What it means
Every trading business runs two pools of capital at once. Fixed capital sits in the assets you can point at, the vans, the ovens, the shop fit-out, while circulating capital sits in assets that are constantly changing form.
A bakery's oven is fixed capital, and its flour, its unpaid catering invoices and its till float are circulating capital. The distinction matters because the two behave differently under growth.
Fixed capital is a step cost, bought occasionally in lumps, while circulating capital scales almost directly with sales, so doubling revenue usually means close to doubling stock and receivables. This is a large part of why profitable, fast-growing businesses still run out of money.
In modern accounts the same idea appears under the heading working capital, calculated as current assets minus current liabilities. Trade payables belong in the calculation because suppliers who let you pay in 30 days are funding part of your cycle at no charge.
The lower your net circulating capital for a given level of sales, the less external funding you need to trade. The other way to look at it is in time rather than money.
The cash conversion cycle counts how many days pass between paying for stock and being paid by the customer, and every day removed from that cycle releases cash permanently. Tighter credit control, less slow-moving stock and longer supplier terms all shorten it.
One caution: cutting circulating capital too hard has costs of its own. Thin stock means lost sales and expensive urgent freight, and aggressive collection can cost you good customers.
The aim is a level that supports trading comfortably, not the lowest number you can reach.
In practice
Real-world examples.
Example
A garden centre sells almost nothing between November and February but must buy plants and compost in January for the spring season. Its circulating capital peaks just before the busiest trading months, so it arranges a seasonal overdraft rather than a term loan, which would sit idle for half the year.
Example
An electronics wholesaler wins a large retail contract with 90-day payment terms. Revenue rises immediately but circulating capital rises faster, because the wholesaler pays suppliers in 30 days and waits three months to be paid, so it needs additional funding despite improving profit.
Example
A software business converts from perpetual licences billed in arrears to annual subscriptions billed upfront. Receivables fall sharply and cash arrives before the cost of service is incurred, so circulating capital goes negative and the business funds its own growth.
Formula
Calculation
Circulating capital = inventory + trade receivables + cash - trade payables. The related timing measure is the cash conversion cycle = inventory days + receivable days - payable days.
Worked example: a distributor's year-end balance sheet shows inventory of $420,000, trade receivables of $310,000 and cash of $90,000, against trade payables of $250,000.
Circulating capital = $420,000 + $310,000 + $90,000 - $250,000
Circulating capital = $820,000 - $250,000 = $570,000
Now the timing view. The distributor holds stock for 60 days on average, collects from customers in 45 days and pays suppliers in 30 days, so the cash conversion cycle is 60 + 45 - 30 = 75 days. Dividing 365 by 75 shows the capital turns over about 4.9 times a year.
Suppose the business trims stock cover from 60 days to 45 days at the same trading volume. Fifteen days of a 60-day inventory balance is $420,000 x 15 / 60 = $105,000, so inventory falls to $420,000 - $105,000 = $315,000 and roughly $105,000 of cash is released. Circulating capital falls to $465,000 and the cash conversion cycle shortens to 45 + 45 - 30 = 60 days.Case study
Seen in the real world.
Corran Hardware is an illustrative, fictional builders' merchant with $9 million of annual revenue and a healthy 11% operating margin. Over three years it grew revenue by 45%, and its bank facility went from comfortable to permanently at the limit, which the owners could not square with consistently strong profits.
A review of the fictional company's numbers showed the cause plainly. Inventory days had drifted from 55 to 82 as branch managers added lines nobody centrally reviewed, and receivable days had crept from 40 to 58 because credit control had not been staffed to match the extra accounts. Payable days were unchanged at 32, so the cash conversion cycle had lengthened from 63 days to 108 days, and roughly $1.1 million of extra cash had quietly moved into stock and unpaid invoices.
Corran did not need more sales or a bigger margin, it needed its circulating capital back. Culling 900 slow lines and hiring one credit controller returned the cycle to about 70 days within two quarters and cleared most of the overdraft, without any change to the trading model.
Watch out
Common mistakes.
- Assuming a profitable business cannot run short of cash. Profit is measured when a sale is made, while circulating capital measures when cash actually moves, and rapid growth widens the gap between the two.
- Ignoring payables when sizing the requirement. Supplier credit funds part of the cycle, so a business that pays everyone immediately needs far more of its own money than one that uses agreed terms.
- Treating all inventory as equally useful. A large stock figure made up of slow-moving lines locks up cash without supporting sales, so the composition matters as much as the total.
Questions
People also ask.
Is circulating capital the same as working capital?
In practice they describe the same pool, though working capital is the formal accounting measure of current assets minus current liabilities and circulating capital is the older economic term that emphasises the cycle.
Can circulating capital be negative?
Yes, and it is a strong position, since businesses that collect cash from customers before paying suppliers, such as supermarkets and subscription firms, are funded by their own trading cycle.
How much circulating capital should a business hold?
There is no universal figure, but comparing your cash conversion cycle with others in the same sector will usually show quickly whether you are carrying more than the trading model requires.
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