The influence of litigation risk and internal audit source on reliance decisions

External auditor reliance on the work of internal auditors in an integrated audit of the financial statements and internal control is an important audit planning procedure that can impact audit efficiency and effectiveness. The purpose of this study is to examine how perceived auditor litigation risk and internal audit source affect external auditors' reliance decisions in an integrated audit environment under varying levels of risk of material misstatement. In an experimental study using 89 practicing Big 4 auditors, this study finds that auditors who perceive low litigation risk from placing reliance on the work of internal auditors will rely more on outsourced internal auditors than in-house internal auditors. The results also show that auditors' reliance decisions are sensitive to the level of account risk consistent with the risk-based approach to the integrated audit encouraged by the PCAOB. (C) 2010 Elsevier Ltd. All rights reserved.