Annual Audit Manual
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7073.5 Step 5: Test Significant Assumptions
Sep-2020
In This Section
Consider Appropriateness of Significant Assumptions in Accordance with Financial Reporting Framework
Auditing Assumptions Used in Discounted Cash Flow Models
Assess Consistency of Significant Assumptions
Assess Management’s Intent and Ability to Carry Out Specific Courses of Action
CAS Requirement
In applying the requirements of paragraph 22, with respect to significant assumptions, the auditor’s further audit procedures shall address (CAS 540.24):
(a) Whether the significant assumptions are appropriate in the context of the applicable financial reporting framework, and, if applicable, changes from prior periods are appropriate;
(b) Whether judgments made in selecting the significant assumptions give rise to indicators of possible management bias;
(c) Whether the significant assumptions are consistent with each other and with those used in other accounting estimates, or with related assumptions used in other areas of the entity’s business activities, based on the auditor’s knowledge obtained in the audit; and
(d) When applicable, whether management has the intent to carry out specific courses of action and has the ability to do so.
CAS Guidance
When a change from prior periods in a method, significant assumption, or the data is not based on new circumstances or new information, or when significant assumptions are inconsistent with each other and with those used in other accounting estimates, or with related assumptions used in other areas of the entity’s business activities, the auditor may need to have further discussions with management about the circumstances and, in doing so, challenge management regarding the appropriateness of the assumptions used (CAS 540.A95).
When the auditor identifies indicators of possible management bias, the auditor may need a further discussion with management and may need to reconsider whether sufficient appropriate audit evidence has been obtained that the method, assumptions and data used were appropriate and supportable in the circumstances. An example of an indicator of management bias for a particular accounting estimate may be when management has developed an appropriate range for several different assumptions, and in each case the assumption used was from the end of the range that resulted in the most favorable measurement outcome (CAS 540.A96).
Relevant considerations for the auditor regarding the appropriateness of the significant assumptions in the context of the applicable financial reporting framework, and, if applicable, the appropriateness of changes from the prior period may include (CAS 540.A102):
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Management’s rationale for the selection of the assumption;
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Whether the assumption is appropriate in the circumstances given the nature of the accounting estimate, the requirements of the applicable financial reporting framework, and the business, industry and environment in which the entity operates; and
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Whether a change from prior periods in selecting an assumption is based on new circumstances or new information. When it is not, the change may not be reasonable nor in compliance with the applicable financial reporting framework. Arbitrary changes in an accounting estimate may give rise to material misstatements of the financial statements or may be an indicator of possible management bias (see paragraphs A133–A136).
Management may evaluate alternative assumptions or outcomes of accounting estimates, which may be accomplished through a number of approaches depending on the circumstances. One possible approach is a sensitivity analysis. This might involve determining how the monetary amount of an accounting estimate varies with different assumptions. Even for accounting estimates measured at fair value, there may be variation because different market participants will use different assumptions. A sensitivity analysis may lead to the development of a number of outcome scenarios, sometimes characterized as a range of outcomes by management, and including ‘pessimistic’ and ‘optimistic’ scenarios (CAS 540.A103).
OAG Guidance
Significant assumptions
We need to evaluate all significant assumptions used to develop in scope accounting estimates. Refer to the section Assumptions in OAG Audit 7073.1 for guidance on understanding management’s assumptions and identifying significant assumptions.
Assumptions are integral components of measurement methods, e.g., valuation methods that employ a combination of estimates of expected future cash flows together with estimates of the values of assets or liabilities in the future, discounted to the present.
The more sensitive the estimate is to changes in an assumption, the more persuasive the evidence needed from testing that assumption. When performing a sensitivity analysis, one or more assumptions are changed by a reasonable variation to calculate the change in the estimate. The rationale for determining which assumptions are considered significant and will be subject to audit procedures needs to be documented. An assumption is generally considered significant if a reasonable variation in the assumption would materially affect the measurement of estimate.
In auditing recurring estimates, consider whether facts and circumstances have changed such that assumptions that were not significant in the previous period have now become significant assumptions.
Evaluating appropriateness of significant assumptions
CAS 540.24 requires us to evaluate the appropriateness of significant assumptions in the context of the applicable financial reporting framework. We need to consider the specific requirements of the applicable financial reporting framework when considering the appropriateness of significant assumptions, using our understanding obtained as part of planning and risk assessment. For example, a financial reporting standard covering retirement benefits may specify the nature of actuarial assumptions to be used in measuring defined benefit obligations (such as demographic and financial assumptions) and require that the assumptions be ‘unbiased and mutually compatible’ and that ‘financial assumptions be based on market expectations, at the end of the reporting period, for the period over which the obligations are to be settled’. Inquiry of the entity’s personnel alone does not provide sufficient appropriate audit evidence and would not be sufficient alone to support our evaluation of the appropriateness of significant assumptions. Refer to the section Requirements of the Applicable Financial Reporting Framework in OAG Audit 7072 for further guidance addressing the evaluation of significant assumptions.
We need to document what we evaluated and the conclusions reached when testing significant assumptions in sufficient detail, such that an experienced auditor having no previous connection with the audit can understand the matters considered, conclusions reached and the related impact on any decisions to perform further procedures.
Audit procedures relating to significant assumptions may require the application of considerable professional judgment because the assumptions are highly subjective or because they are particularly sensitive to changes in the underlying circumstances. Consider using specialists/experts where significant assumptions are complex and may require specialized expertise. Refer to OAG Audit 7073.2 for guidance on determining the need for specialized skills and knowledge.
Our evaluation of significant assumptions may encompass procedures such as:
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Evaluating whether the data on which the assumption is based is accurate, complete and relevant (refer to OAG Audit 7073.6 for guidance on evaluating reliability of data supporting management’s assumptions)
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Identifying the sources of data and factors that management used in forming the assumptions, and considering whether such data and factors are relevant, reliable, and sufficient for the purpose based on information gathered in other audit tests
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Considering whether there are additional relevant factors or alternative assumptions about the factors
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Considering whether changes in the business or industry may cause other factors to become significant to the assumptions
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Reviewing available documentation of the assumptions used in developing the accounting estimates.
Inquire about any other plans, goals, and objectives of the entity, and consider their relationship to the assumptions
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Benchmarking to available alternative assumptions used in the industry or market
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Evaluating whether the entity has an appropriate base for the significant assumptions used in the accounting estimate. In some cases, the assumptions will be based on industry or government statistics, or other external data; in other cases they will be specific to the entity and will be based on internally generated data.
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In evaluating the assumptions we would consider, among other things, whether they are:
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Appropriate in the context of the applicable financial reporting framework requirements
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Reasonable in light of actual results in prior periods
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Consistent with those used for other accounting estimates
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Consistent with management’s plans which themselves appear appropriate
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Based on appropriate formulae
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Consider significant assumptions at a disaggregated level to clearly understand changes from the base or previous period and prevent overlooking a significant change in factors due to a netting effect. For example, if revenue in a discounted cash flow model is best analyzed by product line, considering both price and volume, then we may need to obtain evidence to support the price assumption separately from the evidence to support the volume assumption for the same product line. Similarly, we may need to disaggregate operating expenses when evaluating the forecasted profit margin.
It is important to exercise professional skepticism in evaluating whether the assumptions are reasonable and challenge management about the appropriateness of the assumptions if we identify evidence that indicates the assumptions may not be reasonable or may be subject to management bias.
When auditing recurring estimates, consider if some significant assumptions have changed as compared to the previous period and evaluate if such changes are appropriate. Consider factors noted in CAS 540.A102 when performing this evaluation.
Test evidence with historical results
Consider if the assumption is in line with actual results achieved in recent years and whether consistency is appropriate. For example, if the entity has consistently achieved revenue growth of 3%–5% annually for the past 5 years, we need to be professionally skeptical and critically assess the reasonableness of a significantly higher growth rate assumption used in a discounted cash flow model. Additionally, when growth assumptions differ significantly from historical trends, consider whether this difference is supported by audit evidence, such as contracts or other relevant information, and test management’s plans to achieve these growth rates. As part of this evaluation, consider both price and volume assumptions that may affect the growth rate. For example, the entity may have new sales contracts that are expected to increase the sales volume, but related contract sales prices may be lower, as compared to previous contracts. Even modest growth assumptions may be contrary to recent entity trends which could include flat or negative volume/price trends.
While consistency with historical results is sometimes evidence of reasonable assumptions, we need to also consider if there is a reason that the estimates would in fact differ from historical experience. For instance, we need to consider factors such as the gain or loss of customer contracts, changes in technology, changes in economic conditions, or the presence of any other contradictory evidence when assessing if consistency is reasonable.
When historical results are limited or do not exist, we may consider results from similar events in prior periods or other available industry information. For example, if management is forecasting an increase in revenue due to a new product offering, we may compare the estimates of revenues from the new product to actual revenues achieved in past situations where management introduced a new, similar product, or compare the estimates to the available data for similar entities in the related industry.
Evidence inconsistent with the assumptions used by management
In evaluating evidence about significant assumptions, we need to consider evidence that corroborates management’s assumptions. But it is just as important that we also evaluate evidence that may be inconsistent with management’s assumptions.
During the engagement, additional information may come to light that could contradict the assumptions used by management. For example, if management is communicating information to investors and analysts about expected revenue growth rates that are lower than the assumptions made in the cash flow forecast used to perform an impairment test, this would be contradictory evidence that may call into question the reasonableness of the cash flow forecast.
It is important to exercise professional skepticism in evaluating whether the assumptions are reasonable. If we identify evidence that appears to contradict the assumptions used by management, discuss with the entity and perform further procedures to understand the reasons and challenge management regarding the appropriateness of the assumptions.
We also consider if contradictory evidence may indicate potential management bias (refer to OAG Audit 7073.9 for guidance) and take contradictory as well as corroborative evidence into account when performing an overall evaluation of accounting estimates (refer to guidance in the section Evaluating Appropriateness of Risk Assessment and Audit Evidence Obtained in OAG Audit 7073.10). Also refer to the section Assess Consistency of Significant Assumptions in OAG Audit 7073.5 for guidance on evaluating consistency of assumptions applied by management in other areas.
If we conclude that significant assumptions used by management are unreasonable, refer to the section Determine Whether the Accounting Estimates are Reasonable or Misstated in OAG Audit 7073.10 for guidance on performing overall evaluation and determining if the estimate is misstated.
Related Guidance
- Assumptions (OAG Audit 7073.1)
- Consider management bias (OAG Audit 7073.9)
- Perform overall evaluation (OAG Audit 7073.10)
OAG Guidance
Estimates of future cash flows arise in many different areas of the audit, including goodwill, intangibles, asset impairment analyses, valuation of assets acquired or liabilities assumed in a business combination, going concern analyses, recoverability assessments for deferred tax assets among other areas.
While cash flow forecasts are often only one of many factors used by management in calculating an estimate, the cash flow forecasts are usually a significant input to the estimate and are therefore an area of focus of our audit procedures. While the responsibility for auditing the cash flow forecasts inherent in management’s estimates rests with us, there are certain auditing procedures where an internal valuation specialist/expert can provide assistance. Accordingly, we consider whether to engage an internal valuation specialist/expert to obtain audit evidence in support of certain significant assumptions within the cash flow forecast or the fair value estimate, considering guidance in OAG Audit 7071.
Below are some examples of assumptions often found in cash flow forecasts and examples of potential methods to test those assumptions. These are provided for illustrative purposes only. We need to consider specific engagement circumstances when determining the relevant factors and developing our audit responses to the assessed risks.
Note that additional considerations not addressed in the examples below may be relevant when auditing asset impairment calculations using ‘Fair value less costs to sell’ (FVLCTS) or ‘Value in use’ (VIU).
Assumption | Examples of relevant considerations | |||||||||||||||
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Revenue growth |
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Margin (gross margin, EBIT/operating margin and EBITDA margin) |
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Capital expenditures and depreciation/amortization |
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Working capital requirements |
A change in the net working capital assumption is included in the analysis as it represents a change in cash flows. For example, if net working capital is projected to increase, the estimated cash flows for that period are reduced accordingly. Consider the change in net working capital in light of changes in estimates of future revenues and margins. For example, if revenues are expected to increase and the cash conversion cycle remains constant, the associated components of working capital also change and often result in an increase in net working capital. This is because accounts receivable would increase due to increased sales. |
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Discount rate |
Typically, an entity would use the weighted average cost of capital (WACC) as its discount rate. Given the complexity and judgmental nature of determining the reasonableness of the WACC, management may have engaged its own expert to calculate it, and we may consider using an auditor’s internal expert to assist in our evaluation. The weighted average cost of capital (“WACC”) represents the required rate of return used to discount expected future cash flows and is calculated as the weighted average rate of return on equity and debt based on market participant assumptions for the proportion of debt and equity in the entity’s capital structure. The following are the key inputs used in calculating the WACC
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The following additional considerations may also be relevant to asset impairment calculations:
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CAS Guidance
Through the knowledge obtained in performing the audit, the auditor may become aware of or may have obtained an understanding of assumptions used in other areas of the entity’s business. Such matters may include, for example, business prospects, assumptions in strategy documents and future cash flows. Also, if the engagement partner has performed other engagements for the entity, CAS 315 requires the engagement partner to consider whether information obtained from those other engagements is relevant to identifying risks of material misstatement. This information may also be useful to consider in addressing whether significant assumptions are consistent with each other and with those used in other accounting estimates (CAS 540.A104).
OAG Guidance
We need to consider the assumptions used to develop in scope estimates individually and as a whole in order to determine that they are consistent with each other, with assumptions used in other accounting estimates, and with actual events in the business. A common audit technique is comparing, as appropriate, the assumptions to similar assumptions used in the forecasts of other internally generated prospective financial information, such as Board of Directors’ presentations and internal operating budgets in order to identify any inconsistent information.
Some examples of places where we may identify inconsistent evidence:
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Review of minutes (e.g., board meetings)
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Analyst/industry reports
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Procedures in other audit areas
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Information obtained through other engagement team members, including Tax and Risk Assurance specialists
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Historical results
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Press releases and earnings calls
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Client website, press publications and marketing materials
It is important to exercise professional skepticism when evaluating any inconsistent information. If we identify inconsistencies, discuss with the entity and perform further procedures to understand the reasons, as appropriate in the engagement circumstances. In evaluating the sufficiency and appropriateness of audit evidence we include in this evaluation inconsistent or contradictory evidence (in accordance with CAS 330.26 and CAS 540.34), and our documentation includes sufficient explanation of our point of view about its impact on the reasonableness of the assumption.
As noted in CAS 540.A104, if we performed other engagements for the entity, we also consider if information obtained from those other engagements may indicate potential inconsistencies in assumptions, which would need to be considered.
CAS Guidance
The appropriateness of the significant assumptions in the context of the requirements of the applicable financial reporting framework may depend on management’s intent and ability to carry out certain courses of action. Management often documents plans and intentions relevant to specific assets or liabilities and the applicable financial reporting framework may require management to do so. The nature and extent of audit evidence to be obtained about management’s intent and ability is a matter of professional judgment. When applicable, the auditor’s procedures may include the following (CAS 540.A105):
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Review of management’s history of carrying out its stated intentions.
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Inspection of written plans and other documentation, including, when applicable, formally approved budgets, authorizations or minutes.
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Inquiry of management about its reasons for a particular course of action.
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Review of events occurring subsequent to the date of the financial statements and up to the date of the auditor’s report.
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Evaluation of the entity’s ability to carry out a particular course of action given the entity’s economic circumstances, including the implications of its existing commitments and legal, regulatory, or contractual restrictions that could affect the feasibility of management’s actions.
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Consideration of whether management has met the applicable documentation requirements, if any, of the applicable financial reporting framework.
Certain financial reporting frameworks, however, may not permit management’s intentions or plans to be taken into account when making an accounting estimate. This is often the case for fair value accounting estimates because their measurement objective requires that significant assumptions reflect those used by marketplace participants.
OAG Guidance
As noted in CAS 540.A105, the appropriateness of significant assumptions may depend on management’s ability and intent to carry out certain courses of action. For example, one of the significant assumptions used in a discounted cash flow model may relate to the estimated revenue growth rate resulting from a business expansion, and we need to evaluate the entity’s ability to carry out the expansion given the entity’s economic circumstances.
In considering whether management genuinely intends to carry out courses of action, we consider whether evidence obtained in other areas of the audit is consistent with management’s stated intentions and, if necessary, obtain additional evidence to verify these intentions. For example, if management’s forecasts show a reduced level of operating costs and management states its intention to achieve this reduction by reducing expenditures in certain business units, we might consider examining trends in expenditures in those units after the period end and evaluating whether this corroborates or contradicts management’s stated intentions.
It is often an effective audit technique to consider management’s history of achieving its planned results. For example, if management is forecasting that revenue will increase by 5% annually due to anticipated price increases, we need to consider whether or not previous price increases were successfully implemented. We may also consider whether current agreements include fixed prices, whether recently executed contracts incorporate expected price increases, or other customer, market or related factors that might corroborate or be contrary to management’s forecasted increase in revenue. It would also be appropriate to consider whether price increases may have a negative impact on volumes sold.
For examples of other procedures we may perform, refer to CAS 540.A105. It is important to exercise professional skepticism and critically evaluate management’s intent and ability to carry out specific courses of action. If we identify evidence that does not support management’s assumptions, we need to communicate to management, challenge the related assumptions and perform further procedures, as appropriate in the engagement circumstances.