Most finance teams assume their close is slow because the work is genuinely hard. Usually it’s slow because it’s full of waste — and not the kind that ever shows up on a budget line. Lean has a name for all of it, and a mnemonic that lets you walk any process and point at it: TIM WOODS. Point it at a monthly close and the leaks light up like a thermal camera.
The frame Toyota built
Taiichi Ohno, the engineer who built the Toyota Production System, cataloged seven categories of muda — waste — that add cost without adding value. Western adopters later added an eighth, Skills, for the human talent a process leaves on the table. The eight spell TIM WOODS: Transport, Inventory, Motion, Waiting, Overproduction, Overprocessing, Defects, Skills.
Ohno described his entire job in one sentence: “All we are doing is looking at the timeline, from the moment the customer gives us an order to the point when we collect the cash, and we are reducing that timeline by removing the non-value-added wastes.” Swap “order” for “period-end” and you have the monthly close. The output a controller owes is a clean, decision-ready set of books; everything between period-end and that deliverable is either value or waste.
Here is the number that should bother you. A disciplined lower-middle-market close lands in 4–5 business days. The typical one runs 10–18. That gap is almost never the actual accounting — debits and credits don’t take two weeks. The gap is waste, and the biggest single contributor is usually Waiting: books sitting idle while they wait on a bank feed, a client document, or a reviewer who’s in meetings until Thursday.
The eight, walked through a close
Once you know the categories, you can’t un-see them:
- Transport — the same trial balance emailed from bookkeeper to controller to outside CPA, re-exported from one system and re-imported into another, each handoff a chance to drop or stale a number.
- Inventory — the backlog that piles up because no one works it down: uncategorized transactions, unbilled WIP, unreconciled items carried month to month. Like warehouse inventory, it ties up cash and hides problems inside the pile.
- Motion — the human version of Transport. Hunting for a document across email, Drive, and three portals; logging into six systems; re-keying the same figure into a workpaper because nothing is connected.
- Waiting — the close stalls because a bank statement hasn’t posted, a client hasn’t sent the loan schedule, or an approval is sitting in someone’s inbox. Pure idle time, and usually the largest slice of the calendar.
- Overproduction — the 40-tab package built every month because it was built last month, most of it read by no one. Producing more reporting, earlier, than any decision requires.
- Overprocessing — re-reconciling accounts that already tied, three layers of review on an immaterial account, formatting a deck to the pixel before anyone has decided it’s even the right deck.
- Defects — the expensive one. A misclassification, a legacy adjusting entry, a cutoff error. Each defect spawns rework now and, worse, surfaces later in a Quality of Earnings review where it costs far more than a correction — it costs credibility.
- Skills — the quietest waste. The bookkeeper who knows exactly why that accrual exists, never asked. Redesigning the close around the org chart instead of around the person who actually knows where the bodies are buried.
Notice these compound. Defects create Inventory (a backlog of fixes). Inventory creates Motion (hunting through it) and Waiting (the reviewer blocked behind it). Attack one and two others shrink.
What this means for diligence
If you’re underwriting a business, the close is a free diagnostic of how the whole finance function is run — you just have to read it through this lens. A sprawling, slow close is rarely a staffing problem. It’s a muda problem, and muda is fixable without hiring.
So ask the CFO three questions. How many business days does the close take, and how much of that is work versus waiting? What’s carried in the uncategorized and unreconciled buckets right now — and how long has it sat? And when something’s wrong, does it get fixed at the root or patched with a top-side entry every month? The answers tell you whether you’re buying a finance function or a backlog.
Good looks like a close that shrinks over time, a short list of known exceptions worked down each month, and corrections that happen once. Bad looks like a close that takes exactly as long as it did a year ago, a growing pile no one owns, and the same adjusting entry reappearing every period because nobody fixed the thing that caused it. The first is a business you can model. The second is one that will keep surprising you in the data room.
This is the discipline we apply to every Kaizen CFO engagement. Talk to sales →