What it means
Working capital is the money a business must keep invested in its operations to trade: the stock on its shelves, the invoices its customers have not yet paid, less the credit its suppliers extend. It earns nothing directly; it is the cost of being in business.
The cash flow to working capital ratio asks how much cash that investment supports, which is a measure of how efficiently the business turns its operating capital into money. The ratio is read in two directions.
A high ratio (operating cash flow several times the working capital balance) means the business runs on little working capital relative to its cash generation: a retailer with cash sales and supplier credit, a subscription business with prepayments, a service firm with fast collection. A low ratio (operating cash flow a fraction of working capital) means large sums are tied up relative to the cash produced: a distributor with long terms and wide ranges, a contractor with work in progress, a manufacturer with long production cycles.
Negative working capital, common in retail and subscription businesses, makes the ratio negative or undefined, and in those cases the change-based version is used instead. The change-based reading is often more useful.
Operating cash flow is profit plus non-cash items minus the increase in working capital; the increase in working capital divided by cash generated before working capital shows what share of the business's cash generation went into funding its own growth in receivables and stock. A business generating $10 million before working capital and absorbing $6 million into working capital has converted only 40% of its operating cash generation into cash available for anything else.
When that share rises year on year, the business is over-trading: growing faster than its cash generation can fund, and relying on borrowing to fill the gap. The measure connects to the cash conversion cycle, which expresses the same working capital in days rather than dollars, and to the cash conversion ratio, which compares operating cash flow with profit.
Together they answer: how much is tied up, how long it is tied up for, and how much of profit survives the tying-up as cash. Management uses the ratio to set working capital targets in cash terms (a target ratio of, say, 2.0 means working capital should be no more than half of annual operating cash flow), to evaluate whether a growth plan is affordable (projecting the working capital it will absorb against the cash flow it will produce), and to compare divisions or business lines with different operating models.
Analysts use it to distinguish businesses whose growth is self-funding from those whose growth requires external capital, which affects both valuation and credit risk.
In practice
Real-world examples.
Example
A supermarket with negative working capital funds its growth from suppliers and reports a working capital release every year it expands.
Example
An engineering contractor's working capital absorption reaches 70% of cash generation in a year when three large projects are in their early stages.
Example
A wholesaler sets a target of operating cash flow at least equal to net working capital and reduces its range to achieve it.
Think of it
“Cash flow to working capital shows how much cash you generate relative to working capital invested.
Formula
Calculation
Cash Flow to Working Capital = Operating cash flow / Net working capital
Working Capital Absorption = Increase in working capital / Cash generated before working capital movements x 100%
Net Working Capital (operating) = Receivables + Inventory minus Trade payables
Worked example. Two companies each generate $12,000,000 of cash from operations before working capital movements and tax in the year.
Company A, an equipment distributor: receivables $9,000,000; inventory $8,000,000; trade payables $5,000,000; net working capital $12,000,000 at year end, up from $9,500,000 at the start (increase $2,500,000). Tax paid $2,000,000.
- Operating cash flow = $12,000,000 minus $2,500,000 minus $2,000,000 = $7,500,000
- Cash flow to working capital = $7,500,000 / $12,000,000 = 0.63: each dollar of working capital supports 63 cents of annual operating cash flow, or working capital is 1.6 years of cash flow
- Working capital absorption = $2,500,000 / $12,000,000 = 21% of cash generation
Company B, a subscription software business: receivables $1,500,000; no inventory; trade payables $1,200,000; deferred revenue (customer prepayments, a current liability) $6,000,000; net working capital minus $5,700,000, having been minus $4,800,000 at the start (a release of $900,000 as prepayments grew). Tax paid $2,000,000.
- Operating cash flow = $12,000,000 + $900,000 minus $2,000,000 = $10,900,000
- Cash flow to working capital: not meaningful with negative working capital; the business is funded by its customers
- Working capital absorption = minus 7.5%: working capital released cash rather than absorbing it
Growth test: both plan to grow revenue by 25% next year. Company A's working capital, at its current days, would rise by about $3,000,000, absorbing 25% of its cash generation before working capital and leaving operating cash flow of about $9,000,000 after tax from $15,000,000 of cash generation; its capex and dividend of $8,000,000 would leave $1,000,000. Company B's growth would release a further $1,200,000 of working capital as prepayments rise; its operating cash flow would be about $13,700,000 after tax. Same cash generation before working capital, same growth rate; one business funds its growth from operations with a thin margin, the other is paid to grow.
Company A's improvement: reducing DSO from 55 to 45 days and inventory days from 70 to 60 would release about $3,300,000, taking net working capital to $8,700,000 and the ratio to 0.86 on the current cash flow, and would fund most of next year's growth absorption. The finance director sets a target ratio of 1.0 within two years.
Historical check for Company A: the ratio was 0.95 three years ago. It has fallen because working capital has grown 45% while cash generation has grown 15%: the business has been over-trading, and the overdraft that funded the difference has doubled.Case study
Seen in the real world.
A private equity owner of a specialist distributor was puzzled that the business, which reported EBITDA growth of 15% a year, never produced cash for debt repayment. The operating partner had the cash flow to working capital ratio calculated for five years: it had fallen from 1.1 to 0.4. Net working capital had grown from $8 million to $24 million while cash generation before working capital had grown from $9 million to $10 million.
Absorption had run at 60% to 80% of cash generation every year. The management team's explanation was that growth needed stock and that customers expected terms; the operating partner's response was that growth which absorbed three quarters of the cash it produced was not growth the owner could afford. A working capital programme, run by an interim finance director with the operations team, cut the range by a third, introduced consignment stock for the slowest lines with the two main suppliers, moved the largest customers to direct debit, and shortened standard terms.
Net working capital fell to $15 million in eighteen months, releasing $9 million that repaid a tranche of acquisition debt, and the ratio recovered to 0.8. The management bonus scheme was rewritten with a working capital condition. The operating partner's note to the investment committee said that the company had been a good business that had been lending its cash to its customers and its warehouse, and that the ratio had shown it from the first year.
Watch out
Common mistakes.
- Measuring working capital only in days (the cash conversion cycle) and not in dollars against cash flow, which hides how much of the cash generated is being absorbed.
- Accepting "growth needs working capital" without quantifying whether the growth's cash return justifies the working capital it consumes.
- Comparing the ratio between businesses with different operating models without recognising that negative working capital makes it inapplicable.
Questions
People also ask.
What is a good cash flow to working capital ratio?
Higher is better; above 1.0 means the business generates more cash each year than it has tied up in operations. Businesses with negative working capital are in a different category, funded by customers or suppliers.
How does this relate to the cash conversion cycle?
The cycle measures how long working capital is tied up (days); this ratio measures how much is tied up relative to cash generated (dollars). They move together, and both improve when collection is faster, stock is leaner or supplier terms are longer.
Why does working capital absorption matter for growth?
Because growth increases receivables and inventory in proportion, and that increase must be funded before the growth produces cash. A business that absorbs most of its cash generation in working capital cannot fund its own growth.
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