台灣於2019年強制上市、上櫃公司採用iXBRL申報財務報表，取代由2010年採用的XBRL格式申報。iXBRL格式除繼承XBRL的優點外，亦改善XBRL需要分析軟體才可閱讀的限制，使市場上的資訊使用者在取得資訊上更迅速且便捷。因iXBRL係將XBRL中的標籤嵌入到HTML網頁，故不再需要分析軟體即可由網頁顯示，且HTML目前為成熟之技術，對於軟體開發公司來說可降低軟體的開發成本。 本研究探討公司採用iXBRL格式申報財務報表後，解決散戶無分析軟體解譯XBRL案例文件的困境，對散戶而言分析大量資料更加便利，並降低公司與投資者間的資訊不對稱，散戶持股比率及交易量可能會受影響。本研究期間以2019年強制採用iXBRL為起始，為避免季節性因素影響實證結果，納入2018年為研究期間，研究期間為2018年至2019年第三季，共七季。實證結果顯示：一、採用iXBRL後散戶持股比率會呈現顯著正相關。二、散戶交易量與iXBRL呈現顯著負相關。 ;Taiwan Stock Exchange enforced firms to disclose their financial statements in iXBRL format in 2019 Q1. iXBRL format not only includes XBRL advantages but helps investors read instance documents without XBRL analysis software. It helps investors acquire information in a more efficient and convenient way. In addition, iXBRL format is based on HTML ,which is a mature technology to software development company. It decreases the cost of developing software. This study examines the effect of mandatory iXBRL adoption on individual ownership and trading volume. After adopting iXBRL format to disclose financial statements, it decreases the information asymmetry between companies and small investors. Consequently, the individual ownership and trading volume may be effected. Based on a sample of firms listed on Taiwan Stock Exchange over the period of 2018 to 2019 Q3. The empirical result shows that the adoption of iXBRL may increase individual ownership. Moreover, I find significant negative association between iXBRL adoption and trading volume of individual investors.
