Definition · 2026
What is a margin autopsy?
A margin autopsy is a client-level profit-leak analysis for agencies. It reconciles three record sets that normally never meet (time logs and budgets from the project tool, invoices from the accounting tool, and ad spend from the media platforms) and prices every leak it finds: unbilled hours, scope creep, overdue invoices, and wasted ad spend. The output is a single figure of estimated leakage for that client, broken into who owns each loss and what to do about it.
The term comes from the post-mortem idea: instead of asking "how is this client doing" (a health check), a margin autopsy asks "where exactly did the money die". LoomDeck coined and operationalised the method as a guided wizard; the concept applies to any agency willing to join its delivery, finance, and media records.
The four leak types
1. Unbilled hours
Work logged in the project tool that never reached an invoice. Ignition's 2025 Agency and Cash Flow Report found 78% of agencies rarely or only sometimes bill for out-of-scope work, which makes this the most common leak. Owner: the agency; fix internally with weekly reconciliation and change orders.
2. Scope creep
Hours delivered beyond the agreed budget or retainer. PMI's Pulse of the Profession research put scope creep at 52% of projects, with an average budget overrun near 27% once it hits. Owner: the agency; fix with a re-scope conversation backed by the logged evidence.
3. Overdue receivables
Approved invoices the client has not paid. QuickBooks' 2025 US small business research found 56% of small businesses are owed money on unpaid invoices at any given time. Owner: the client; fix with escalation and, where terms allow, a delivery pause.
4. Wasted media spend
Ad sets or campaigns running below the agreed return floor. Benchmark ROAS medians by category (Triple Whale, WordStream) make the floor objective rather than a matter of opinion. Owner: the client's budget, on the agency's watch; fix by pausing and rebuilding the underperforming ad sets.
Sources for the figures above are listed with publisher and year on the agency profitability benchmarks page.
A worked example
Take a retainer client billing a fixed monthly fee. The autopsy joins the records and finds: 18 hours logged but never invoiced, a project 24 hours over its monthly budget, one approved invoice 30 days past due, and one prospecting ad set running below the return floor. Priced at the agency's blended rate, the report totals the leakage and splits it three ways: margin the agency bleeds internally, money the client owes the agency, and client media budget being wasted. Three different owners, three different conversations, one report.
You can run this exact analysis on seeded agency data right now: the live margin autopsy wizard on the LoomDeck landing page produces a downloadable leak report, and the live demo shows the full operating deck around it. To sanity-check a single retainer against these leak types by hand, the free agency margin calculator runs the same math with four numbers you already know.
Frequently asked
What is a margin autopsy?
A margin autopsy is a structured, client-level analysis that reconciles an agency's delivery records (time logs and budgets), finance records (invoices and payments), and media records (ad spend and returns) to find where a specific client relationship is leaking profit. It prices each leak in money and totals them, so the agency knows exactly what the client relationship is costing versus what it bills.
What does a margin autopsy find that a P&L does not?
A profit and loss statement shows that margin dropped; it cannot show why, or on which client. A margin autopsy works at the level where leaks actually happen: hours logged in the project tool that never reached an invoice, budgets quietly overrun, invoices sitting overdue, and ad sets spending below their return floor. Each finding carries its own evidence line and a priced impact.
What are the four leak types a margin autopsy finds?
One: unbilled hours, work logged in the project tool that never made it onto an invoice. Two: scope creep, hours delivered beyond the agreed budget or retainer. Three: overdue receivables, approved invoices the client has not paid. Four: wasted media spend, ad sets or campaigns running below the agreed return threshold. The first two bleed the agency's own margin, the third is money the client owes, and the fourth is the client's budget being wasted on the agency's watch.
What data does a margin autopsy need?
Three record sets, joined per client: time and budget data from the project management tool (for example ClickUp), invoice status from the accounting tool (for example Xero), and spend with returns from the ad platforms (for example Meta and Google Ads). CRM and communication data (HubSpot, Slack) add context such as pipeline value and channel activity.
How often should an agency run a margin autopsy?
Monthly per active retainer is the practical rhythm: monthly leaks compound quietly, and published research suggests most agencies under-bill scope-creep work as a matter of routine rather than exception. Quarterly is the minimum for a retainer book of any size.
Published July 2026 by LoomDeck, the agency operating system by NexBDM (Pty) Ltd. Cite this page as: LoomDeck, “What is a margin autopsy?”, loomdeck.io/margin-autopsy, 2026.