Working Capital and the Cash Conversion Cycle
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In short
Working capital is the money tied up in running the business day to day, and the reason it belongs in a corporate finance pillar rather than an accounting one is that it is financing.
Scope. This article treats working capital as a financing decision and builds the cash conversion cycle from its components. What each underlying line is and how it behaves belongs to Pillar 24, which this article links to rather than repeats. No threshold is given for any of these measures and no cycle length is described as good or bad. Worked figures are the portal's fictional company.
Every day a customer takes to pay is a day the company has lent them money. Every day of inventory is a day of capital sitting on a shelf. Every day the company takes to pay a supplier is a day the supplier has financed it.
Nobody signs anything, no interest rate is quoted, and the amounts are frequently larger than the company's borrowings. That is what makes it worth measuring directly rather than reading off a balance sheet as a category.
The three components
Using Wexford Instruments, and following the Pillar 24 convention that working-capital days use closing balances.
| Component | Computation | Days |
|---|---|---|
| Days sales outstanding | receivables 150.0 / revenue 1,000.0 × 365 | 54.8 |
| Days inventory outstanding | inventory 130.0 / cost of sales 600.0 × 365 | 79.1 |
| Days payable outstanding | payables 90.0 / cost of sales 600.0 × 365 | 54.8 |
| Cash conversion cycle | DSO plus DIO less DPO | 79.1 |
Worked example
Worked example — a coincidence in the canonical figures that makes the structure visible. Days sales outstanding and days payable outstanding are identical at 54.8, because receivables are exactly 15.0% of revenue and payables are exactly 15.0% of cost of sales. They cancel, so the cash conversion cycle equals days inventory outstanding exactly: 79.1 days. That is an accident of this company's figures and not a general rule — but it makes the mechanics unusually legible. The cycle is the period between paying for something and being paid for it, and here the whole of it is inventory: the customer collection period and the supplier payment period offset each other completely, so what the company is financing is the shelf. MarketClue attaches no threshold to any of these figures and does not describe 79.1 days as long or short; whether it is either depends on the industry, and this company is fictional.
What one day is worth
The value of a day differs by component, and the difference is not decorative. A day of receivables is measured against revenue; a day of inventory or payables is measured against cost of sales.
| Component | One day equals | Amount |
|---|---|---|
| Days sales outstanding | revenue 1,000.0 / 365 | 2.74 |
| Days inventory or days payable | cost of sales 600.0 / 365 | 1.64 |
So a day taken out of collections releases 2.74 of cash, while a day taken out of inventory releases 1.64. A reader comparing improvements across components without noticing the different denominators will overstate the inventory gains relative to the receivables gains by about two-thirds.
Why growth consumes cash
Working capital scales with the business, so a growing company funds a growing balance. The canonical company's operating working capital — receivables plus inventory less payables and deferred revenue — went from 106.0 to 120.0, an increase of 14.0, which is exactly the amount the cash-flow statement shows working capital consuming.
The increase of 13.2% sits just below revenue growth of 13.6%, and operating working capital held at 12.0% of revenue in both years. The balance grew because the business grew, not because anything deteriorated.
Worked example — the decomposition, and the one item that runs the other way. The 14.0 consumed breaks into receivables −22.0, inventory −12.0, payables +8.0 and deferred revenue +12.0. Two of those are outflows and two are inflows, and the inflows are both forms of somebody else financing the company: a supplier waiting to be paid, and a customer paying in advance. Deferred revenue is the item most often filed mentally under liabilities and forgotten — it is cash the company already holds for work not yet done, and it grew 20.7% against revenue growth of 13.6%. A company with enough deferred revenue can run a negative cycle, financed entirely by its customers. Whether growing deferred revenue reflects favourable terms or a shift in what is being sold is not determinable from the balance and belongs to the revenue note, which is why the article on footnotes matters here.
Why this is a financing decision rather than an operational detail
Every day of the cycle is capital the company must fund from somewhere — its own cash, its borrowings, or its shareholders. A company that shortens its cycle releases capital without earning anything, and a company that lengthens it must find the funding.
The reason this is a decision and not an outcome is that all three components are negotiated. Collection terms are set in contracts. Inventory levels reflect a choice about availability against carrying cost. Payment terms are agreed with suppliers, and stretching them transfers financing from the company to businesses that may be smaller and fund themselves more expensively.
That last point is the one worth carrying. A cycle improvement achieved by paying suppliers later has not created anything; it has moved a financing requirement down the chain. The measure improves either way, which is precisely why the measure alone does not tell a reader what happened.
Frequently asked
8 questions
What is the cash conversion cycle?
Days sales outstanding plus days inventory outstanding less days payable outstanding — the period between paying for something and being paid for it. In the worked example it is 79.1 days.
Why do the three components use different denominators?
Because receivables arise from sales and are measured against revenue, while inventory and payables arise from purchases and are measured against cost of sales. One day of receivables is worth 2.74 here; one day of inventory or payables is worth 1.64.
Why does the cycle equal days inventory in the worked example?
Because receivables are exactly 15.0% of revenue and payables exactly 15.0% of cost of sales, so days sales outstanding and days payable outstanding are both 54.8 and cancel. That is an accident of these figures rather than a general rule, and it makes the structure unusually legible.
Why does growth consume cash?
Because working capital scales with the business. Operating working capital went from 106.0 to 120.0 — an increase of 14.0, matching what the cash-flow statement shows working capital consuming — while holding at 12.0% of revenue in both years. The balance grew because the business grew.
Is deferred revenue part of working capital?
Yes, and it runs the opposite way. It is cash the company already holds for work not yet done, so it is customers financing the company. Enough of it can produce a negative cycle.
Is a shorter cycle always better?
This portal gives no threshold and no ranking. A cycle can be shortened by paying suppliers later, which creates nothing and moves a financing requirement to businesses that may fund themselves more expensively. The measure improves either way, which is why the measure alone does not say what happened.
Why call working capital a financing decision?
Because every day of the cycle is capital that must be funded from cash, borrowings or shareholders, and all three components are negotiated — collection terms in contracts, inventory levels as a choice about availability against carrying cost, payment terms with suppliers.
Where do I find out why a component moved?
The notes. The balance shows the level and the movement; the revenue, receivables and inventory notes explain the policies and composition behind them.
References
Educational and informational only — not investment advice, a recommendation, or an offer to buy or sell any security. Investing involves risk, including the possible loss of principal. Worked examples use fictional companies and figures.