Auditing and Assurance Standards and Guidance

Auditing Standards (Ireland)

FRC ISAs (UK and Ireland) applicable for periods beginning on or after 15 December 2010 but before 17 June 2016

ISA (UK and Ireland) 540 Auditing, accounting estimates, including fair value accounting estimates, and related disclosures

Application and Other Explanatory Material

Responses to the Assessed Risks of Material Misstatement (Ref: Para. 12 )

Consistency in Methods and Basis for Changes (Ref: Para. 12(b) )

The auditor's consideration of a change in an accounting estimate, or in the method for making it from the prior period, is important because a change that is not based on a change in circumstances or new information is considered arbitrary. Arbitrary changes in an accounting estimate result in inconsistent financial statements over time and may give rise to a financial statement misstatement or be an indicator of possible management bias.

A58.

Management often is able to demonstrate good reason for a change in an accounting estimate or the method for making an accounting estimate from one period to another based on a change in circumstances. What constitutes a good reason, and the adequacy of support for management's contention that there has been a change in circumstances that warrants a change in an accounting estimate or the method for making an accounting estimate, are matters of judgment.