Profitable businesses run out of cash for one dominant reason: their money is parked in working capital. It sits in invoices customers have not paid, stock on shelves, and deposits paid to suppliers, while wages, super, and BAS fall due on a fixed calendar. The bigger the gap between when you pay out and when you collect, the more cash the business consumes just to stand still, and growth widens the gap rather than closing it.
The cash conversion cycle puts a single number on that gap. This guide shows how to calculate it, what your number means, and the levers that release cash from the cycle without selling anything extra.
Published: June 2026
Working capital is the cash tied up in the operating cycle: debtors (accounts receivable) plus inventory, less creditors (accounts payable). It is the money the business has lent to its customers, parked in its stockroom, and borrowed from its suppliers, netted off.
The cash conversion cycle (CCC) expresses the same idea in days: how long, on average, a dollar spends locked in the cycle between paying for inputs and collecting from customers.
Debtor days (DSO) = (accounts receivable ÷ annual revenue including GST) × 365. It measures how long customers take to pay you. If receivables are $410,000 against $4.4M of GST-inclusive billings, debtor days are 34.
Stock days (DIO) = (inventory ÷ annual cost of goods sold) × 365. How long stock sits before it is sold. Service businesses can skip this term, or substitute unbilled work in progress, which behaves the same way: value created, cash not yet collected.
Creditor days (DPO) = (accounts payable ÷ annual purchases including GST) × 365. How long you take to pay suppliers.
Cash conversion cycle = debtor days + stock days − creditor days.
Match the GST treatment on both sides of each ratio (receivables and payables carry GST, so use GST-inclusive revenue and purchases) or the ratios will flatter you by roughly 10%.
A CCC of 40 means every dollar of daily operating activity is locked up for 40 days, so the business permanently finances about 40 days of cost base from its own cash or an overdraft. A lower number is better; a negative number (collecting from customers before paying suppliers, common in retail and subscription models) means customers and suppliers are financing your growth.
The dollar translation is the part worth memorising: one day of debtor days is worth annual GST-inclusive revenue ÷ 365 in cash. For a $5M revenue business (about $5.5M including GST), each debtor day holds roughly $15,000. Drift from 35 to 50 days, which happens gradually and invisibly, and about $225,000 has silently moved from your bank account into your customers' working capital.
A hypothetical $6M revenue wholesale business (GST-inclusive billings $6.6M, GST-inclusive purchases $4.4M, COGS $4.0M) carries debtors of $740,000, stock of $560,000, and creditors of $390,000.
Debtor days: 740,000 ÷ 6,600,000 × 365 = 41 days. Stock days: 560,000 ÷ 4,000,000 × 365 = 51 days. Creditor days: 390,000 ÷ 4,400,000 × 365 = 32 days. Cash conversion cycle: 41 + 51 − 32 = 60 days.
Now the improvement program. Tightening collections from 41 to 33 days releases 8 days × ($6.6M ÷ 365) ≈ $145,000. Cutting slow-moving stock to bring stock days from 51 to 42 releases 9 days × ($4.0M ÷ 365) ≈ $99,000. Negotiating standard supplier terms from 32 to 38 days adds 6 days × ($4.4M ÷ 365) ≈ $72,000. Total cash released: roughly $316,000, with no new revenue, no cost cuts, and no borrowing. That is typically more cash than a year of profit improvement initiatives will generate, and it arrives once the changes bed in, then stays released permanently.
This lever is usually the largest and the most controllable. Invoice immediately on delivery rather than at month end, since every day of billing delay is a debtor day you gifted away. Shorten terms for new customers (7 or 14 days is increasingly standard for services). Automate the reminder sequence so it runs without anyone feeling awkward, take card or direct debit payment, and require deposits or progress billing on anything large. The full playbook lives in our guides to getting paid faster and debtor management strategies, and for customers who push past terms, credit control covers limits, stop-credit triggers, and provisioning.
Stock improvement is about composition, not blanket cuts. Rank items by stock turn; the slowest 20% of lines usually hold a disproportionate share of the cash. Clear dead stock at a discount (cash recovered beats margin preserved on stock that never sells), reorder fast movers more frequently in smaller quantities, and push suppliers for consignment or shorter lead times where volume justifies it.
Use the full terms you have agreed; paying a 30-day invoice on day 9 donates 21 days of free financing back to the supplier. Negotiate longer standard terms with your largest suppliers, where your volume gives you standing. Two cautions: do not stretch beyond agreed terms, which burns supplier goodwill and eventually price, and never treat the ATO as a creditor lever. GST, PAYG, and super are not financing, and the consequences of using them that way, including personal exposure for directors, are set out in our guide to director penalties in Australia.
Working capital decays without attention, because every individual decision that worsens it (accepting 60-day terms to win a deal, a safety-stock top-up, paying a supplier early to stop the phone calls) looks small. Put debtor days, stock days, and creditor days in the monthly management pack with a 12-month trend, and treat a 3-day adverse move in debtor days as a variance to investigate, the same way you would a margin slip. Pair the metrics with a rolling short-term cash forecast, built per our cash flow forecasting guide, so the cycle's movements are seen in dollars and dates, not just ratios. If nobody in the business owns these numbers week to week, that is a gap an embedded finance team is specifically built to fill, and you can compare that option against an internal hire with our hire vs outsource calculator.
What is the cash conversion cycle?
The number of days cash spends locked in the operating cycle: debtor days plus stock days minus creditor days. It measures how long the business waits between paying for inputs and collecting from customers.
How do you calculate debtor days?
Accounts receivable divided by annual GST-inclusive revenue, multiplied by 365. Use GST-inclusive revenue because the receivables balance includes GST; mixing treatments understates the ratio by about 10%.
What is a good cash conversion cycle for an Australian SME?
It varies by model: service businesses commonly run 30-60 days, wholesale and manufacturing 50-90, and retail can run near zero or negative. The trend matters more than the benchmark; a cycle lengthening month over month is consuming cash regardless of where it started.
How much cash does one debtor day represent?
Annual GST-inclusive revenue divided by 365. For a $5M revenue business, roughly $15,000 per day. Reducing debtor days by ten releases about $150,000, permanently.
Is negative working capital bad?
A negative cash conversion cycle (customers pay before suppliers are paid) is generally an advantage and means the operating cycle funds itself. Negative net working capital on the balance sheet needs more care: it can reflect an efficient model or short-term obligations the business cannot meet, so read it alongside the cash forecast.
Should I pay suppliers early to get discounts?
Only when the discount beats your cost of cash. A 2% discount for paying 20 days early is an effective annualised return above 36%, which is usually worth taking. Early payment with no discount is a donation of free financing.
Why does growth cause cash shortages in profitable businesses?
Growth scales working capital before it scales collections: more sales means more debtors and more stock immediately, while the cash arrives one cycle later. A business with a 60-day cycle growing 30% needs roughly 30% more cash permanently parked in the cycle.
How do I reduce stock without hurting sales?
Rank stock by turn rate, clear the slowest lines at a discount, reorder fast movers in smaller, more frequent batches, and tighten reorder points using actual lead times. The goal is changing the mix of what you hold, not cutting availability of what sells.
About Scale SuiteScale Suite is a Sydney-based provider of outsourced finance teams and fractional CFO services for Australian SMEs. We deliver weekly bookkeeping, payroll, BAS/IAS lodgement, cashflow reporting, management accounts, and strategic fractional CFO oversight, all as a fully embedded team that works inside your business.CA-qualified, Xero Certified, and registered BAS Agents, we replace fragmented bookkeepers and once-a-year accountants with one responsive finance function at a fraction of the cost of full-time hires. We serve growing businesses across Sydney, Melbourne, Brisbane, and Perth, with packages starting from $1,500 per month and no lock-in contracts.
We review and check this guide periodically. At the time of writing (June 2026), all information was current. Scale Suite is a registered BAS Agent, not a licensed tax advisor or financial advisor. This content is general information only and does not constitute professional tax, financial, or legal advice. Some details may change over time.
Scale Suite is a Sydney-based provider of outsourced finance and HR services for Australian SMEs. We deliver bookkeeping, financial reporting, payroll processing, fractional CFO support, recruitment, employee onboarding, people and culture support, and fractional HR oversight, all as a fully embedded team that works inside your business.
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