Internal auditors routinely do work, both on their own
as well as at the request of external auditors, involving
each of the three types of procedures. They often evaluate
and monitor internal control systems. As for procedures
performed to assess audit risk, internal audit work could
influence the overall assessment of risk at the financial
statement level. In assessing control risk, the procedures
to test controls at the account balance or transaction level
may be influenced by internal auditors’ control testing.
Internal audit procedures can provide evidence to enable
external auditors to assess a lower detection risk so that
substantive testing can be reduced or changed in terms
of timing. SAS No. 65 emphasizes that, even though the
external auditor may use the work of the internal auditor,
ultimately the responsibility to assess risks, materiality,
sufficiency of tests, evaluation of estimates, and expressing
audit opinions rests with the external auditor and cannot
be shared with internal auditors. The following sections
provide detail about the three general classes of procedures
listed above, as well as the degree to which external
auditors rely on internal auditing and which factors impact
this reliance.
Internal auditors routinely do work, both on their own
as well as at the request of external auditors, involving
each of the three types of procedures. They often evaluate
and monitor internal control systems. As for procedures
performed to assess audit risk, internal audit work could
influence the overall assessment of risk at the financial
statement level. In assessing control risk, the procedures
to test controls at the account balance or transaction level
may be influenced by internal auditors’ control testing.
Internal audit procedures can provide evidence to enable
external auditors to assess a lower detection risk so that
substantive testing can be reduced or changed in terms
of timing. SAS No. 65 emphasizes that, even though the
external auditor may use the work of the internal auditor,
ultimately the responsibility to assess risks, materiality,
sufficiency of tests, evaluation of estimates, and expressing
audit opinions rests with the external auditor and cannot
be shared with internal auditors. The following sections
provide detail about the three general classes of procedures
listed above, as well as the degree to which external
auditors rely on internal auditing and which factors impact
this reliance.
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