Page 265 - TSMC 2018 Annual Report

Our key audit procedures performed in respect of the above area included the following:
1. Understood and tested the design and operating effectiveness of the key controls over estimate for sales returns and allowances;
2. Understood and assessed the reasonableness of assumptions made and methodology used in estimating sales returns and allowances;
3. Sampled and inspected the sales contracts of main products by agreeing the contractual terms and performed an analysis to challenge the estimation on possibility that specific products could meet business incentives condition to verify the reasonableness of the accrual of the sales returns and allowances;
4. Performed a retrospective review to comparatively analyze the historical accuracy of judgments with reference to actual sales returns and allowance paid.
Timing to commence depreciation of property, plant and equipment (PP&E)
The Company continues to invest in capital expenditures to develop and build capacity in leading-edge technologies to meet customers’ demand. Please refer to Notes 4, 5 and 12 to the parent company only financial statements for the details of the information and accounting policy about the depreciation of PP&E. According to IAS 16, depreciation of PP&E begins when the assets are available for use, and in the condition necessary for the assets to be capable of operating in the intended manner. Due to the significant capital expenditures of the Company, and the criteria to determine whether such assets are available for their intended use vary within categories of assets as well as involve subjective judgments, the validity of the timing to commence depreciation of PP&E could have a material impact on its financial performance. Consequently, the validity of the timing to commence depreciation of PP&E is identified as a key audit matter.
Our key audit procedures performed in respect of the above area included the following:
1. Understood and tested the design and operating effectiveness of the key controls over the timing to commence depreciation of PP&E;
2. Understood the criteria the assets are defined as available for their intended use and the corresponding accounting treatments;
3. Sampled and reviewed the appropriateness of the timing for commencing depreciation after the assets met the criteria of available for use in current year;
4. Performed an observation on the physical count of equipment under installation and construction in progress; sampled and inspected the supporting documentation to verify that the status of equipment under installation and construction in progress are not available for use;
5. Sampled equipment under installation and construction in progress which met the criteria of available for use and were transferred in the subsequent period to evaluate the reasonableness of the timing for commencing depreciation;
6. Sampled and reviewed the appropriateness of the equipment under installation and construction in progress which are not available for their intended use.
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