ISA 520433
AUDITING
INTERNATIONAL STANDARD ON AUDITING 520
ANALYTICAL PROCEDURES
(Effective for audits of financial statements for periods
beginning on or after December 15, 2009)
CONTENTS
Paragraph
Introduction
Scope of this ISA ........................................................................................ 1
Effective Date ............................................................................................. 2
Objectives .................................................................................................. 3
Definition ................................................................................................... 4
Requirements
Substantive Analytical Procedures .............................................................. 5
Analytical Procedures that Assist When Forming an Overall
Conclusion............................................................................................ 6
Investigating Results of Analytical Procedures .......................................... 7
Application and Other Explanatory Material
Definition of Analytical Procedures ........................................................... A1–A3
Substantive Analytical Procedures .............................................................. A4–A16
Analytical Procedures that Assist When Forming an
Overall Conclusion .............................................................................. A17–A19
Investigating Results of Analytical Procedures .......................................... A20–A21
International Standard on Auditing (ISA) 520, “Analytical Procedures” should be
read in conjunction with ISA 200, “Overall Objectives of the Independent Auditor
and the Conduct of an Audit in Accordance with International Standards on
Auditing.”
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Introduction
Scope of this ISA
1. This International Standard on Auditing (ISA) deals with the auditor’s use of
analytical procedures as substantive procedures (“substantive analytical
procedures”). It also deals with the auditor’s responsibility to perform
analytical procedures near the end of the audit that assist the auditor when
forming an overall conclusion on the financial statements. ISA 3151
deals
with the use of analytical procedures as risk assessment procedures. ISA 330
includes requirements and guidance regarding the nature, timing and extent
of audit procedures in response to assessed risks; these audit procedures may
include substantive analytical procedures.2
Effective Date
2. This ISA is effective for audits of financial statements for periods beginning
on or after December 15, 2009.
Objectives
3. The objectives of the auditor are:
(a) To obtain relevant and reliable audit evidence when using substantive
analytical procedures; and
(b) To design and perform analytical procedures near the end of the audit
that assist the auditor when forming an overall conclusion as to
whether the financial statements are consistent with the auditor’s
understanding of the entity.
Definition
4. For the purposes of the ISAs, the term “analytical procedures” means
evaluations of financial information through analysis of plausible
relationships among both financial and non-financial data. Analytical
procedures also encompass such investigation as is necessary of identified
fluctuations or relationships that are inconsistent with other relevant
information or that differ from expected values by a significant amount.
(Ref: Para. A1–A3)
1
ISA 315, “Identifying and Assessing the Risks of Material Misstatement through Understanding the
Entity and Its Environment,” paragraph 6(b).
2
ISA 330, “The Auditor’s Reponses to Assessed Risks,” paragraphs 6 and 18.
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Requirements
Substantive Analytical Procedures
5. When designing and performing substantive analytical procedures, either
alone or in combination with tests of details, as substantive procedures in
accordance with ISA 330,3
the auditor shall: (Ref: Para. A4–A5)
(a) Determine the suitability of particular substantive analytical
procedures for given assertions, taking account of the assessed risks
of material misstatement and tests of details, if any, for these
assertions; (Ref: Para. A6–A11)
(b) Evaluate the reliability of data from which the auditor’s expectation
of recorded amounts or ratios is developed, taking account of source,
comparability, and nature and relevance of information available, and
controls over preparation; (Ref: Para. A12–A14)
(c) Develop an expectation of recorded amounts or ratios and evaluate
whether the expectation is sufficiently precise to identify a
misstatement that, individually or when aggregated with other
misstatements, may cause the financial statements to be materially
misstated; and (Ref: Para. A15)
(d) Determine the amount of any difference of recorded amounts from
expected values that is acceptable without further investigation as
required by paragraph 7. (Ref: Para. A16)
Analytical Procedures that Assist When Forming an Overall Conclusion 
6. The auditor shall design and perform analytical procedures near the end of
the audit that assist the auditor when forming an overall conclusion as to
whether the financial statements are consistent with the auditor’s
understanding of the entity. (Ref: Para. A17–A19)
Investigating Results of Analytical Procedures 
7. If analytical procedures performed in accordance with this ISA identify
fluctuations or relationships that are inconsistent with other relevant
information or that differ from expected values by a significant amount, the
auditor shall investigate such differences by:
(a) Inquiring of management and obtaining appropriate audit evidence
relevant to management’s responses; and
(b) Performing other audit procedures as necessary in the circumstances.
(Ref: Para. A20–A21)
3
ISA 330, paragraph 18.
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ISA 520 436
***
Application and Other Explanatory Material 
Definition of Analytical Procedures (Ref: Para. 4)
A1. Analytical procedures include the consideration of comparisons of the
entity’s financial information with, for example:
• Comparable information for prior periods.
• Anticipated results of the entity, such as budgets or forecasts, or
expectations of the auditor, such as an estimation of depreciation.
• Similar industry information, such as a comparison of the entity’s
ratio of sales to accounts receivable with industry averages or with
other entities of comparable size in the same industry.
A2. Analytical procedures also include consideration of relationships, for example:
• Among elements of financial information that would be expected to
conform to a predictable pattern based on the entity’s experience,
such as gross margin percentages.
• Between financial information and relevant non-financial information,
such as payroll costs to number of employees.
A3. Various methods may be used to perform analytical procedures. These
methods range from performing simple comparisons to performing complex
analyses using advanced statistical techniques. Analytical procedures may
be applied to consolidated financial statements, components and individual
elements of information.
Substantive Analytical Procedures (Ref: Para. 5) 
A4. The auditor’s substantive procedures at the assertion level may be tests of
details, substantive analytical procedures, or a combination of both. The
decision about which audit procedures to perform, including whether to use
substantive analytical procedures, is based on the auditor’s judgment about
the expected effectiveness and efficiency of the available audit procedures to
reduce audit risk at the assertion level to an acceptably low level.
A5. The auditor may inquire of management as to the availability and reliability
of information needed to apply substantive analytical procedures, and the
results of any such analytical procedures performed by the entity. It may be
effective to use analytical data prepared by management, provided the
auditor is satisfied that such data is properly prepared.
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Suitability of Particular Analytical Procedures for Given Assertions (Ref: Para. 5(a)) 
A6. Substantive analytical procedures are generally more applicable to large
volumes of transactions that tend to be predictable over time. The application of
planned analytical procedures is based on the expectation that relationships
among data exist and continue in the absence of known conditions to the
contrary. However, the suitability of a particular analytical procedure will
depend upon the auditor’s assessment of how effective it will be in detecting a
misstatement that, individually or when aggregated with other misstatements,
may cause the financial statements to be materially misstated.
A7. In some cases, even an unsophisticated predictive model may be effective as
an analytical procedure. For example, where an entity has a known number
of employees at fixed rates of pay throughout the period, it may be possible
for the auditor to use this data to estimate the total payroll costs for the
period with a high degree of accuracy, thereby providing audit evidence for
a significant item in the financial statements and reducing the need to
perform tests of details on the payroll. The use of widely recognized trade
ratios (such as profit margins for different types of retail entities) can often
be used effectively in substantive analytical procedures to provide evidence
to support the reasonableness of recorded amounts.
A8. Different types of analytical procedures provide different levels of
assurance. Analytical procedures involving, for example, the prediction of
total rental income on a building divided into apartments, taking the rental
rates, the number of apartments and vacancy rates into consideration, can
provide persuasive evidence and may eliminate the need for further
verification by means of tests of details, provided the elements are
appropriately verified. In contrast, calculation and comparison of gross
margin percentages as a means of confirming a revenue figure may provide
less persuasive evidence, but may provide useful corroboration if used in
combination with other audit procedures.
A9. The determination of the suitability of particular substantive analytical
procedures is influenced by the nature of the assertion and the auditor’s
assessment of the risk of material misstatement. For example, if controls
over sales order processing are deficient, the auditor may place more
reliance on tests of details rather than on substantive analytical procedures
for assertions related to receivables.
A10. Particular substantive analytical procedures may also be considered suitable
when tests of details are performed on the same assertion. For example,
when obtaining audit evidence regarding the valuation assertion for accounts
receivable balances, the auditor may apply analytical procedures to an aging
of customers’ accounts in addition to performing tests of details on
subsequent cash receipts to determine the collectability of the receivables.
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Considerations Specific to Public Sector Entities 
A11. The relationships between individual financial statement items traditionally
considered in the audit of business entities may not always be relevant in the
audit of governments or other non-business public sector entities; for example,
in many public sector entities there may be little direct relationship between
revenue and expenditure. In addition, because expenditure on the acquisition
of assets may not be capitalized, there may be no relationship between
expenditures on, for example, inventories and fixed assets and the amount of
those assets reported in the financial statements. Also, industry data or
statistics for comparative purposes may not be available in the public sector.
However, other relationships may be relevant, for example, variations in the
cost per kilometer of road construction or the number of vehicles acquired
compared with vehicles retired.
The Reliability of the Data (Ref: Para. 5(b))
A12. The reliability of data is influenced by its source and nature and is dependent
on the circumstances under which it is obtained. Accordingly, the following
are relevant when determining whether data is reliable for purposes of
designing substantive analytical procedures:
(a) Source of the information available. For example, information may
be more reliable when it is obtained from independent sources
outside the entity;4
(b) Comparability of the information available. For example, broad
industry data may need to be supplemented to be comparable to that
of an entity that produces and sells specialized products;
(c) Nature and relevance of the information available. For example,
whether budgets have been established as results to be expected
rather than as goals to be achieved; and
(d) Controls over the preparation of the information that are designed to
ensure its completeness, accuracy and validity. For example, controls
over the preparation, review and maintenance of budgets.
A13. The auditor may consider testing the operating effectiveness of controls, if
any, over the entity’s preparation of information used by the auditor in
performing substantive analytical procedures in response to assessed risks.
When such controls are effective, the auditor generally has greater confidence
in the reliability of the information and, therefore, in the results of analytical
procedures. The operating effectiveness of controls over non-financial
information may often be tested in conjunction with other tests of controls.
For example, in establishing controls over the processing of sales invoices, an
4
ISA 500, “Audit Evidence,” paragraph A31.
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AUDITING
entity may include controls over the recording of unit sales. In these
circumstances, the auditor may test the operating effectiveness of controls
over the recording of unit sales in conjunction with tests of the operating
effectiveness of controls over the processing of sales invoices. Alternatively,
the auditor may consider whether the information was subjected to audit
testing. ISA 500 establishes requirements and provides guidance in
determining the audit procedures to be performed on the information to be
used for substantive analytical procedures.5
A14. The matters discussed in paragraphs A12(a)–A12(d) are relevant irrespective
of whether the auditor performs substantive analytical procedures on the
entity’s period-end financial statements, or at an interim date and plans to
perform substantive analytical procedures for the remaining period. ISA 330
establishes requirements and provides guidance on substantive procedures
performed at an interim date.6
Evaluation Whether the Expectation Is Sufficiently Precise (Ref: Para. 5(c))
A15. Matters relevant to the auditor’s evaluation of whether the expectation can be
developed sufficiently precisely to identify a misstatement that, when
aggregated with other misstatements, may cause the financial statements to be
materially misstated, include:
• The accuracy with which the expected results of substantive
analytical procedures can be predicted. For example, the auditor may
expect greater consistency in comparing gross profit margins from
one period to another than in comparing discretionary expenses, such
as research or advertising.
• The degree to which information can be disaggregated. For example,
substantive analytical procedures may be more effective when applied
to financial information on individual sections of an operation or to
financial statements of components of a diversified entity, than when
applied to the financial statements of the entity as a whole.
• The availability of the information, both financial and non-financial.
For example, the auditor may consider whether financial information,
such as budgets or forecasts, and non-financial information, such as
the number of units produced or sold, is available to design
substantive analytical procedures. If the information is available, the
auditor may also consider the reliability of the information as
discussed in paragraphs A12–A13 above.
5
ISA 500, paragraph 10.
6
ISA 330, paragraphs 22–23.
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Amount of Difference of Recorded Amounts from Expected Values that Is Acceptable
(Ref: Para. 5(d))
A16. The auditor’s determination of the amount of difference from the expectation
that can be accepted without further investigation is influenced by materiality7
and the consistency with the desired level of assurance, taking account of the
possibility that a misstatement, individually or when aggregated with other
misstatements, may cause the financial statements to be materially misstated.
ISA 330 requires the auditor to obtain more persuasive audit evidence the higher
the auditor’s assessment of risk.8
Accordingly, as the assessed risk increases, the
amount of difference considered acceptable without investigation decreases in
order to achieve the desired level of persuasive evidence.9
Analytical Procedures that Assist When Forming an Overall Conclusion (Ref:
Para. 6) 
A17. The conclusions drawn from the results of analytical procedures designed and
performed in accordance with paragraph 6 are intended to corroborate
conclusions formed during the audit of individual components or elements of
the financial statements. This assists the auditor to draw reasonable
conclusions on which to base the auditor’s opinion.
A18. The results of such analytical procedures may identify a previously
unrecognized risk of material misstatement. In such circumstances, ISA 315
requires the auditor to revise the auditor’s assessment of the risks of material
misstatement and modify the further planned audit procedures accordingly.10
A19. The analytical procedures performed in accordance with paragraph 6 may be
similar to those that would be used as risk assessment procedures.
Investigating Results of Analytical Procedures (Ref: Para. 7)  
A20. Audit evidence relevant to management’s responses may be obtained by
evaluating those responses taking into account the auditor’s understanding of
the entity and its environment, and with other audit evidence obtained during
the course of the audit.
A21. The need to perform other audit procedures may arise when, for example,
management is unable to provide an explanation, or the explanation, together
with the audit evidence obtained relevant to management’s response, is not
considered adequate.
7
ISA 320, “Materiality in Planning and Performing an Audit,” paragraph A13.
8
ISA 330, paragraph 7(b).
9
ISA 330, paragraph A19.
10
ISA 315, paragraph 31.