The working capital cycle explained: why growing businesses run short of cash

Many owners discover the working capital cycle the hard way: sales are up, profit looks healthy, and yet the account is emptier than ever. The explanation is almost always the same. Cash is not disappearing; it is tied up in the business’s cycle, sitting on shelves and in customers’ accounts payable. Understanding that cycle is one of the most useful things a business owner can learn, because it explains cash shortages and shows exactly where to find cash without borrowing. This guide breaks the cycle into its three parts, turns days into dollars with worked examples, and shows practical ways to shorten it before you consider funding.

The cycle in one picture

Imagine following a single dollar through your business. It leaves your account to pay a supplier or a worker. It becomes stock on a shelf or work in progress. It turns into a sale and an invoice. Eventually, a customer pays and the dollar returns, hopefully with a margin attached. The time that dollar spends away from your account is your working capital cycle, also called the cash conversion cycle.

The three parts

Debtor days. How long customers take, on average, to pay you after you invoice. Your aged receivables report shows this. A business invoicing on 30-day terms whose customers actually pay in 45 days has debtor days of about 45.

Stock days. How long stock or materials sit before they are sold or used. Estimate it by dividing your average stock value by your annual cost of sales and multiplying by 365. Service businesses with no stock can treat this as zero, though unbilled work in progress plays a similar role.

Creditor days. How long you take to pay suppliers. If suppliers give you 30-day terms and you use them, creditor days are about 30. This part works in your favour, because suppliers are effectively funding part of your cycle.

Cash conversion cycle = debtor days + stock days − creditor days.

Turning days into dollars

Days become dollars when you multiply them by daily sales or costs. Roughly:

• Cash tied up in debtors = annual sales ÷ 365 × debtor days.
• Cash tied up in stock = annual cost of sales ÷ 365 × stock days.
• Cash provided by suppliers = annual cost of sales ÷ 365 × creditor days.

Working capital required ≈ debtors + stock − supplier credit. The working capital calculator does this automatically and shows what shortening each part would release.

Worked example: a wholesaler

An illustrative wholesaler has annual sales of $2.4m and cost of sales of $1.6m. Customers pay in 45 days, stock sits for 40 days and suppliers are paid in 30 days. The cycle is 45 + 40 − 30 = 55 days. In dollars, debtors are about $296k, stock about $175k and supplier credit about $132k, so about $339k of cash is tied up in the cycle at any time. If customers paid ten days faster, about $66k would be released.

Worked example: a cafe

An illustrative cafe is paid on the spot by card, holds about a week of stock and pays suppliers on 14-day terms. Its cycle is 0 + 7 − 14 = minus 7 days. Suppliers effectively fund its operations. That is why cafes can operate with little working capital, but also why a supplier tightening terms can create a sudden squeeze.

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Why growth eats cash

If your cycle is 55 days and sales grow by a quarter, roughly a quarter more cash needs to be tied up in the cycle. That cash is needed before the extra profit arrives. This is why fast-growing businesses so often need funding even when everything is going well. Planning for it in advance, rather than discovering it in an empty account, is the difference between controlled growth and a crisis. See working capital loans.

Shortening the cycle

Every day you remove from the cycle releases cash.

Reduce debtor days. Invoice immediately, shorten terms for new customers, take deposits, make payment easy and chase promptly. See getting customers to pay faster.

Reduce stock days. Order smaller and more often, clear slow lines, and use sales data to forecast demand. See stock and inventory cash flow.

Increase creditor days, fairly. Negotiate longer terms with suppliers in exchange for reliability. Do not simply pay late; that damages relationships and credit. See negotiating supplier terms.

Funding what remains

Once the cycle is as tight as it reasonably can be, any remaining working capital need can be funded. A line of credit suits needs that rise and fall. Invoice finance suits businesses whose cash is mostly in debtors. A working capital loan suits a step change, such as a large new customer.

Watching the cycle over time

Calculate your cycle quarterly. If debtor days creep up, a customer may be in trouble or your collections process may be slipping. If stock days rise, you may be over-ordering or carrying lines that no longer sell. If creditor days fall, a supplier may have tightened terms. Each change is an early warning, and each is easier to fix early. A simple quarterly note of the three figures, kept alongside your BAS records, is enough to spot a trend before it becomes a cash problem.

The cycle and your lender

Lenders may not ask for your cash conversion cycle by name, but they see its effects in your bank statements: deposits that lag behind supplier payments, and balances that dip as the business grows. Explaining your cycle, and what you are doing to manage it, makes a funding request easier to understand. It shows you know where your cash goes and why you need the facility.

Industries with long and short cycles

Some industries naturally carry long cycles: wholesalers, manufacturers, construction and professional services firms with corporate clients. Others have short or negative cycles: cafes, retailers paid at the counter and subscription businesses billed in advance. Knowing where your industry sits helps set expectations. If your cycle is much longer than similar businesses, it is a sign there is cash to be found in collections, stock or supplier terms.

Key takeaways

The working capital cycle explains why profit and cash differ. Measure it, shorten it where you can and fund the rest deliberately. A business that understands its cycle borrows less, grows more smoothly and rarely gets caught out by its own success.

An illustrative turnaround

An illustrative homewares distributor found its cycle had lengthened from 50 to 72 days over two years as it took on larger retail customers with longer terms and expanded its range. By clearing slow lines, moving to monthly reorders for most products and negotiating 45-day terms with two key suppliers, it cut the cycle back to 55 days and released enough cash to fund its next growth stage with a much smaller facility than it had expected to need.

Release the cash in your cycle

If your cycle is tying up more cash than you can spare, tell us about your business, your terms and what you need. There is no credit check to enquire, your details are not passed to a list of lenders, and a real person reads your enquiry. Accurate figures help us size working capital funding properly. Apply now.