(b) Explain the principal audit procedures to be performed during the final audit in respect of the estimatedwarranty provision in the balance sheet of Island Co as at 30 November 2007. (5 marks)

正确答案：
(b) ISA 540 Audit of Accounting Estimates requires that auditors should obtain sufficient audit evidence as to whether an
accounting estimate, such as a warranty provision, is reasonable given the entity’s circumstances, and that disclosure is
appropriate. One, or a combination of the following approaches should be used:
Review and test the process used by management to develop the estimate
– Review contracts or orders for the terms of the warranty to gain an understanding of the obligation of Island Co
– Review correspondence with customers during the year to gain an understanding of claims already in progress at the
year end
– Perform. analytical procedures to compare the level of warranty provision year on year, and compare actual to budgeted
provisions. If possible disaggregate the data, for example, compare provision for specific types of machinery or customer
by customer
– Re-calculate the warranty provision
– Agree the percentage applied in the calculation to the stated accounting policy of Island Co
– Review board minutes for discussion of on-going warranty claims, and for approval of the amount provided
– Use management accounts to ascertain normal level of warranty rectification costs during the year
– Discuss with Kate Shannon the assumptions she used to determine the percentage used in her calculations
– Consider whether assumptions used are consistent with the auditors’ understanding of the business
– Compare prior year provision with actual expenditure on warranty claims in the accounting period
– Compare the current year provision with prior year and discuss any fluctuation with Kate Shannon.
Review subsequent events which confirm the estimate made
– Review any work carried out post year end on specific faults that have been provided for. Agree that all costs are included
in the year end provision.
– Agree cash expended on rectification work in the post balance sheet period to the cash book
– Agree cash expended on rectification work post year end to suppliers’ invoices, or to internal cost ledgers if work carried
out by employees of Island Co
– Read customer correspondence received post year end for any claims received since the year end.