Block Billing: What It Is, Why It’s Expensive, and How to Stop It (Without Starting a War)
Most in-house legal teams have seen it before:
“Review documents, draft memo, call with client, analyze issues — 8.4 hours.”
Four tasks. One time entry. No way to tell what actually happened.
This is block billing, and it’s one of the most common reasons legal invoices become difficult to review and even harder to manage.
Block billing isn’t always malicious. Many firms use it simply because it’s easier to enter time that way. But for in-house teams trying to track spend, manage budgets, and understand where time is actually going, block billing creates real problems.
The good news is that you usually don’t need a major confrontation with outside counsel to fix it. A few clear expectations and consistent enforcement can go a long way.
What block billing actually means
Block billing occurs when multiple tasks are grouped together in a single time entry rather than recorded separately.
Instead of recording work like this:
Review draft agreement — 1.2 hours
Revise indemnification clause — 0.6 hours
Call with business team — 0.5 hours
You might see something like this instead:
Review agreement, revise provisions, call with business team — 2.3 hours
The total time may be perfectly reasonable. But once tasks are combined like this, it becomes difficult to evaluate:
• which tasks took the most time
• whether work was staffed appropriately
• whether the time spent was reasonable
• how similar work compares across matters or firms
For teams trying to bring structure and predictability to legal spend, that lack of visibility matters.
Why block billing makes spend harder to manage
1. You lose visibility into where time actually goes
When tasks are bundled together, you can’t easily see whether time was spent on research, drafting, internal discussions, or administrative work.
That makes it difficult to answer simple questions like:
• Why did this motion cost twice as much as the last one?
• Are we overpaying for research?
• Are partners doing work that associates could handle?
Without that visibility, budgeting and forecasting become much harder.
2. It makes invoice review much more difficult
Block billing forces reviewers to evaluate time entries without enough context.
For example:
Draft discovery requests, revise responses, review documents — 6.5 hours
Was most of the time spent drafting? Reviewing documents? Researching the law?
There’s no way to know.
This is why many organizations include “no block billing” language in their billing guidelines.
3. It weakens spend analysis
Many legal teams now want to answer questions like:
• How much do we typically spend on contract review?
• What does an average employment matter cost?
• Which firms are most efficient on similar work?
Block billing makes those insights much harder to generate because tasks aren’t clearly separated.
In other words, block billing doesn’t just affect invoice review, it affects the quality of your legal spend data.
Why firms use block billing
It’s worth recognizing that block billing usually isn’t an attempt to hide work.
More often it happens because:
• time entry systems make separate entries cumbersome
• lawyers reconstruct time at the end of the day
• firms assume clients don’t need detailed breakdowns
• lawyers were simply trained to record time this way
The good news is that most firms adapt quickly when expectations are clear.
How to address block billing without creating friction
The goal isn’t perfect invoices. The goal is reasonable transparency.
Here are a few approaches that tend to work well.
1. Set expectations in your billing guidelines
The simplest solution is often the most effective.
For example:
Time entries should describe a single task. Multiple tasks should be recorded separately. Entries combining multiple tasks may be reduced.
Most firms are already familiar with language like this.
The key is consistency. If the rule exists but is never enforced, it quickly gets ignored.
2. Focus on larger entries first
You don’t need to challenge every small time entry.
Instead, focus on entries that involve:
• several hours of work
• strategically important tasks
• high-value matters
Even modest improvements in large entries dramatically improve invoice visibility.
3. Ask for clarification before requesting adjustments
Often the easiest approach is simply asking for more detail.
For example:
“Could you provide a bit more detail on the tasks included in this entry so we can better understand how the time was allocated?”
Many firms will respond quickly without any pushback.
4. Apply a simple adjustment rule when necessary
Some organizations adopt a standard approach such as:
• reducing block-billed entries by 10–20%, or
• requesting revised time entries before approving the invoice.
The specific rule matters less than the consistency. Once firms know the expectation, billing practices usually improve.
A practical example
Imagine two invoices for similar work.
Invoice A (block billed)
Review agreement, revise provisions, conference with team, research issue — 5.6 hours
At a glance, it’s impossible to tell:
• which task consumed the most time
• whether research dominated the work
• whether senior lawyers handled routine tasks
Invoice B (tasks separated)
Review agreement — 1.5 hours
Revise indemnification clause — 1.0 hour
Research regulatory issue — 2.2 hours
Internal conference — 0.9 hours
Immediately, the picture becomes clearer:
• research consumed the largest portion of time
• internal conferencing took nearly an hour
• future budgets can be estimated more accurately
Across dozens or hundreds of invoices, this kind of clarity makes a significant difference.
The bigger goal: better data, not just cleaner invoices
It’s tempting to think of block billing as just an invoice formatting issue.
But the real impact is on data quality.
When time entries are clear and consistent, legal teams can:
• understand how work is actually being performed
• compare firms and staffing approaches
• budget matters more accurately
• identify opportunities to reduce cost
Improving billing clarity tends to pay dividends far beyond a single invoice review.
A simple place to start
If your organization hasn’t addressed block billing yet, a simple starting point is:
Add a short block-billing clause to your billing guidelines
Ask for clarification when large entries appear
Track patterns across firms over time
Most firms adapt quickly once expectations are clear.
And over time, those small improvements make invoice review faster, budgets more accurate, and legal spend easier to manage.
