The working capital cycle: why the line never zeroes
Inventory becomes receivables becomes cash, slower than the bills come due. The operating line lives in the gap.
The concept
The cash conversion cycle counts the days: days inventory sits, plus days receivables wait, minus days the company takes to pay its own suppliers. A manufacturer with 60 days of inventory, 45 days of receivables and 30 days of payables funds 75 days of operations out of pocket. Costed at the balances that build them — receivable days against daily sales, inventory and payable days against daily cost of sales — those 75 days are the gap the operating line has to carry.
Annual statements photograph the cycle at its calmest. A seasonal Canadian borrower — a farm supplier before seeding, a tourism operator before the season — shows low inventory and paid-down lines at year-end. The peak sits months away, invisible to the fiscal statements. The line has to be sized on the monthly build, which is why the file asks for interim figures the borrower may have to produce for the first time.
Growth is the quiet consumer of the cycle. A borrower whose sales rise twenty percent needs roughly twenty percent more inventory and receivables before the first extra dollar of profit arrives. Profitable companies overdraw their lines for exactly this reason, and the fix is structure — more term or equity money in the permanent part of the cycle — not a bigger line and a prayer.
What a lender asks of it
- When does the line peak
- Ask for the monthly borrowing history, not the December statement. The peak month sets the size; the year-end sets the story.
- Are the receivables real
- The aging answers it: concentration in one customer, invoices past the terms, receivables from related parties. A margined line is only as good as the list under it.
- Does the inventory turn
- Days inventory rising while sales flatten means the cycle is funding obsolescence, not operations.
- Who is funding whom
- Stretched payables look like free financing until a supplier cuts terms. The cycle question is whether the gap is structural or bought on borrowed goodwill.
Where files get it wrong
- Sizing the line off the fiscal statements — the year-end is the low-water mark, not the need.
- Funding the permanent part of the cycle with a demand line, then blaming the borrower when the line never clears.
- Reading margin usage as cash flow — the borrower may be inside the limit and outside the collateral at once.
- Treating a profitable borrower as a safe line. Profit is a slow payer; growth spends it before it arrives.
Training that covers it
- CA-201
- Cash flow II: forecasts, working capital and sensitivity — the module built on this exact cycle, including the seasonal case.
- CA-104
- Repayment capacity I ties the cycle to the line: what the margin funds versus what term debt should carry.
- The capstone case
- Excavation Petitcodiac is a seasonal borrower; the L1 capstone makes the cycle the exam, not the example.
What is missing today
Working capital is taught inside the cash-flow modules, which are specified and not yet delivered.