Purpose – Previous studies have demonstrated substantial differences in corporate voluntary disclosure between companies in Hong Kong and China. After the harmonization of accounting standards in both Hong Kong and China, this study aims to see whether previous differences still exist or not. We compare the extent of voluntary disclosure in H-share and Ashare annual reports published by Chinese companies issuing H-shares in Hong Kong and Ashares in China. We also construct a disclosure instrument that can be used to gauge the extent of voluntary disclosure in both H-share and A-share annual reports. Methodology - The disclosure scores from H-share and A-share reports are obtained in pairs and analyzed through paired sample t-tests. Value - This study fills the gap that there is no voluntary disclosure instrument that takes into account new accounting standards in both Hong Kong and China. The disclosure instrument can be applied in future disclosure research. Secondly, this study contributes to the lack of updated studies on the comparison of voluntary disclosure in H-share and A-share annual reports.