Purpose – This study examines whether joint tenure between the engagement audit partner (EAP) and the chief financial officer (CFO) is associated with audit fees. Extending auditor–client relationship research in Asian capital markets, this study focuses on joint professional continuity rather than informal social ties. Design/methodology/approach – Using a sample of non-financial firms listed on the Stock Exchange of Thailand (SET) from 2016 to 2021, this study estimates a standard audit fee model with firm-level clustered standard errors and industry and year fixed effects. EAP-CFO joint tenure is measured as (i) the consecutive number of years in which both parties simultaneously serve the same client firm and (ii) an indicator of extended joint tenure exceeding the sample mean. Findings – The results show that longer EAP-CFO joint tenure is positively and significantly associated with audit fees. The association remains robust after controlling for individual EAP and CFO tenure and a comprehensive set of client, auditor, and engagement characteristics. The findings suggest that sustained professional interaction between auditors and CFOs is reflected in audit pricing decisions. Originality/value – This study contributes to the Asian auditing literature by introducing joint tenure between EAPs and CFOs as a distinct dimension of the auditor–client relationship. By focusing on audit fees as an observable contracting outcome and leveraging the Thai institutional setting, this study provides new evidence on how professional continuity shapes audit pricing in relationship-oriented Asian capital markets.