Key Points
- CCC equals inventory days plus receivable days minus payable days; a lower figure means the entity converts stock to cash faster.
- Most mid-market European manufacturers report a CCC between 40 and 90 days depending on sector and payment culture.
- A lengthening CCC across periods often precedes the liquidity problems that ISA 570 requires the auditor to evaluate.
- The metric is only as reliable as its three components, so the auditor must verify the underlying receivables, inventory, and payables balances before drawing conclusions.
What is Cash Conversion Cycle?
The formula adds inventory days (closing inventory divided by cost of sales, multiplied by 365) to receivable days (trade receivables divided by revenue, multiplied by 365) and subtracts payable days (trade payables divided by cost of sales, multiplied by 365). A positive result means the entity finances part of its operating cycle from its own cash or borrowings. A negative result (rare outside retail) means supplier credit funds the full cycle.
ISA 520.5 requires the auditor to design analytical procedures as risk assessment procedures. The CCC is one of the most informative because it connects three balance sheet lines to the income statement in a single figure. When the CCC lengthens by 15 or more days year-on-year, the auditor traces which component moved. A spike in inventory days points toward obsolescence risk under IAS 2.28. A spike in receivable days raises questions about revenue recognition timing under IFRS 15.46 or credit risk under IFRS 9. A drop in payable days could mean suppliers are tightening terms because they perceive credit risk.
ISA 570.A3 lists the inability to pay creditors on due dates as a going concern indicator. A lengthening CCC is frequently the earliest quantitative signal of that inability, surfacing months before the entity actually misses a payment.
Worked example
Client: Italian food production company, FY2025, revenue EUR 67M, IFRS reporter. Rossi produces packaged pasta and sauces for retail chains across Southern Europe. Cost of sales is EUR 48.2M.
Step 1 — Calculate inventory days
Closing inventory is EUR 8.1M. Inventory days equal (EUR 8.1M / EUR 48.2M) x 365 = 61.4 days. Prior year: (EUR 7.0M / EUR 44.6M) x 365 = 57.3 days.
Documentation note: record inventory per the count reconciliation and cost of sales per the income statement. Note the 4.1-day increase for investigation.
Step 2 — Calculate receivable days
Trade receivables are EUR 11.6M. Receivable days equal (EUR 11.6M / EUR 67M) x 365 = 63.2 days. Prior year: (EUR 9.8M / EUR 61.5M) x 365 = 58.2 days.
Documentation note: record receivables per the aged listing (reconciled to the sub-ledger). Confirm the balance excludes contract assets under IFRS 15.105.
Step 3 — Calculate payable days
Trade payables are EUR 6.9M. Payable days equal (EUR 6.9M / EUR 48.2M) x 365 = 52.3 days. Prior year: (EUR 7.4M / EUR 44.6M) x 365 = 60.5 days.
Documentation note: record payables per the supplier reconciliation. Enquire whether any supplier finance arrangements exist per IAS 7.44A.
Step 4 — Assemble the CCC
Current year: 61.4 + 63.2 - 52.3 = 72.3 days. Prior year: 57.3 + 58.2 - 60.5 = 55.0 days. The CCC has lengthened by 17.3 days (31%).
Documentation note: present the CCC calculation with all three components side by side for both years. Flag the 17.3-day deterioration under ISA 520.7 as exceeding the 10-day investigation threshold set at planning. Note that the deterioration is driven by all three components moving unfavourably: inventory and receivables rising while payable days fell.
Step 5 — Investigate the movement
Management explains that two large retail customers delayed payments in Q4 2025 (driving receivable days up) while a key raw-material supplier shortened payment terms from 60 to 45 days after a credit review (driving payable days down). The inventory build reflects pre-purchasing of olive oil ahead of anticipated price increases.
Documentation note: obtain the revised supplier contract for the shortened terms. For the delayed customer payments, test the aged receivables and evaluate whether the provision matrix captures the increased credit risk. For the inventory build, verify purchase orders and test whether cost still sits below net realisable value per IAS 2.28.
Conclusion: the CCC of 72.3 days is defensible once the auditor has confirmed the inventory is not impaired, the overdue receivables are recoverable, and the payable days compression reflects a genuine commercial renegotiation rather than liquidity stress.
Why it matters in practice
- Teams calculate the CCC at year-end but fail to compute it at interim dates. A year-end CCC can be flattering if the entity manages working capital around the reporting date (window-dressing). ISA 240.A46 identifies unusual transactions close to the period end as a fraud risk indicator. Comparing the year-end CCC to the Q2 or Q3 figure reveals whether the improvement is sustainable or cosmetic.
- The connection between a lengthening CCC and going concern is under-documented. ISA 570.16 requires the auditor to evaluate management's assessment of the entity's ability to continue as a going concern. A CCC that has deteriorated by 20 or more days over two consecutive periods is a quantitative input into that evaluation, yet audit files often present the going concern analysis and the working capital analytics in separate sections with no cross-reference.
Cash conversion cycle vs free cash flow
| Dimension | Cash conversion cycle | Free cash flow |
|---|---|---|
| What it measures | Days between cash outflow for inventory and cash inflow from customers | Absolute cash generated after operating expenses and capital expenditure |
| Unit | Days | Currency (e.g., euros) |
| What drives it | Working capital efficiency across receivables, inventory, and payables | Operating profitability and capital expenditure discipline |
| Going concern signal | Lengthening cycle warns of liquidity timing mismatch | Persistent negative FCF warns of structural cash burn |
| Audit use | Analytical procedure under ISA 520 for working capital components | Cash flow analysis supporting ISA 570 going concern evaluation |
The two metrics complement each other. An entity can report positive free cash flow while its CCC lengthens (because asset sales or financing mask deteriorating working capital). Conversely, a short CCC does not guarantee positive FCF if capital expenditure is high.
Related terms
Frequently asked questions
How do I calculate the cash conversion cycle?
Add inventory days (inventory / cost of sales x 365) to receivable days (trade receivables / revenue x 365) and subtract payable days (trade payables / cost of sales x 365). ISA 520.5 requires the auditor to develop an expectation for each component before assembling the composite figure. Document all three inputs with prior-year comparatives.
Can the cash conversion cycle be negative?
Yes. A negative CCC means the entity collects from customers before it pays suppliers. This is common in grocery retail and subscription businesses where customers pay upfront. IAS 7.18–20 still requires the cash flows from these activities to be reported within operating activities regardless of the cycle's direction. The auditor verifies that the negative CCC reflects genuine business terms rather than understated payables.
When does a lengthening cash conversion cycle indicate going concern risk?
ISA 570.A3 lists the inability to pay creditors on due dates as one indicator. A CCC that lengthens by 15 to 20 days year-on-year, particularly when driven by falling payable days (suppliers demanding faster payment), signals deteriorating liquidity. The auditor evaluates whether the entity has undrawn credit facilities or other sources of funding to absorb the gap before concluding on going concern.