Transactions on Economic and Business Models Trang Hong Thi Le, Suong Ngoc Thi Ly, Nhu Huynh Thi Pham 1 1 2025 https://doi.org/10.6025/tbem/2026/1/1/51-67 https://www.dline.info/tebm/fulltext/v1n1/tebmv1n1_5.pdf This study explores the direct and indirect influence of concepts such as accounting standards (AS), accounting disclosure quality (ADQ), sustainability reporting quality (SRQ), and firm performance in ASEAN firms. The data includes 3,211 firm-year observations over the 2019-2023 period collected from Thomson Datastream and analyzed by quantitative tools. The results revealed several important findings. First, AS directly and positively impacts SRQ as well as ADQ. Second, ADQ has a direct and positive impact on firm performance while SRQ exerts a negative influence. Third, AS has an indirect and positive impact on firm performance through the mediation of ADQ and SRQ. The research results contribute to asymmetric information theory as IFRS adoption has reduced information asymmetry, bringing economic benefits to the parties involved in the transaction.