What is Audit Evidence? Recall that the auditor’s role is to obtain sufficient appropriate audit evidence to be able to draw reasonable conclusions on which to base their audit opinion. The auditor needs to obtain evidence to support each assertion that management is proposing. What exactly constitutes evidence? Audit Evidence refers to the source documents and accounting records (i.e., ledgers, journals) that support the financial statements and all other information that is pertinent to the audit. In deciding how to collect this evidence, an auditor must plan three important factors: the nature, extent, and timing of the audit evidence