What is the valuation assertion?
The PCAOB and FRC flag the same problem year after year: audit teams recalculate management's model, confirm the output ties to the financial statements (FS), sign off, and move on. The arithmetic checks out. The assumptions behind it were never tested. This is the core failure pattern on the valuation assertion, and it shows up in inspection findings more than any other assertion-level deficiency.
Under ISA 315 .A190(a), the valuation assertion asks whether assets, liabilities, and equity interests are recorded at appropriate amounts. That means the right measurement basis has been selected (cost, fair value, net realisable value, or amortised cost) and applied correctly, including allocation adjustments such as depreciation and impairment.
For straightforward balances (cash in functional currency, short-term receivables with no credit risk) valuation risk is typically low. The assertion becomes dominant when estimates enter the picture. Impairment testing under IAS 36 requires discounted cash flow projections. Expected credit losses (ECL) under IFRS 9 require probability of default and loss given default inputs. Fair value measurements under IFRS 13 require selecting valuation techniques and market inputs. In each case, the recorded amount depends on judgement, not just transaction data.
ISA 540.13 requires the auditor to evaluate whether accounting estimates are reasonable in the context of the applicable financial reporting framework. This means challenging the assumptions underlying the estimate, not just verifying the arithmetic of the model. The distinction between testing the calculation and testing the inputs is where most valuation deficiencies originate. We have seen teams spend hours ticking and bashing a DCF model cell by cell while accepting a discount rate that management pulled out of thin air (or, as some partners put it, a PIOOMA number).
Key Points
- Valuation asks whether the number is correct, not whether the item exists. An asset can exist and still be misstated if it is carried at the wrong amount.
- Most valuation issues involve estimates: impairment models, ECL calculations, fair value measurements, and provisions. These require judgement-heavy inputs that management controls.
- ISA 540 requires challenging assumptions, not just verifying arithmetic. Recalculating a model confirms the maths. It says nothing about whether the discount rate or growth rate inputs are reasonable.
- Inspection findings consistently cite insufficient challenge of management assumptions. Teams accept inputs provided by management without independent corroboration or sensitivity analysis.
Why it matters in practice
Inspection findings on valuation follow a consistent pattern: the audit team obtains management's model, recalculates it, confirms the output matches the FS, and concludes. The arithmetic is verified. But ISA 540.13 (b) requires the auditor to evaluate whether the assumptions are reasonable (the discount rate, the terminal growth rate, the probability weightings, the recovery rate). When teams accept these inputs without benchmarking them against external data or testing their sensitivity, the valuation assertion is not adequately tested. This is the finding that generates the most review notes on files we have seen.
IFRS 9 ECL models illustrate this clearly. Teams frequently accept the probability of default (PD) and loss given default (LGD) inputs from management's credit risk team without testing how those inputs were derived or whether they reflect current economic conditions. The model recalculates correctly, but the inputs driving the output have not been challenged. ISA 540 .A131 specifically addresses the need to evaluate whether management's assumptions are consistent with observable market data.
Key standard references
- ISA 315 .A190(a) defines valuation and allocation as an assertion about account balances at period end.
- ISA 540.13 requires the auditor to evaluate whether accounting estimates and related disclosures are reasonable.
- ISA 540 .A131 addresses evaluating whether management's assumptions are consistent with observable market data and other evidence.
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Frequently asked questions
When does valuation become the dominant assertion?
Valuation becomes dominant when estimates enter the picture: impairment testing under IAS 36, expected credit losses under IFRS 9, fair value measurements, and provisions. For straightforward balances (cash, short-term receivables in functional currency), valuation risk is typically low.
What is the difference between valuation and accuracy?
Valuation applies to account balances at period end (ISA 315.A190(a)). Accuracy applies to classes of transactions during the period (ISA 315.A190(b)). A receivable at the wrong amount at year-end is valuation. A sales transaction at the wrong price during the year is accuracy. The procedures differ accordingly.
Why do inspection findings focus on assumptions rather than arithmetic?
Recalculating a DCF model verifies arithmetic, not valuation. ISA 540.13(b) requires the auditor to evaluate whether the assumptions underlying the estimate are reasonable. The PCAOB and FRC consistently find that teams verify the maths while accepting management's discount rates and growth assumptions without challenge.