Block Billing: Why Bills Get Cut and How to Fix It
Block billing is the practice of lumping several distinct tasks into a single time entry with one combined duration. It reads fine to the lawyer who wrote it and badly to everyone downstream: the billing partner, the client's e-billing software, the reviewer deciding what actually gets paid. That gap between how it reads on your side and how it reads on theirs is why block-billed time gets trimmed so often.
A blocked entry, and the same work unbundled
Take one entry on a litigation matter, 4.5 hours:
"Review discovery responses; draft motion to compel; call with client; revise case strategy memo."
Everything on that line probably happened, and 4.5 hours may be completely fair. The trouble is that nobody reading it can check. Four tasks are welded into one number.
Here's the same afternoon, unbundled:
Review opposing party's discovery responses: 1.4
Draft motion to compel: 2.0
Call with client re: discovery deficiencies: 0.4
Revise case strategy memo: 0.7
Same 4.5 hours, same work. Now a reviewer can form a judgment on each line: two hours on the motion looks reasonable, the four-tenths client call clearly wasn't padded. The bill goes from "trust me" to a record of exactly what got done, and that version gets paid without an argument.
Why block billing gets bills cut
The core issue is evaluability. A reviewer's job is to decide whether the time on each task was reasonable, and a blocked entry makes that impossible by design. When four tasks share one duration, you can't tell whether the client call ran six minutes or ninety, so the entire entry becomes suspect.
That's why block billing shows up by name in the rules that govern legal invoices. Many corporate clients bar it in their outside counsel guidelines, and e-billing platforms flag or reject entries that fold several task codes into one line. When the per-task detail isn't there to check, trimming the line is the safe move, and reviewers take it.
The work was still done. What failed was the format: it made otherwise reasonable time impossible to defend, and the reviewer resolved that doubt in their own favor.
Why lawyers block bill anyway
Almost nobody block bills on purpose. It's what end-of-week reconstruction produces.
Picture the Thursday-night catch-up on Tuesday's billable hours. You know you spent the afternoon on the Henley matter. You know it involved discovery, a motion, a client call, and some strategy work. What you don't have, three days later, is the boundary between those tasks or the minutes each one took. So you write the one honest thing you can still reconstruct: a single entry for the block of time you know you worked. That blocked entry is the true shape of a memory that blurred before it ever reached the billing screen.
The standard advice is to bill contemporaneously and split every task into its own line as you go. It's correct, and it asks for a stopwatch discipline that almost nobody sustains through a real day of interruptions. A timer granular enough to prevent block billing is a timer nobody actually keeps. The behavior survives because the tools meant to fix it depend on the exact willpower that a busy billing week has already spent.
Fixing it without a stopwatch
The way out is to stop rebuilding the day from memory and start recording it while it happens. If each task is captured as you do it, task-level entries become the default output instead of something you assemble on Thursday night.
That's the approach we take with Ajax. It runs in the background on your computer and reads the work on screen roughly every 30 seconds, alongside your email, calendar, and phone activity. Because each call, drafting session, and document review was recorded as its own activity with its own start and stop, the day arrives already separated into discrete tasks. Ajax drafts each one with a narrative in your voice (there are worked examples of what those entries look like if you want to see the format), applies your task codes when a client requires them, and hands the day back to you. You edit anything that's off and release it into your billing system.
A lawyer still reviews and approves every entry before it goes anywhere, which is what keeps the bill defensible. What changes is that the blocked entry stops being the path of least resistance. When four tasks are already sitting there as four separate lines, welding them back into one takes extra effort, so most people simply don't.
One limit worth knowing: capture runs on the desktop, so a traditional desk phone or a call from your personal cell isn't recorded directly. Calendar entries and on-screen context still catch much of that time, but it's worth knowing where the edges are.
FAQ
What is block billing?
Block billing is recording several separate tasks as one time entry with a single combined duration, instead of giving each task its own line and its own time.
Do e-billing systems catch block billing?
Usually, yes. Corporate clients' e-billing platforms parse each invoice line against the outside counsel guidelines on the matter, and entries that bundle several tasks into one duration get flagged or kicked back automatically, before a human reviewer ever weighs in. That's why firms working under guidelines treat unbundled, task-level entries as the default format.
Why do clients reject block-billed entries?
Because they can't verify them. A client paying by the hour needs to see that the time on each task was reasonable, and a bundled entry hides the per-task detail their e-billing system and outside counsel guidelines require. Cutting or rejecting the entry is the safe move when that detail isn't there.
How do you avoid block billing without living in timers?
Capture the work as it happens instead of reconstructing it at the end of the week. Passive timekeeping tools record each task as its own activity while you work, so entries come out already split by task, each with its own duration, without anyone starting a stopwatch.
See what your own day looks like when it arrives already broken out task by task. Book a demo and we'll run it on real work.
