid and robust starting point to begin monetizing this work.
 
●       Key Metric(s):
      ○ Time Spend: Using intelligent and passive time capture tools, timekeepers and firms can understand how much time was truly spent doing work (on computer, phone, calendar, mobile, etc.), then break it down by technology, activity type, and specific applications. Of course, this is extremely helpful to create accurate timesheets and improve timekeeping practices.
 
■       This metric enables a firm to understand their completed Value Funnel, rather than first gaining visibility when a time entry arrives in the billing system. This measurement allows for better utilization, profitability, and capacity planning. My company Laurel is at the forefront of capturing and exposing this data which has never been available to firm leaders.

2. Time Entry
●       Role: Attorneys and Paralegals
After performing work on client tasks, the attorney or paralegal must convert the time worked into an official record in the form of a billing entry. These “atomic units” of a client bill account for time spent in increments of an hour based on agreement with the client. A common increment is “one tenth” of an hour (0.1 hour), representing every six minutes of work. Some increments can be as detailed as “hundredths” (0.01 hour) representing an accounting of every minute of time spent. As you can imagine, this step is tedious and error prone. Lawyers without a tool to help them capture and record their time spent often resort to starting and stopping manual timers when they switch tasks, keeping notes of the time, they spend in Microsoft Excel, and/or looking through digital artifacts (e.g. email outbox, calendar, etc.) to recreate their time.
 
The attorney logs details on the tasks performed, broken down by activity type (e.g., research, drafting, client calls, etc.), and describes the work completed in a narrative format so their client can understand what was done. Some firms and clients also require the timekeeper to apply phase, task, and activity codes that help further classify the entry for ease of understanding by the client and deeper analysis by the firm.
 
The process by which time begins its monetization is kicked off when a time entry is submitted to the billing system by the timekeeper. Time spent working that is never submitted for billing is lost potential revenue. This time/revenue is “left on the table,” causing firms to question “the why” behind these lapses in time recording, or explicit decisions by the timekeeper to not bill for the time. 

● Role: Legal Assistants/Support Staff (not all situations)
At some firms, legal assistants may help attorneys remember to log their time or perform timekeeping on behalf of attorneys, using key contextual information from the attorney to accurately represent the work completed. After this task is completed, the attorney will review the time and ensure its accuracy.
 
●       Key Metric(s):
     ○ Lag to Create Entry: Amount of time between client work being completed and billing entry being created.
     ○ Lag to Release Entry: Amount of time (days) between billing entry creation and release (submission) to the billing system. 
     ○ Granularity: # of entries released per workday. An increase in this metric can help defensibility of client bills by showing added detail of each discrete task completed.
     ○ Utilization: % of time spent doing billable work. Other types of work are: non-billable, administrative, pro-bono, etc. While some of this work is extremely important, it is not directly revenue-generating and thus the law firm wants to measure % time spent on billable work.
     ○ Daily Timekeeping Ratio: ratio comparing number of days worked and number of days where timekeeping (entry creation) takes place. This metric gives insight into how many days are building up before a timekeeper recounts their time and generates entries. The longer a timekeeper waits to “recreate” a timesheet, this can lead to slippage, lack of detail, and loss.

3. Review and Approval of Time Entries
Role: Supervising Attorneys or Project Managers
Senior associates, supervising attorneys, or project managers review time entries to ensure they meet client expectations and firm guidelines. They check for accuracy, compliance with billing guidelines, adjust any entries if necessary, and follow up with the timekeeper for clarification as needed.
There are additional rules to the monetization of a time entry, written when the matter is set up and agreed by the Firm-Client relationship. An example of this would be the fee agreement, in which the Firm and Client consent to some combination of time and materials (hourly), fixed fee, hybrid, and contingency. Other examples of Firm-Client agreements are: how time should be recorded, what can and cannot be billed to clients, standard billing rates, invoice format and content requirements, and expense policies.
Role: Billing Coordinators or Billing Specialists
In some firms, billing coordinators or specialists may run an initial audit to identify entries that could be potentially problematic (like excessive time on certain tasks) and flag them for further review. This sends the entries back to their timekeeper for revisions. 

Key Metric(s):
     ○ Internal Write-Down: Amount of worked hours reduced or removed from a potential bill before it goes to the client. Measured in hours and dollars (when the billing rate is considered) and can be measured as an absolute amount, per entry, or per hour worked. Write-downs can be done by:
     ■ Timekeeper at point of entry, often called “self-auditing” or “voluntary write-down.” Can be identified on a billable time entry by the difference between time worked and billed.
     ■ Their supervising attorney if they believe the work should not be charged for, the client will not pay for it, or to build goodwill with the client.

Invoice Preparation

4. Invoice Preparation
Role: Billing Department/Billing Coordinators
The billing department, led by billing coordinators and/or specialists, is primarily responsible for preparing draft client invoices. They compile all approved time entries and itemize them, ensuring descriptions are clear and rates are accurate.
At the end of each billing cycle, typically each month-end and the first business days of the new month, it is important to ensure all outstanding time is submitted to the billing system. Often this leads to a pressure-filled experience for the billing department, following up with timekeepers to gather unreleased time entries. Failure to release in time will result in billable time missing this cycle and being pushed to the next billing cycle. The longer this happens, the less likely a client will remember the work they’re paying for, and thus client write-offs increase, impacting revenue negatively. As such, firms implement timeliness policies to reduce pressure on the billing team’s chasing of timekeepers and ensure time gets on to bills for the month it was worked.

Key Metric(s):
     ○ Spillover: Percentage (or raw hours) of time worked in the current billing cycle that does not make it onto a bill and is thus forced into a subsequent bill. Reducing this will have positive impacts on client payment realization.
     ○ Outstanding Time %: Percentage of time still outstanding for the current billing cycle vs. forecasted by the billing team.

5. Invoice Review and Approval by Supervisors
Role: Partners, Senior Attorneys, Billing Department
Partners and/or senior attorneys conduct a final review of the invoice. They make sure the billed time reflects the value delivered to the client, and ensure the invoice follows any client-specific (i.e. outside counsel) guidelines. To check against guidelines, at this point some firms will use automated review technology to ensure they are not violating any documented guideline, which puts the billed value at risk. This is a last quality control check before the client sees the bill. Billing Departments make sure the final document is polished and ready for client delivery.

Key Metric(s):
    ○ Billing Realization: Percentage of time worked that makes it onto a client bill. By subtracting internal write-downs (see above) from time worked, the firm can see their potential revenue lost due to non-client (internal) reasons. Revenue written off before a client sees the bill is frustrating for law firms, because their client is not even given a chance to pay for this work.

6. Client Delivery
Role: Billing Department Coordinators
The billing team is responsible for sending the invoice to the client, whether through email, an electronic billing platform, or traditional mail. They track when invoices are sent and received. Occasionally a partner will reach out to the client about the bill as a relationship touchpoint.

Key Metric(s):
     ○ Billing Velocity: In # of days, this measures the length of time it takes from work being done to time being billed. Reducing this metric shortens the billing cycle and thus can have significant positive impacts by getting bills in front of clients faster, boosting likelihood of client payment (payment realization) and speed of revenue collection.
Billable hour

7. Client Review and Payment
Role: Attorneys, Client Relationship Managers, Billing Department
Attorneys, particularly the relationship partner for the client, may address any client questions or concerns about the invoice and work with the Billing Department to clarify any technical billing questions. Collectively, they work with the client to resolve disputes and clarify charges.

Key Metric(s):
     ○ Client Write-Offs: Clients can choose to dispute and/or write off any part of the bill they decide not to pay for. Client write-offs are extremely important to measure, as this can be an indication of inaccurate, untimely, or non-compliant bills getting out the door. It can also indicate a need for process improvement in earlier steps within this billing process. 
     ■ Having zero disputes or client write-offs can indicate a positive attorney-client relationship but can also indicate the attorney is proactively writing down bills to ensure the client does not object, potentially leaving money on the table. Most firms like to see some client write-offs because it indicates fair and aggressive billing.
     ■ Where possible, it is essential to understand the reason behind a write-off and document it to recognize and solve for patterns.

8. Payment Collection
Role: Billing Department
The billing department tracks outstanding invoices and sends reminders for unpaid bills. They are responsible for following up with clients about payments, ensuring cash flow remains steady.

Key Metric(s):
    ○ Collection Realization: Percentage of dollars sent out on an invoice that are paid by the client. This crucial measurement indicates quality of client relationships, billing aggressiveness, and other issues further upstream in the Value Funnel. If a firm can understand and attribute write-off rationale from clients, they are empowered to make changes to avoid them in the future. Firms also expect some level of loss at this stage will be caused by non-controllable client realities such as: macroeconomic environment, business cycles, misaligned incentives, misallocation in budgeting, insufficient cash on hand, etc.

9. Revenue Recognition and Reporting
Role: Finance Department/Accounting
Upon receipt of payment, the finance department records the revenue in the firm’s financials and reconciles it with projections. They analyze financial performance, tracking metrics like collections, write-offs, and realization rates to assess profitability.
Role: Partners or Managing Attorneys
Firm leadership, including partners and managing attorneys, use these reports to make strategic decisions. They assess client profitability and evaluate which types of work are most financially beneficial to the firm.

Key Metric(s):
    ○ Total Realization: Measuring a combination of Billing Realization and Collection (Client Payment) Realization, this metric provides the total % of a billable hour that is paid in the end. This is the key metric for the completed Value Funnel, as it describes in one number what portion of attorney work is converted to dollars.

Time


Parting Thoughts
In conclusion, the transformation of billable hours into revenue is a complex, multi-stage process that requires careful coordination across numerous roles within a law firm. From the initial step of performing legal work for clients all the way through collection of payments from clients, each step of the Value Funnel presents an opportunity to increase conversion and revenue realization that firms must actively manage. Success requires not just diligent timekeeping and billing practices, but also robust systems, clear processes, and careful attention to metrics at every stage. Deeply understanding the Value Funnel and associated metrics enables firms to make incremental improvements in areas like time entry, billing velocity, or realization rates, translating to substantial revenue gains. The key to maximizing revenue lies in viewing the process holistically while simultaneously monitoring and refining each individual stage through targeted metric tracking and continuous process improvement.

If you missed the first article, 'Understanding How Law Firms Are Structured as a Business' check it out here.




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