Objective: This research presents a research model on the effects of work stress and its components: work overload, time pressure and social influence on audit efficiency, taking into account the perceptions of both the financial and tax auditor. Methodology: A partial least squares structural equation model (PLS-SEM) was used on the basis of a total of 240 responses from financial and tax auditors belonging to the Professional Associations of Lima and Callao in Peru. Results: According to the PLS-SEM model, it is suggested that work overload is the most important factor affecting audit efficiency. Time pressure has an impact on the quality of work, as well as social influence on audit efficiency and its components: quality of work and employee welfare. Research Implications: Further research could address the evolution of the effects of the variables. Also, cross-cultural research should be considered, considering other cities in Latin America. Practical Implications: Senior management and boards of audit firms should consider constructing a career path that encompasses the variables investigated and their impact over time on the auditor's career. Originality/value: The study contributes to the development of scientific literature on the characteristics of financial and tax auditing in Peru and the behavior of auditors.