FRC: Final Revisions UK Auditor's Expert Standards Published

• The Financial Reporting Council (FRC) published final revisions to one UK auditing and one UK assurance standard on September 23, 2026.
• These revised standards will be effective for audits of financial statements for periods commencing and assurance reports dated on or after December 15, 2026.
• The revisions aim to maintain alignment with international standards from the IAASB and ensure interoperability with the IESBA Code.
• The updated standards introduce explicit ethical requirements for using the work of external experts in audit, assurance, and non-assurance engagements.
• The FRC supports international alignment to reduce company costs and enhance the quality and consistency of audit and assurance.

For legal professionals advising companies or auditors, understanding these revised UK standards is paramount.

The Financial Reporting Council (FRC) announced on September 23, 2026, the publication of final revisions to its UK standards governing the use of an auditor's expert. These significant updates affect one UK auditing standard and one UK assurance standard, marking a crucial development for audit and assurance professionals. The FRC final revisions UK auditor's expert standards are designed to enhance the quality and consistency of engagements where external expertise is utilized.

A primary driver behind these revisions to the Financial Reporting Council UK standards is the FRC's commitment to maintaining alignment with equivalent international standards issued by the International Auditing and Assurance Standards Board (IAASB). The FRC strongly advocates for such IAASB international standards alignment, believing that a unified set of standards across multiple jurisdictions significantly reduces the cost burden for companies in fulfilling their reporting and audit obligations. This approach also fosters greater quality and consistency in both audit and assurance practices.

Furthermore, these updated UK auditing standards auditor's expert and UK assurance standards auditor's expert ensure interoperability with the International Code of Ethics for Professional Accountants, known as the IESBA Code. This international code introduced explicit ethical requirements specifically for engagements involving external experts, encompassing audit, assurance, and even non-assurance services. The FRC's revisions reflect these global ethical benchmarks, reinforcing the integrity of professional services in the UK.

The core of the FRC's recent updates centers on establishing explicit ethical requirements for using the work of external experts. This means that auditors and assurance providers will need to adhere to a more defined ethical framework when engaging specialists from outside their immediate teams. These auditor's expert ethical requirements 2026 are a direct response to the evolving landscape of professional ethics and the increasing reliance on specialized knowledge in complex engagements.

The revisions ensure that the ethical considerations surrounding the involvement of an IESBA Code external experts UK are clearly articulated and enforceable. This move is expected to bolster public trust in audit and assurance outcomes by ensuring that all parties contributing to an engagement operate under stringent ethical guidelines.

For legal professionals advising companies or auditors, understanding these revised UK standards is paramount. The effective date of December 15, 2026, means that firms must begin preparing now to ensure full compliance with the updated requirements for using external experts in audit and assurance engagements. This includes a thorough review of existing policies and procedures to align with the new ethical considerations and international best practices.

Adherence to these FRC final revisions UK auditor's expert standards will be critical for maintaining regulatory compliance and upholding the quality of financial reporting and assurance. Lawyers should proactively guide their clients through these changes, emphasizing the importance of robust governance and ethical oversight when engaging external specialists.

Lawyers advising companies or auditors should be aware of these revised UK standards, effective 15 December 2026, to ensure compliance with updated requirements for using external experts in audit and assurance engagements, particularly concerning ethical considerations and alignment with international best practices.

Source: Original reporting via FRC