Every six minutes of unbilled work is money left on the table. For an attorney billing at $300 an hour, a forgotten 30-minute task costs $150. Most firms expect attorneys to bill between 1,700 and 2,300 hours per year. Yet the average lawyer logs just 2.9 billable hours per workday. An attorney who logs time at the end of the workday instead of in real time loses an estimated 10-15% of billable hours every month.
An attorney billing chart closes the gap. It converts the exact minutes you actually worked into the decimal your invoice needs. No estimation, no rounding guesses, no lost entries. When used consistently, it is the simplest system a solo attorney or a small firm can put in place to protect billable revenue without adding administrative overhead.
This guide covers the complete attorney billing increment chart, how to use it step by step, and the billing practices that keep every-six minute increment accounted for.
What is an Attorney’s Billing Chart?
An attorney billing chart is a reference table that converts minutes worked into a standard decimal billing increment. Law firms do not invoice raw minutes. They invoice in fractions of an hour. That’s how a 45-minute task becomes 0.8 hours. A 12-minute call becomes 0.2.
The chart makes that conversion instant and consistent across every timekeeper in the firm.
Most billing software has this built in, but attorneys and paralegals still reference the chart manually. It is common, especially when reviewing time entries before invoices go out.
If you get a decimal wrong at the entry stage means either the client is undercharged or it triggers a dispute at invoice review.
In small firms, that review usually falls to the paralegal or legal assistant.
What is an attorney billing increment chart?
The attorney billing chart is the specific conversion table attorneys and paralegals use during time entry. It is the minute-to-decimal reference behind the broader billing system.
The broader billing chart refers to the overall invoicing structure. The increment chart is the working tool inside it.
In practice, these terms are used interchangeably. However, the distinction is important to remember when setting up a billing policy for a new firm or training a new paralegal on time entry.
How do attorneys bill time?
The process follows a fixed sequence every time: the attorney completes a task, records the exact time spent, looks up the decimal on the increment chart, multiplies by the hourly rate, and logs the entry into the billing system or invoice.
Task performed → time recorded → converted to decimal → multiplied by hourly rate → added to invoice.
Skipping the conversion step and estimating the decimal is where billing errors start and where revenue quietly leaks.
Example: 18 minutes at $300/hr. Chart lookup: 18 minutes = 0.3. Entry: 0.3 × $300 = $90.
The Attorney Billing Increment Chart
The standard attorney billing increment chart below is the reference tool used across most law firms for time entry and invoice review. Each row represents a 6-minute band, and to find the range your task falls into, use the decimal in your invoice.
| Time spent (minutes) | Billable unit (hours) | At $300/hr |
| 1 – 6 min | 0.1 | $30 |
| 7 – 12 min | 0.2 | $60 |
| 13 – 18 min | 0.3 | $90 |
| 19 – 24 min | 0.4 | $120 |
| 25 – 30 min | 0.5 | $150 |
| 31 – 36 min | 0.6 | $180 |
| 37 – 42 min | 0.7 | $210 |
| 43 – 48 min | 0.8 | $240 |
| 49 – 54 min | 0.9 | $270 |
| 55 – 60 min | 1.0 | $300 |
Based on a $300/hr rate. Adjust the third column to your rate. The minute-to-decimal conversion stays the same regardless of rate.
Why do lawyers use 6-minute billing increments?
Six minutes is one-tenth of an hour. It is the smallest practical unit for legal billing.
Billing by the exact minute is too granular to track reliably across a full day of varied tasks. Billing in 15- or 30-minute increments is too aggressive, and shifts costs onto the client unfairly. Six-minute increments bring balance. It is precise enough to be fair and simple enough to calculate without software.
One thing practitioners get wrong is that every task within a band bills at the same decimal. A 7-minute call and a 12-minute call are both 0.2 hours. The increment does not scale within the band. It will round to the top of whichever range the time falls into. Understanding this prevents under-entry on short tasks and removes the temptation to estimate.
How to Use an Attorney Billing Chart Step-by-Step
The attorney billing chart is about converting real work into invoice-ready time without losing accuracy. Here is the exact process, with two worked examples: one simple task and one multi-hour task with partial minutes, which is where most billing errors actually occur.
Step 1
Record the exact time when you finish the task: Not at the end of the day. Note the minutes, not a rough estimate. The chart does the rounding; your job is to give it an accurate input.
Step 2
Look up the decimal on the increment chart. Find the row your minute count falls into and use the decimal in that row, and do not interpolate within the band.
Step 3
Multiply the decimal by your hourly rate. That figure is the billable value of the task.
Step 4
Log the entry with a descriptive note: What was done, why it mattered to the client, how long it took. In most small and mid-size firms, a paralegal or legal assistant reviews entries before the invoice goes out. A vague entry at this stage gets flagged, written down, or disputed.
Sample Attorney Billing Entry Descriptions: Good vs. Bad
A good billing entry answers three questions: what was done, why it mattered to the client, and how long it took. Bad billing entries invite client disputes, write-downs, and invoice delays because they cannot clearly justify the work done.
| Bad entry | Good entry |
| Attorney services: 0.5 | Drafted motion to compel discovery responses; reviewed opposing counsel correspondence — 0.5 |
| Phone call: 0.1 | Telephone conference with client regarding settlement offer and next steps — 0.1 |
| Research: 1.2 | Researched case law on statute of limitations in breach of fiduciary duty claims — 1.2 |
| Document review: 0.8 | Reviewed deposition transcript and prepared summary memo highlighting key inconsistencies — 0.8 |
Bad entries give clients a reason to dispute the invoice. A client who sees “attorney services: 0.5” has no way to verify what they are paying for. This kind of uncertainty is what triggers write-down requests.
Billable vs. Non-Billable Hours: What Attorneys Need to Know
Billable hours generate revenue directly. Non-billable hours support the firm’s operations but do not generate revenue. When attorneys spend most of their time on non-billable work, firm revenue is lost. This admin work could be done for under $50; they did it for $300/hour.
Billable hours include:
- Legal research on a client matter
- Drafting pleadings, motions, and contracts
- Court appearances and hearings
- Client communication related to case progress
- Document review and case preparation
Non-billable hours include:
- Adjustment of invoices and bills
- Scheduling and calendar management
- Timesheet entry and corrections
- Internal meetings and administrative coordination
- Marketing and business development activities
To save the attorneys’ time, many law firms are delegating non-billable tasks like invoicing, timesheet entry, and administrative coordination to virtual legal assistants. Every law firm should check the skills of a virtual assistant properly before hiring them.
The 3-question test: Is this task billable?
When an entry is borderline, run it through these three questions before logging it:
Q1: Was this work necessary to advance the client’s matter?
Q2: Did the client (explicitly or implicitly) authorize it?
Q3: Would a client reasonably expect to pay for it? If yes to all three
If the answer to all three is yes, the task is billable. If any answer is no, it belongs in your overhead column, not your invoice.
Can attorneys deduct charity work from taxes?
No. If an attorney bills at $300 per hour and donates ten hours of legal services to a nonprofit, they cannot claim $3,000 as a tax deduction. The IRS does not recognize the value of donated time or professional services as a charitable deduction.
Certain out-of-pocket expenses for pro bono work may qualify for deductions. They include filing fees, court costs, and travel expenses. Consult the advisor for specific situations.
Attorney Billing Best Practices
Good billing habits do more than improve invoices. They protect revenue, reduce client disputes, and make attorney time easy to recover.
Firms rarely lose hours because of misunderstanding the chart. They lose hours most of the time because they record them late or mix them with administrative work. Follow the practices given below for good billing:
Track in real time, not at the end of the day
Record time right after completing the tasks. The American Bar Association report shows that attorneys who log retroactively can lose 10-15% of billable time through missed entries and memory gaps.
Avoid block billing
Log each task as a separate entry rather than grouping multiple activities into one time block. Block billing makes invoices harder to audit, increases client disputes, and is explicitly prohibited in some jurisdictions and by certain court rules.
Delayed claims submission
Write every entry in a way that explains what was done, why it mattered, and how it supported the client’s matter. Keep in mind that vague descriptions often lead to write-downs because clients cannot know what they are paying for.
Set billing policies before work begins
Use an engagement letter that explains the hourly rates, billing increments, and invoice timing clearly. Lack of clarity leads to write-downs, and the firm spends more time resolving billing issues.
Delegate billing administration where appropriate
Attorneys should spend most of their time on legal work instead of administrative work. Because the more time they spend on non-billable work, the more the law firms lose revenue.
Many law firms now assign timesheet review, invoice preparation, and billing follow-ups to virtual paralegal assistants so attorneys can spend more time on billable work.
Never pad hours
Always record the actual time you work. Avoid unnecessary rounding off. Adding working time can cause client disputes and raise ethical concerns under professional responsibility rules in jurisdictions.
Common Billing Mistakes Attorneys Make
The hours that disappear from most timesheets are not from major oversights. They come from small, repeated habits:
Forgetting short tasks is the biggest mistake that many attorneys make. For example, an attorney spends 4 minutes on a call (client communication regarding case updates) and forgets to enter it into the billable work. It is 0.1 hour, and an attorney earning $300/hour loses $30.
Other common mistakes are billing for non-billable work, using one-word descriptions, and logging at the end of the week instead of entering data right after completing the tasks. This is where firms lose billable hours.
Stop Losing Billable Hours to Admin Work
A billing chart tells you what to record. It does not ensure anything actually gets recorded.
Telling what is not recorded isn’t the job description of the chart. Most of the attorneys who lose billable hours are not because they are confused about the chart.
The real problem is accountability. In small and mid-size firms, there is often no dedicated person owning the timekeeping system. So attorneys absorb it themselves, between client calls, at the end of the day, or not at all. That is when hours quietly disappear.
Firms that need broader coverage, across billing, admin, and case support, can explore virtual assistants for law firms as a flexible alternative to full-time hires.
Most Frequently Asked Questions
What is an attorney billing increment chart?
An attorney billing increment chart is a reference tool that attorneys use to convert exact minutes into standardized decimal fractions of an hour for invoicing.
How do you calculate attorney billing increments?
Attorney billing increments are calculated by converting the actual minutes worked into fractions of an hour and multiplying it with the hourly rate of an attorney. For example: 24 minutes = 0.4. At $250/hr, that’s $100.
Do all lawyers bill in 6-minute increments?
No, not all lawyers bill in 6-minute increments. Some of the law firms use 15-minute increments, but it overcharges the clients. 6-minute increments are the standard increments accepted in most of the firms.
What's the difference between billable and non-billable hours?
Billable hours are the time law firms can charge directly to clients, such as drafting legal documents, client meetings or calls, and court appearances and hearings.
Non-billable work is administrative work that cannot be charged to a client directly.
It includes internal team meetings, emails, scheduling, and business development.
How many billable hours do attorneys average per day?
The average attorney bills approximately 2.9 hours per workday, depending on their work area and seniority level.
