Chapter 06 – Internal Control in a Financial Statement Audit
6-3
6-6 In addition to planning the audit of the financial statements, the auditor’s understanding of
the entity’s internal control is used to (1) identify the types of potential misstatements, (2)
controls and substantive procedures.
6-7 The concept of reasonable assurance recognizes that the cost of an entity’s internal control
system should not exceed the benefits that are expected to be derived from the system.
Thus, an internal control system will not detect every error that might occur because it
personnel errors or mistakes, and collusion are inherent limitations of internal control.
6-8 A number of tools are available to the auditor for documenting the understanding of the
6-9 The auditor should document the achieved level of control risk for the controls evaluated.
The auditor’s assessment can be documented using a structured working paper, an internal
control questionnaire, or a memorandum.
6-10 The auditor might consider conducting substantive tests at an interim date for a number of
reasons. For example, the client may want the auditor to confirm accounts receivable
before year-end because of demands on the client’s staff at year-end. Alternatively, the
auditor may wish to conduct substantive tests at an interim date to minimize staff overtime
at year-end. The auditor should consider the following factors when substantive tests are
to be completed at an interim date:
• The control environment and other relevant controls.
reduce the risk that misstatement may exist at the period-end will not be detected.
When the auditor conducts substantive tests of an account at an interim date, additional
substantive tests might include comparing the year-end account balance with the interim
account balance, conducting some analytical procedures, and/or reviewing related journals
and ledgers for large or unusual transactions during the remaining period.
6-11 For private companies, auditing standards require that the auditor report to those charged
with governance (e.g., audit committee) any control deficiencies discovered by the auditor