How to Convert Client Emails into Billable Time Entries

Email is the most underrecorded source of billable time in legal practice. Lawyers send and receive dozens of client-related emails daily, each representing work that took anywhere from 6 minutes to an hour. Yet a significant portion of this work never makes it into a time entry.

The problem is not that lawyers forget about emails. It is that the task of reading an email, doing the work, replying, and then switching to a time recording system to write a separate billing description for the same work feels redundant and disruptive.

This guide covers practical approaches to converting email correspondence into properly recorded billing entries, from manual workflows to AI-assisted automation.

Why Email Time Gets Lost

Email billing leakage happens for several reasons. Short emails (under 5 minutes) feel too small to record. Complex email chains involve multiple topics across multiple matters, making it unclear how to allocate time. The context switch from email client to billing system interrupts workflow. And by the end of the day, it is impossible to reconstruct which emails took 6 minutes and which took 30.

The cumulative impact is substantial. A lawyer who handles 20 client-related emails per day and fails to record half of them at an average of 0.1 hours each is losing one billable hour per day — over $90,000 per year at $400 per hour.

The Manual Approach: Batch and Record

The simplest improvement requires no tools at all. At the end of each day, open your Sent folder and scan for client emails. For each one, create a billing entry with the matter reference, a brief description of the correspondence and its purpose, and the time spent (round up to the nearest 6-minute unit).

This approach works, but it relies on discipline and typically captures only outgoing emails. Incoming emails that required reading and consideration but no reply — such as reviewing a document a client forwarded — often get missed.

The Structured Approach: Tag and Capture

A more reliable method is to create a systematic capture process. In Outlook or Gmail, flag or label client emails immediately as you handle them. Use a consistent naming convention like the matter number or client name. At the end of the day, review your flagged emails and batch-create billing entries from them.

Some practice management systems integrate with Outlook to assist with this. LEAP, for example, allows you to save emails directly to matters, which creates a record you can later convert to a time entry. Clio has a similar email-to-matter feature.

Billing Descriptions for Email Correspondence

The most common mistake with email billing entries is writing descriptions that are too generic. "Email to client" or "Correspondence re matter" tells neither the client nor a costs assessor anything useful about the work performed.

A well-written email billing description should describe the subject of the correspondence, the action taken, and any advice given. For example:

Perusal of correspondence from opposing solicitor regarding proposed amendments to clause 8.3 of the shareholders' agreement and preparing and forwarding detailed response thereto, including analysis of proposed restraint of trade provision and recommendation to reject same.

Compare that with "Email re shareholders agreement" — both describe the same work, but only the first version communicates the value of the time spent and would survive scrutiny on costs assessment.

Using AI to Convert Emails to Billing Entries

The most efficient approach for high-volume email correspondence is to use AI tools that can read the email content and generate a proper billing description automatically. This eliminates the manual effort of writing descriptions while producing more detailed and professional output than most lawyers would create manually.

LexUnits includes a dedicated Email to Attendance Note feature that analyses email threads and generates billing entries with appropriate time estimates, professional descriptions, and the correct formatting for your practice management system. You paste in the email chain (or upload it as a file), and the AI identifies the billable work performed, the time likely spent, and generates entries that you review before exporting.

This approach is particularly effective for complex email chains that span multiple topics or matters, where manually decomposing the work into separate billing entries would take significant time.

Common Email Billing Scenarios

Building the Habit

Whatever method you choose, the key is consistency. Set a daily reminder for 5pm to review your email and create billing entries for any unrecorded work. Over time, this becomes automatic — and the impact on your monthly billing numbers will be noticeable within the first month.

The firms that bill effectively for email work are not the ones that spend more time on email. They are the ones that have a system for capturing the time they already spend.

Frequently Asked Questions

Should I bill for reading every client email?

You should bill for any email that requires you to apply your professional judgment, review documents, consider the matter, or take action on behalf of the client. Purely administrative emails (meeting confirmations, document receipt acknowledgments) are generally not billed, but anything that involves legal consideration is billable work.

How do I bill for a long email chain that covers multiple matters?

Split the billing entry by matter. Allocate time to each matter based on the proportion of the chain that relates to each. Each matter should receive its own entry with a description specific to the work performed on that matter.

What is the minimum time I can bill for an email?

Under the 6-minute unit system, the minimum billable time is 0.1 hours (6 minutes). If reading and responding to an email took less than 6 minutes, you still record 0.1 hours. This is standard practice and is built into how the 6-minute unit system works.

Last updated: March 2026. This guide is for general informational purposes and does not constitute legal advice.