在財務會計準則公報第10號新修訂「存貨之會計處理準則」發布前，存貨評價產生之存貨跌價損失係單獨列示於營業外損益項下，然而新公報的發佈則是要求將存貨跌價損失列入銷貨成本的項目，進而影響營業淨利的計算。有鑑於過去研究指出營業內盈餘項目的持續性高於營業外的盈餘項目，因而本研究首先欲探討存貨跌價損失的盈餘持續性相較於營業淨利而言是否較低。其次，本研究探討新公報將存貨跌價損失改納入銷貨成本項下，是否會降低對未來盈餘的預測。本研究以2001到2005年間有發生存貨跌價損失之上市公司為研究對象，實證結果發現：存貨跌價損失的盈餘持續性顯著低於營業淨利的盈餘持續性；此外，新公報將存貨跌價損失合併於營業淨利中計算的作法，將導致盈餘組成要素對公司未來績效的預測力顯著地下降。

On 2007, Taiwan’s Financial Accounting Standards Committee of the Accounting Research and Development Foundation revised SFAS No. 10 “The Accounting for Inventory”. The new revised accounting standard came effective in the financial year ending after December 31, 2008. Before the new revised Taiwan’s SFAS No.10, the inventory valuation loss is an item belongs to non-operating income. The revised Taiwan’s SFAS No. 10 asks reclassification inventory valuation loss from non-opearting item to the cost of goods sold. Prior literatures indicate that the perstence of non-operating income items are lower than operating income items. Therefore, our study wants to investigate whether the earnings persistence of inventory valuation loss is lower than operating income. Beside, we want to examine whether the reclassification of inventory valuation loss would reduce the earnings predictability. For a sample of cross-sectional data of firms listed on the Taiwan Stock Exchange (TSE) from 2001 to 2005, we find that the persistence of inventory valuation loss is significantly lower than operating income. The reclassification of inventory valuation loss from non-opearting item to the cost of goods sold would reduce the earnings predictability.

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