Law firms, consulting firms, accounting firms, agencies, and other professional services businesses often use billable hours to measure client work and prepare invoices. If the work directly supports a client matter, project, case, or engagement, it may count as billable time.
Simple example A lawyer spends one hour reviewing a contract for a client. That one hour is a billable hour. If the same lawyer spends one hour in an internal firm meeting that is not tied to a client matter, that time is usually non billable.
The exact rules depend on the client agreement, the firm's billing policy, and the type of work performed.
Billable Hours MeaningBillable Hours Meaning
Billable hours are time spent on client related work that can be invoiced.
The word "billable" means chargeable to a client. When professionals record billable hours, they are documenting the time they spent delivering client value.
In a law firm, billable hours may include legal research, document drafting, contract review, client calls, case preparation, court filing preparation, and matter related emails.
In a consulting firm, billable hours may include client workshops, research, analysis, implementation work, reporting, and advisory calls.
In an accounting firm, billable hours may include tax preparation, audit work, bookkeeping review, compliance support, and client advisory work.
How Billable Hours WorkHow Billable Hours Work
Billable hours usually follow a simple process.
First, the professional performs work for a client.
Second, the professional records the time spent on that work.
Third, the time is connected to the right client, matter, or project.
Fourth, the time entry is reviewed.
Fifth, approved time may be included in an invoice.
Example A lawyer spends 30 minutes reviewing a lease agreement. The firm records 0.5 billable hours. That time is assigned to the client matter and may later appear on the client invoice.
The key point is that billable hours need to be captured accurately. If the work is performed but not recorded, the firm may lose revenue from work already completed.
What Counts as Billable Hours?What Counts as Billable Hours?
Billable hours usually include work that directly supports a client.
Client calls and meetings
Legal research
Document drafting
Contract review
Matter related emails
Case strategy work
Court preparation
Client project planning
Consulting analysis
Technical implementation work
Tax preparation
Audit support
Client reporting
The work needs to be connected to a client outcome. If it helps move the client's matter, project, or engagement forward and the agreement allows the firm to charge for it, it is likely billable.
What Does Not Count as Billable Hours?
What Does Not Count as Billable Hours?
Non billable hours are work hours that cannot be directly charged to a client.
Non billable work can still be important. It simply does not usually appear on a client invoice.
Internal team meetings
General administration
Training
Marketing
Business development
Recruiting
Internal reporting
Software setup
Company planning
Personal development
General research not tied to a client matter
For example, a lawyer attending a firmwide training session is usually doing non billable work. A lawyer preparing for a client negotiation is usually doing billable work.
Billable Hours Examples
Legal exampleA lawyer reviews a revised purchase agreement and prepares comments for the client. That time is usually billable. Consulting exampleA consultant prepares a market analysis report for a client. That time is usually billable. Accounting exampleAn accountant prepares tax filings for a client. That time is usually billable. Agency exampleA strategist prepares a campaign plan for a client account. That time is usually billable. IT services exampleAn engineer configures a client's backup environment. That time is usually billable.
Billable Hours vs Non Billable Hours
The difference is whether the time can be charged to a client.
Billable hours are connected to client work and can usually become revenue. Non billable hours support the business but are not usually charged directly to a client.
BillableReviewing a contract for a client Non billableAttending internal HR training BillablePreparing a client report Non billableUpdating internal templates BillableJoining a client project meeting Non billableJoining a general company meeting
The distinction matters because firms need to understand how much time is spent generating client revenue and how much time is spent supporting internal operations. For a deeper comparison, see billable vs non billable hours.
Why Billable Hours Matter
Billable hours matter because they connect work performed with revenue earned.
For law firms and other professional services businesses, accurate billable hours help with:
Revenue capture
Client billing
Work in progress visibility
Profitability analysis
Resource planning
Project management
Timekeeper productivity
Client transparency
Billing review
Missed billable hours can create real financial loss. A professional may complete the work, but if the time is not recorded, the firm may never bill for it.
Why Billable Hours Get Missed
Billable hours are often missed because client work happens across many places.
A lawyer may switch between emails, calls, documents, research, meetings, and internal discussions throughout the day. By the time the lawyer records time, small tasks may be forgotten.
Time is entered too late.
Short tasks are forgotten.
Calendar meetings are not reviewed.
Work happens across too many systems.
Manual timers are not started.
Descriptions are written from memory.
Emails and calls are not captured.
Lawyers dislike manual time entry.
Billing review happens after details are already forgotten.
Small missed tasks may not look serious in isolation. Across many people and many matters, they can add up quickly.
How Law Firms Track Billable Hours
Law firms usually track billable hours by recording time against a client and matter.
A legal time entry normally includes:
Date
Timekeeper
Client
Matter
Amount of time
Description of work
Billing code or task code when required
Billable or non billable status
Review or approval status
Description quality A weak time entry might say: "Worked on agreement." A stronger time entry might say: "Reviewed revised service agreement and prepared comments regarding liability, renewal, and termination provisions." The second description is better because it explains the work more clearly.
Modern legal timekeeping software and legal time entry software can help firms improve this workflow.
Common Billable Hour Increments
Many law firms record time in increments instead of exact minutes.
Common increments include six minutes, ten minutes, or fifteen minutes, depending on the firm and client agreement.
For example, if a firm uses six minute increments, one hour is divided into ten units. A twelve minute task may be recorded as 0.2 hours.
The exact increment should follow the firm's billing policy and client agreement.
How to Calculate Billable Hours
To calculate billable hours, add up the time spent on client work that can be charged.
Contract review1.2 hours Client call0.5 hours Legal research2.0 hours Drafting email advice0.3 hours
Total billable time: 4.0 hours.
If the lawyer's hourly rate is $300, the billable value is 4.0 hours multiplied by $300, which equals $1,200.
This is the billable value before any write offs, discounts, adjustments, or client billing rules.
Billable Hours, Rates, and Utilization
Billable Hours and Hourly Rates
A billable hour often connects to a billable rate.
The billable rate is the amount charged for one hour of work.
Partner rate: $600 per hour
Associate rate: $350 per hour
Paralegal rate: $150 per hour
If an associate records two billable hours at $350 per hour, the billable value is $700.
Different roles may have different rates because their experience, responsibility, and contribution differ.
Billable Hours and Utilization
Billable utilization measures how much working time is spent on billable client work.
Utilization example A consultant works 40 hours in one week. 24 hours are billable. The billable utilization rate is 60 percent.
Utilization helps firms understand how much time is spent on revenue generating work. However, it should not be treated as the only measure of performance. Non billable work such as training, business development, knowledge sharing, and management can also be valuable.
Billable Hours and Write Offs
Recorded billable hours do not always become billed revenue.
Sometimes time is written off or reduced before the invoice is sent. This may happen because the work exceeded budget, the description was unclear, the client agreement does not allow certain charges, or the firm decides not to bill the full amount.
This is why accurate time tracking and clear descriptions matter. Better time entries are easier to review, easier to justify, and easier for clients to understand.
Best Practices and Common Mistakes
Best Practices for Tracking Billable Hours
Firms can improve billable hour tracking with a few practical habits.
Record time as close to the work as possible.
Use clear descriptions.
Connect each entry to the right client and matter.
Review calendar events daily.
Track short tasks before they are forgotten.
Avoid vague descriptions.
Separate billable and non billable work.
Use billing codes consistently when required.
Review missing time before billing.
Use timekeeping software that fits daily workflows.
The best system is the one professionals will actually use. For firms evaluating software, billable time tracking is a natural next step.
Common Mistakes with Billable Hours
Common mistakes include:
Waiting until the end of the week to enter time.
Relying only on memory.
Using generic descriptions.
Forgetting short calls and emails.
Recording time under the wrong matter.
Mixing billable and non billable work.
Ignoring calendar based work.
Not reviewing entries before billing.
Using tools that create too much friction.
Most billable hour problems are workflow problems. The easier it is to capture and review work, the more accurate the time record becomes.
Are Billable Hours Still Important?
Yes. Even though some firms use fixed fees, subscriptions, contingency fees, or alternative fee arrangements, billable hours still matter.
They help firms understand:
How much work was required
Whether a project was profitable
Which clients require more effort
Whether pricing is realistic
How much non billable work is being performed
Where work is being missed
Even when the client does not pay by the hour, tracking time can still help the firm manage profitability and workload.
Billable Hours in Law Firms
Billable hours are especially important in legal services because many law firms still bill based on time.
A lawyer's day may include many small tasks across several matters. Each task needs to be captured accurately and described clearly.
Reviewing evidence
Drafting a motion
Preparing for a hearing
Writing client advice
Reviewing contracts
Researching legal issues
Joining a client call
Communicating with opposing counsel
If these tasks are missed or recorded poorly, the firm may lose revenue or face billing questions.
How Technology Helps Track Billable Hours
Technology can help firms capture billable hours more accurately by reducing reliance on memory.
Good timekeeping software can help professionals:
Capture activity from daily work tools
Review time before billing
Track calendar based work
Improve descriptions
Organize entries by matter or project
Reduce manual reconstruction
Send approved entries to finance or billing systems
The goal is not to make time tracking more complicated. The goal is to make accurate time capture easier. Firms that want to reduce manual reconstruction may also evaluate automated time tracking for lawyers, AI time tracking for lawyers, and billing compliance automation.
For a connected workflow, explore Billable Time Tracking for Law Firms.
Billable Hours Summary
Billable hours are hours spent on client work that can be charged.
They are important because they connect professional work with revenue, billing accuracy, project profitability, and client transparency.
The biggest risk is not only doing non billable work. The bigger risk is doing billable work and failing to record it properly.
Accurate billable hour tracking helps firms capture earned revenue, reduce billing confusion, and understand how work is being performed.
Related Resources
Frequently Asked Questions
What are billable hours?
Billable hours are hours spent on client work that can be charged to the client. They are commonly used by law firms, consulting firms, accounting firms, agencies, and other professional services businesses.
What is an example of a billable hour?
An example of a billable hour is a lawyer spending one hour reviewing a contract for a client. That hour can usually be recorded and included in the client invoice.
What is the difference between billable and non billable hours?
Billable hours are client related hours that can be charged. Non billable hours are work hours that support the business but are not usually charged directly to a client, such as internal meetings, training, or administration.
Why are billable hours important?
Billable hours are important because they connect client work with revenue. Accurate billable hour tracking helps firms capture earned revenue, manage workload, and prepare clearer invoices.
How do lawyers track billable hours?
Lawyers usually track billable hours by recording time against a client and matter, adding a description of the work performed, and submitting the entry for billing review.
Can billable hours be written off?
Yes. Recorded billable hours may be reduced or written off before invoicing due to client agreements, budget limits, unclear descriptions, or firm decisions.
Are billable hours only used by law firms?
No. Billable hours are also used by consulting firms, accounting firms, agencies, IT services firms, and other professional services businesses.
How can firms track billable hours more accurately?
Firms can track billable hours more accurately by recording time promptly, using clear descriptions, reviewing calendar activity, capturing short tasks, and using timekeeping software that fits daily workflows.
