Principles-Based Reasoning about Accounting Estimates

This article proposes a key principle and related concepts for reasoning about accounting estimates. The reasoning is consistent with a principles-based professional judgment framework proposed by Ross Skinner and the Institute of Chartered Accountants of Scotland. The principle deals with reasonable ranges and related risk assessments in the audit of accounting estimates. It does so by using concepts first introduced by Boritz and Skinner and updates them for the requirements of CAS/ISA No. 540 and International Financial Reporting Standards. The article identifies the conditions for the existence of the benchmark ranges proposed by Smieliauskas in identifying fairly presented estimates. The need for a professional judgment framework and related guidance has been recognized recently by the International Federation of Accountants, a 2010 EU Green Paper, and the Public Company Accounting Oversight Board as a result of challenges auditors have been facing in the current reporting environment. This recognition echoes calls first made by Ross Skinner in his pioneering 1995 article, and reinforced by the FASB/IASB 2006 proposal for principles-based accounting standards.