Regulations Governing Financial Statement Audit and Attestation Engagements of Certified Public Accountants Article 20

If the audited entity changes an accounting policy, the auditor shall ascertain on an item-by-item basis whether an analysis of reasonableness, and specific evidence, have been provided for matters including pre-change analysis, estimation of the quantitative effect, and peer comparison. If the audited entity has any change in any matter among accounting estimates in relation to a change in the useful life or the depreciation or depletion method of depreciable or depletable assets, a change in the amortization period or amortization method of intangible assets, a change in the residual value of any such assets, or a change in a technique used to estimate the fair value thereof, the CPA also shall comply with the provisions specified above.If the audited entity changes to any new accounting policy, the CPA shall ascertain whether it has applied the change retrospectively; if it is impracticable, the CPA shall ascertain whether it complies with International Accounting Standards 8.