Count the Cash You Can't Spend
Most specialty manufacturers can quote their revenue to the dollar and have no real idea how much of their own money they can't touch. None of it is in the bank. It's sitting in raw stock, in half-finished work, in finished goods waiting on a customer's release date, and bolted to the floor as machinery you paid for years ago.
That gap has a name. The cash conversion cycle measures how many days your money stays trapped between paying your suppliers and collecting from your customers. The Hackett Group's 2025 working capital study found that small U.S. companies, those under $300 million in revenue, ran a cash conversion cycle of about 120 days in 2024. The largest 1,000 public companies ran roughly 37. So the small manufacturer waits 4 months to turn a dollar of input back into a dollar of cash, while the big player waits 5 weeks. Neither the economy nor the customers explain that gap. The big player simply has far more room to breathe.
Inventory is not an asset you can spend
On the balance sheet, inventory sits in the asset column, and that placement fools people. Inventory you can't sell this week or borrow against at full value has stopped behaving like an asset. It's cash with the liquidity drained out.
The Census Bureau's manufacturing data has the total-manufacturing inventories-to-shipments ratio sitting around 1.5, which means the sector carries roughly 1.5 months of shipments frozen in stock at any given time. For a specialty shop the number is often worse, because the whole reason customers come to you is that you make things they can't get off a shelf, and that means custom material, long-lead components, and safety stock you hold so you never have to tell your best account you can't deliver.
The Hackett Group has estimated that something on the order of $1.7 trillion in working capital is tied up in excess inventory globally, a lot of it held simply because companies don't have clean enough demand data to carry less without getting scared. That last part is the part you can actually fix. Most of the excess in a small manufacturer isn't strategy. It's fog. You hold more because you can't see clearly, and the safety stock is really insurance against your own reporting.
The machine you own twice
Equipment is the other place the money goes to sleep. You buy a $400,000 machine, you finance it, and now 2 things are true at once. The cash is gone, and you are paying interest on the fact that it's gone. If that machine runs one shift a day, you own an asset that spends most of its life idle while you service the debt that bought it around the clock.
Manufacturers rarely think of a half-used machine as trapped cash, but that's exactly what it is. The capital is committed, the return only shows up during the hours the spindle is actually turning, and every idle hour is financing cost with no output on the other side. Utilization is the interest rate you are really earning on the biggest checks you write, even though nobody records it that way.
What to count before you count profit
Start by measuring the cycle instead of guessing at it. Take your days of inventory, add the days your customers take to pay, subtract the days you take to pay suppliers, and you have your number. Run it. Most owners have never seen it, and the first time they do, the reaction is usually silence.
Then attack the 3 pieces in order of how fast they move. Payables are the quickest lever and the one you already control. Receivables are next, and the tool is boring and effective: shorter terms on new work, deposits on custom runs, and someone whose actual job is collecting, not "the office handles it." Inventory is the slowest to move and the biggest prize, and it moves only when you can see demand well enough to hold less without flinching.
None of this shows up in your profit and loss, which is why it stays invisible for years. You can run a profitable business that is quietly starving for cash, because the profit is real and locked inside a machine and a warehouse at the same time. The owners who grow through a tight market are usually not the ones with the best margin. They're the ones who figured out how many days their money was asleep and went and woke it up.