Article 29Calculation of Cost of Sales of Inventories and Valuation Method
第二十九条（棚卸資産の売上原価等の計算及びその評価の方法）
When, with regard to a domestic corporation's inventory, calculating the amount to be included in deductible expenses in each business year in the calculation of the amount of income for the business year, pursuant to the provisions of Article 22, paragraph (3) (The Amount to be Included in Deductible Expenses in Each Business Year), the value of the inventory held by the domestic corporation as of the end of the business year that is used as the basis of the calculation (hereinafter referred to as the "closing inventory" in this paragraph) is to be the amount evaluated based on the valuation method that the domestic corporation selected for the closing inventory from among the method of treating the average acquisition cost of inventory as the fair value of the inventory held as of the end of the business year and other valuation methods specified by Cabinet Order (in the case where the domestic corporation did not select any valuation method or did not evaluate the inventory based on the valuation method of their choice, the amount evaluated based on one of the valuation methods specified by Cabinet Order).
内国法人の棚卸資産につき第二十二条第三項（各事業年度の損金の額に算入する金額）の規定により各事業年度の所得の金額の計算上当該事業年度の損金の額に算入する金額を算定する場合におけるその算定の基礎となる当該事業年度終了の時において有する棚卸資産（以下この項において「期末棚卸資産」という。）の価額は、棚卸資産の取得価額の平均額をもつて事業年度終了の時において有する棚卸資産の評価額とする方法その他の政令で定める評価の方法のうちからその内国法人が当該期末棚卸資産について選定した評価の方法により評価した金額（評価の方法を選定しなかつた場合又は選定した評価の方法により評価しなかつた場合には、評価の方法のうち政令で定める方法により評価した金額）とする。
Cabinet Order provides for special provisions on the selectable valuation methods referred to in the preceding paragraph, the way of selecting a valuation method, the acquisition cost of inventory to be used as the basis of the calculation of the fair value of inventory, and other necessary particulars concerning the valuation of inventory.