A manufacturer buys material, converts it, ships it, and waits to be paid. Money leaves at the front of that sequence and returns at the back, and the distance between the two is the reason growing shops run tight while their income statements look excellent. Profit and cash are not the same thing, and in manufacturing they diverge more sharply than in almost any other business, because production consumes cash before it produces anything sellable.
The useful thing about this problem is that it is measurable to the day. The cash conversion cycle turns the whole sequence into a single number, and once you have that number you can see exactly how much working capital a given level of sales requires and what happens to that requirement if sales grow 30 percent. This article covers how to compute it, how lenders finance it, and which levers actually move it.
The cycle, in days
Three components, one subtraction. Days inventory outstanding measures how long material sits as raw stock, work in process and finished goods before it ships. Days sales outstanding measures how long the invoice waits after that. Days payable outstanding measures how long your suppliers finance you. The cash conversion cycle is the first two added together, minus the third.
Every day in that number is money. If you know your daily cost of sales, each day of cycle is roughly that much cash locked in the business permanently, not once, but continuously, for as long as you operate at that volume.
That last sentence is the whole point. Growth in a manufacturing business consumes cash proportionally to the cycle. A shop with an 84-day cycle needs to fund roughly 23 percent of every incremental sales dollar before it sees any of it. This is why an order win can feel like a crisis, and why the right response is often a facility rather than a spending cut.
Why manufacturing inventory is a harder financing problem than retail
Retail inventory is one thing in one state: sellable goods. Manufacturing inventory is three things in three states, and lenders treat them very differently.
| Category | Why it is valued that way | Typical treatment |
|---|---|---|
| Raw material: commodity bar, sheet, resin | Fungible, has a published market, resells without conversion | Advanced against, often at the highest inventory rate |
| Raw material: custom or customer-specific | No market outside one buyer | Discounted heavily or excluded |
| Work in process | Half-finished parts have almost no liquidation value | Commonly ineligible entirely |
| Finished goods: standard product | Sellable as-is to more than one buyer | Advanced against at a moderate rate |
| Finished goods: single-customer parts | Value depends on one buyer accepting them | Discounted, sometimes excluded |
| Slow-moving and obsolete | Carrying value overstates recoverable value | Excluded, and its presence invites scrutiny of the rest |
The practical consequence is that a job shop with $1.9M of inventory on the balance sheet may have far less eligible collateral than that figure implies, because most of it is WIP and customer-specific raw stock. Knowing your eligible number before you ask prevents an unpleasant surprise when the borrowing base certificate comes back.
Receivables are usually the better collateral
For most manufacturers the receivable is the stronger asset, because it is an obligation from a third party rather than a pile of metal. Advance rates on eligible receivables run well above inventory rates, and the eligibility rules are more predictable.
The rules that trip shops up: invoices past a stated aging limit generally fall out; balances from one customer above a concentration cap fall out above the cap; foreign accounts often fall out unless insured; contra accounts where you also buy from the customer are netted; progress billings and unbilled retainage may be excluded; and invoices with disputes or credits attached are removed. A shop with $1.6M of gross receivables can easily present $1.15M of eligible ones, and the difference determines availability.
Material price volatility and the purchasing decision
Metals, resins and electronic components move on cycles that have nothing to do with your order book, and mill minimums force shops to buy in quantities the schedule does not need yet. Buying ahead on a rising market can be correct. It is also a cash decision and should be made as one: does the expected price saving exceed the cost of carrying the material plus the opportunity cost of the cash for the holding period? A 6 percent saving on material that sits seven months is thinner than it looks once carrying cost, handling and obsolescence risk are counted.
The other side of volatility is pricing. Fixed-price contracts with no material escalation clause transfer commodity risk onto the shop, and a run in input prices can turn a profitable program into a loss with nothing operational changing. Escalation language, index-based adjustment or shorter price validity periods are the defenses: quoting decisions, not financing decisions.
How the cycle gets financed
A revolving line of credit
The natural fit, because it flexes with the cycle. You draw to buy material, repay when the invoice collects, and pay for what you use. Limits may be set against a borrowing base of eligible receivables and inventory, or on cash flow for stronger balance sheets. The discipline that matters is cleaning it down periodically rather than letting it become permanent debt disguised as a revolver.
Receivable-based facilities
Availability tracks the receivable ledger directly. Useful where inventory is mostly ineligible and customers are strong, and during growth phases when receivables rise faster than the balance sheet supports conventional limits. Reporting is heavier: expect regular borrowing base certificates and agings.
Supplier terms
The cheapest financing available and the most often neglected. Moving a key supplier from net 30 to net 60 removes 30 days from the cycle at zero interest cost, and it requires the same thing a lender wants: clean payment history and financial credibility.
Customer deposits and progress payments
On long-lead or high-value work, a deposit against material moves the cycle in the same direction at no cost. Buyers say no more often than yes, but the conversation is free, and on custom tooling or first articles it is common enough to ask every time.
Levers that actually move the number
| Lever | What it moves | Typical time to show up |
|---|---|---|
| Invoice on ship date, not on a monthly cycle | DSO | One billing cycle |
| Collections calls at day 5 past terms, not day 30 | DSO | Thirty to sixty days |
| Stop paying suppliers early; pay on terms | DPO | One payables cycle |
| Liquidate obsolete and slow-moving stock | DIO and eligible collateral | One to two quarters |
| Reduce lot sizes and setup times on repeat parts | DIO through less WIP | One to two quarters |
| Renegotiate supplier terms | DPO | A quarter or more |
| Negotiate customer terms downward | DSO | Contract renewal cycles |
Note the pattern: the fastest levers are process, not negotiation. Most shops can take a week or more out of the cycle within a single month purely by billing and collecting on schedule, and that improvement shows up in the bank statements a lender will read.
The quarterly working capital review
Run this every quarter
- Compute DIO, DSO and DPO from the last twelve months and chart them against the prior four quarters.
- Convert the cycle to dollars using daily cost of sales, and compare it to your current facility limit.
- Age the receivable ledger and list every invoice past terms with the reason it is late.
- Apply your lender's eligibility rules to the ledger and compute your own eligible receivable figure.
- Age raw material and finished goods by category, and flag anything untouched for over six months.
- List the top ten suppliers with current terms and identify the two worth renegotiating.
- Check whether invoices are issuing on ship date and measure the average lag if they are not.
- Model the cycle at 25 percent higher revenue and confirm the facility covers the requirement.
How much of a line of credit should a manufacturer carry?
A common starting frame is enough availability to fund the cash conversion cycle at planned peak revenue, with headroom for a material price move. Compute the cycle in dollars, add margin for seasonality and growth, and compare it to what your coverage supports. Actual limits are set by the lender against a borrowing base or cash flow and vary by file.
Why is my work in process not counted as collateral?
Because a half-machined casting has almost no value to anyone but you. Liquidation analysis assumes the business stops, and unfinished parts in that scenario are usually worth scrap. It is not a judgment about your operation, only about what the asset would fetch if it ever had to be sold.
Should I buy raw material ahead when prices are rising?
Only when the expected saving beats carrying cost plus the value of keeping the cash flexible, and only in quantities the schedule will genuinely consume. Buying ahead is a position on a commodity price, which is a different business from making parts. Size it so a wrong call is uncomfortable rather than dangerous.
Does financing receivables hurt my ability to get bank credit later?
Not inherently, but structure and disclosure matter. A receivable facility creates a lien on the asset a future lender may want, so the transition has to be planned rather than improvised. What damages a future file more is using expensive short-term money as permanent capital and letting coverage deteriorate.
My customers all demand net 60. What can I actually do?
Three things that work: invoice on the ship date so the clock starts immediately, chase past-due invoices at day five rather than day thirty, and push your own payables out to match. If the terms genuinely cannot move, the cycle has to be financed: a legitimate and well-understood use of a revolving facility.
How do lenders verify inventory?
Typically through a field examination: physical counts, reconciliation to your perpetual system, testing of costing methods and review of aging. Frequency depends on facility size and structure. A shop with an accurate perpetual system and clean cycle counts gets through quickly; one with an annual count and no reconciliation does not.
Where to start
Compute the three day-counts and convert the cycle to dollars. That single figure tells you how much cash your current volume permanently requires, and multiplying it by your growth plan tells you how much more the next year will require.
Then fix billing timing and collections discipline before you go looking for a facility. Those two changes cost nothing, show up in one cycle, and improve both the number you need to finance and the bank statements a lender will use to decide whether to finance it.
Qualified Commercial Underwriting Desk
Credit and capital markets
The Qualified Commercial underwriting desk reviews commercial real estate, dealer and Main Street files daily. The Academy is written from that work (how files are actually read, priced and declined) rather than from a rate sheet.
Educational content only. Nothing here is a commitment to lend, an offer of credit, or tax, legal or accounting advice. Program terms, timelines and thresholds vary by lender, file and market conditions, and any figures shown are illustrative.