法令翻訳 http://www.japaneselawtranslat...ky=&page=3

(譲渡所得の金額の計算上控除する取得費)
第三十八条  譲渡所得の金額の計算上控除する資産の取得費は、別段の定めがあるものを除き、その資産の取得に要した金額並びに設備費及び改良費の額の合計額とする。

Acquisition Costs Deducted to Calculate Capital Gains
Article 38  Except as provided otherwise, the asset acquisition costs that are deducted to calculate capital gains are the sum total of the amount needed to acquire the assets plus the amounts of equipment expenses and improvement expenses.一  その資産が不動産所得、事業所得、山林所得又は雑所得を生ずべき業務の用に供されていた期間第四十九条第一項（減価償却資産の償却費の計算及びその償却の方法）の規定により当該期間内の日の属する各年分の不動産所得の金額、事業所得の金額、山林所得の金額又は雑所得の金額の計算上必要経費に算入されるその資産の償却費の額の累積額(i)  any period during which the assets are used in business operations that are meant to generate real property income, business income, timber income, or miscellaneous income:the cumulative amount of the depreciation allowances for those assets which, pursuant to the provisions of Article 49, paragraph (1) (Calculating Depreciation Allowances for Depreciable Assets; Depreciation Methods), are included in necessary expenses that are used to calculate the real property income, business income, timber income, or miscellaneous income for each of the years that contain days within that period;二  前号に掲げる期間以外の期間第四十九条第一項の規定に準じて政令で定めるところにより計算したその資産の当該期間に係る減価の額(ii)  any period other than as set forth in the preceding item:the amount of depreciation in those assets during that period, as calculated pursuant to Cabinet Order and in accordance with the provisions of Article 49, paragraph (1).

譲渡所得の基因となる資産が家屋その他使用又は期間の経過により減価する資産である場合には、前項に規定する資産の取得費は、同項に規定する合計額に相当する金額から、その取得の日から譲渡の日までの期間のうち次の各号に掲げる期間の区分に応じ当該各号に掲げる金額の合計額を控除した金額とする。

If an asset generating capital gains is a house or other asset that depreciates due to use or with the passage of time, the asset acquisition costs provided for in the preceding paragraph are the amount arrived at when the sum total of the amounts set forth in each of the following items for the category of period between the acquisition date and the transfer date which is set forth in the item is deducted from an amount equal to the sum total provided for in the preceding paragraph:一  その資産が不動産所得、事業所得、山林所得又は雑所得を生ずべき業務の用に供されていた期間第四十九条第一項（減価償却資産の償却費の計算及びその償却の方法）の規定により当該期間内の日の属する各年分の不動産所得の金額、事業所得の金額、山林所得の金額又は雑所得の金額の計算上必要経費に算入されるその資産の償却費の額の累積額(i)  any period during which the assets are used in business operations that are meant to generate real property income, business income, timber income, or miscellaneous income:the cumulative amount of the depreciation allowances for those assets which, pursuant to the provisions of Article 49, paragraph (1) (Calculating Depreciation Allowances for Depreciable Assets; Depreciation Methods), are included in necessary expenses that are used to calculate the real property income, business income, timber income, or miscellaneous income for each of the years that contain days within that period;二  前号に掲げる期間以外の期間第四十九条第一項の規定に準じて政令で定めるところにより計算したその資産の当該期間に係る減価の額(ii)  any period other than as set forth in the preceding item:the amount of depreciation in those assets during that period, as calculated pursuant to Cabinet Order and in accordance with the provisions of Article 49, paragraph (1).