Hello. First of all, I apologize for my poor English. Here, I would like to ask for your help regarding capitalized costs and their depreciation methods. Suppose Company A owns an asset with an estimated useful life of 5 years, and depreciation has been recorded for two years. In the middle of the third year, Company A decides to improve the asset and assesses that the asset's useful life can be extended by one more year. The question is: how should the depreciation expense be calculated after the improvement? Should Company A recalculate depreciation from the first year over a total of 6 years, or only over the remaining 4 years? It would be very helpful if you could provide relevant textbook or journal sources, because I tried to search but could not find them, and I would consider purchasing them. Thank you.

Regarding the above question, accounting treatment usually involves the capitalization of 'asset improvements' and subsequent depreciation. According to general accounting standards (such as IFRS or Chinese Accounting Standards for Business Enterprises), when improvement expenditures meet the capitalization criteria (i.e., they increase future economic benefits), they should be added to the asset's carrying amount, and the remaining useful life should be reassessed.

The key lies in determining the depreciation base. After the improvement, the asset's carrying amount (original cost minus accumulated depreciation plus improvement expenditures) should be systematically allocated over the new remaining useful life. In this example, the original useful life was 5 years, 2 years have been used, leaving 3 years; after the improvement, the life is extended by 1 year, so the new remaining useful life is 4 years (calculated from the time of the improvement). Therefore, depreciation expense should be based on the improved carrying amount and recognized over the remaining 4 years, rather than recalculated from the first year over 6 years.

However, if the improvement occurs in the middle of the third year, it is necessary to consider that depreciation before the improvement has already been recorded according to the original plan, and only future periods should be recalculated after the improvement. The specific calculation steps are:

  • Determine the accumulated depreciation before the improvement (depreciation for the first two years and from the beginning of the third year to the date of the improvement).
  • Calculate the carrying amount after the improvement = original cost - accumulated depreciation + improvement expenditures.
  • Determine the new remaining useful life (in this example, 4 years, starting from the completion date of the improvement).
  • Annual depreciation amount = carrying amount after the improvement ÷ remaining years (if the residual value is not zero, deduct the residual value).

Therefore, the correct treatment is to calculate only over the remaining 4 years (i.e., the remaining life after the improvement), rather than over 6 years from the first year. However, it should be noted that if the improvement expenditure is not capitalized (e.g., it is only routine maintenance), the asset's carrying amount should not be adjusted, and depreciation should continue according to the original plan.

Regarding reference materials, it is recommended to consult the provisions on subsequent expenditures and depreciation in 'International Accounting Standard 16 - Property, Plant and Equipment' (IAS 16), or China's 'Accounting Standard for Business Enterprises No. 4 - Fixed Assets' and its application guide. In addition, common intermediate financial accounting textbooks (such as 'Intermediate Financial Accounting' or 'Principles of Accounting') usually have a chapter on 'subsequent expenditures of assets' that provides detailed examples. If you need journal articles, you can search for academic literature related to 'asset improvement depreciation' or 'capitalized expenditure depreciation'.

I hope the above analysis can help you understand. If further discussion is needed, you are welcome to provide specific data or scenarios.