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UK Audit Regulations: are you sure you’re up to date with all recent changes?

A range of amendments to the UK Audit Regulations have been introduced since 1 October 2024. These changes relate to eligibility requirements for audit firm control, new notification rules for some types of audits and a new requirement for sole practice auditors to appoint an alternate. We summarise all of the changes to help you check your firm is up to date with all of the current requirements.

A range of amendments to the UK Audit Regulations have been introduced since 1 October 2024. These changes relate to eligibility requirements for audit firm control, new notification rules for some types of audits and a new requirement for sole practice auditors to appoint an alternate. We summarise all of the changes to help you check your firm is up to date with all of the current requirements.

Eligibility for firm control

ICAEW updated the Audit Regulations to ensure they align with the Companies Act 2006 and the FRC Eligibility Criteria. The amendments focus on confirming that audit firms are genuinely controlled by audit qualified persons.

What changed?

  • Voting rights were redefined to include rights to vote on matters that direct the firm’s overall policy or change its constitution.
  • The definition of ‘majority’ has been clarified to mean more than 50%, unless the firm’s constitution sets a higher threshold (in which case that higher bar applies).

Why this matters

From 1 April 2025, firms must be able to show that audit qualified persons can pass key decisions on policy or constitutional change – a veto alone is not sufficient. Where constitutional voting thresholds exceed 50%, audit qualified persons must be able to reach those higher thresholds.

Tools and guidance

New duty to notify ICAEW about certain relevant audits

ICAEW-registered audit firms must now notify ICAEW within 21 business days when appointed to specific audit engagements that may be complex or high risk.

When notification is required

Notification applies from 1 June 2025 when your firm is appointed as auditor to:

  • a listed entity;
  • an entity with turnover over £750m, or an Other Entity of Public Interest under the FRC Ethical Standard;
  • an audit where the expected first-year fee is more than twice the firm’s previous highest audit fee, subject to a £25k de minimis;
  • a large/complex group (combined turnover over £750m under common ownership/control) where the firm has three or fewer responsible individuals.

Notification is also required where an existing audit engagement starts to meet one or more of the criteria after 1 June 2025.

Notification isn’t needed where firms already notify the FRC (eg, PIE audits).

Waiver option

Firms with significant relevant experience can apply for a waiver from the 21-day requirement and instead notify annually via a template.

Tools and guidance

Sole practice auditors must appoint an alternate

A new regulation (2.02A) requires sole practice audit firms to appoint an alternate to ensure continuity if the sole auditor cannot practise. This applies to sole traders and corporate firms with one director.

Key points

  • The alternate can be a member of ICAEW, ICAS, CAI or ACCA.
  • They do not need to be a responsible individual or hold a practising certificate.
  • The role is to support continuity/transition, not to take on audit work.

A number of firms have not told us about their alternate

The deadline to appoint an alternate was 1 December 2025 and sole practice auditors need to inform us of their alternate’s details. Our current list of alternates is incomplete. Sole practice auditors should complete the form to notify us of their alternate’s details as soon as possible so that we can confirm they are compliant.

Tools and guidance

Current Audit Regulations

Current Audit Regulations

Review the current UK Audit Regulations

Read the regulations