Building A Tax Quality Management System: Applying ISQM1 In A Combined Service Practice

From 01 January 2026, audit and assurance practices must implement the International Auditing and Assurance Standards Board (IAASB) International Standard on Quality Management 1 (ISQM1) framework as part of their quality management systems (QMS).

In the Netherlands and many other countries these practices are often combined with tax services. What does ISQM1 mean for a combined or stand-alone tax practice?

From quality control to quality management

ISQM1 applies to firms performing audits, reviews, and related assurance services. Its main goals are to:

1. Strengthen quality systems;
2. Ensure compliance with professional and legal standards; and
3. Foster a culture of quality, ethics, and professional scepticism.