The hidden cost of billable hour leakage
Firms typically lose 2–5% of billable time to late, missing, or wrong entries. You already paid the salary. Almost everything you recover lands on the bottom line.
Billable hour leakage is easy to ignore because it never shows up as a line item. Margin comes in slightly worse than expected. Utilization runs slightly lower than planned. Partners wonder why revenue never quite matches capacity.
The mechanics are straightforward. A practitioner reconstructs their week on Friday from memory. They forget a two-hour client call. They charge the wrong code. They submit late and the billing team has already closed the period. Each instance is small. Across a fifty-person firm, the aggregate adds up.
Industry observations put typical leakage somewhere between 2% and 5% of billable capacity. The range is wide because most firms have never measured it precisely, which tells you something about how invisible the problem is.
Leakage is expensive because the cost side is already sunk. You paid the salary. You staffed the engagement. The work happened. Revenue that never gets captured is almost pure margin loss.
Fixing leakage usually comes down to removing friction. Timesheets that arrive pre-filled from what someone was scheduled on, with empty days flagged, change behavior because they change the default. Most people confirm and submit in under two minutes when the system does the reconstruction for them.
Firms that track time capture as revenue leakage tend to recover meaningful dollars without adding headcount. The math is straightforward. The hard part is measuring it consistently.