Ask a managing partner where margin goes, and most will point to pricing. In practice, the bigger leak is quieter: work-in-progress that grows faster than the invoice, discovered only at month-end when the write-off decision is already made for you.
The three places margin leaks
- Scope creep without a trigger — extra hours land in WIP with no alert that the engagement has passed its budget.
- Stale reporting — when WIP is reviewed monthly, a fixed-fee engagement can run 30% over before anyone sees it.
- Realization blind spots — firms track hours but not the effective rate, so discounting happens silently at billing time.
You can't fix a margin problem you find 45 days after the work was done. Real-time WIP turns write-offs into conversations.
What real-time WIP changes
When every engagement shows budget versus actual as hours are logged, partners can intervene while there's still time to act: re-scope the work, talk to the client about a change order, or reassign staff. Practice Ledger surfaces unbilled amounts, aging and effective rates by client on one screen, so the month-end review becomes a confirmation instead of an autopsy.
The firms that protect margin aren't working fewer hours — they're seeing the numbers early enough to do something about them.