Practical guidance for UK businesses expanding internationally, covering group reporting, local regulations, and consolidations.

For many UK businesses, international expansion represents the natural next step in growth – access to new markets, diversified revenue, and competitive advantage on a global stage. But with that ambition comes a layer of complexity that catches many unprepared: the challenge of managing audit obligations across multiple jurisdictions simultaneously.


The regulatory landscape has changed considerably in recent years. The revised ISA (UK) 600 standard, effective for accounting periods commencing on or after 15 December 2023, has fundamentally altered how group audits must be conducted. At the same time, local reporting requirements in overseas markets bear little resemblance to UK norms, and the consequences of getting it wrong – missed deadlines, qualified opinions, or regulatory sanctions – can be significant. This article sets out the key pitfalls to avoid and the practical steps UK businesses should take to stay ahead.

Why group audits get harder when you go international

The audit of a UK parent with overseas subsidiaries has never been straightforward. But the introduction of the revised ISA (UK) 600 has made the relationship between group and component auditors more demanding – and more transparent – than ever before.

New rules, more responsibility: What UK finance directors need to know

Under the revised standard, effective for most businesses with a 31 December 2024 year-end, the group engagement partner carries direct responsibility for the quality of work performed by component auditors in overseas jurisdictions. This is a significant shift. Previously, group auditors could place reliance on summaries or reports from component firms without extensive challenge. That is no longer sufficient.

Key changes include:

  • A proactive, risk-based approach to group audit planning – the group auditor must identify and respond to risks at the group financial statement level, not simply at the level of individual entities.
  • The removal of the concept of ‘significant components’, replaced by a broader framework requiring the group auditor to assess all parts of the group in light of identified risks.
  • Component auditors are now formally part of the engagement team, meaning the group engagement partner is responsible for directing, supervising, and reviewing their work from the outset of the engagement.
  • Robust two-way communication between group and component auditors is now a standard requirement – the group auditor cannot simply issue instructions and wait for results.
  • Enhanced documentation requirements covering how the group engagement partner has reached conclusions on areas of significant judgement.

As noted by ICAEW’s Audit and Assurance Faculty, this means that earlier and more frequent engagement with component auditors is essential. Retrospective reviews of component work will not meet the requirements of the revised standard.

Regulatory context

  • ISA (UK) 600 (Revised) is effective for audits of group financial statements for periods beginning on or after 15 December 2023.
  • ICAEW’s Audit and Assurance Faculty published comprehensive guidance -‘Auditing in a Group Context’ – in August 2025 to help auditors navigate the changes.

FRC inspections have consistently identified group audits – particularly those involving UK holding companies with substantial foreign operations – as a persistent area of concern in audit quality monitoring reports.

Every country has different rules. Here’s where UK companies often get caught out

One of the most significant challenges for UK businesses expanding internationally is the sheer variety of local audit and accounting requirements they encounter. What is standard practice in the UK may be irrelevant – or even inconsistent with – requirements in the jurisdictions where subsidiaries operate.

The filing deadlines, local GAAP and language rules that catch groups off guard

The development of country-specific audit and accounting standards is shaped by a complex interplay of local legal environments, capital markets, financing structures, tax regimes, and business dynamics. For groups operating across multiple jurisdictions, this can make consolidated reporting incredibly complicated, particularly when presenting a unified view of financial performance to investors and lenders.

Some of the most common regulatory differences UK businesses encounter include:

Local statutory requirements

  • Filing deadlines that differ significantly from UK norms – often shorter
  • Local GAAP requirements that may not align with IFRS used in the group consolidation
  • Different definitions of what constitutes a statutory audit
  • Language requirements – financial statements and audit reports may need to be filed in the local language
  • Some jurisdictions (notably the US) do not require a formal subsidiary audit, creating additional burden for the group auditor

Common compliance pitfalls

  • Underestimating filing timelines and leaving insufficient time for local audit sign-off
  • Assuming IFRS-based group accounts satisfy local statutory requirements
  • Appointing local auditors without verifying their quality management systems comply with ISQM 1
  • Failing to obtain the ethical confirmations now required from component auditors under ISA (UK) 600
  • Poor communication between local management and the UK group audit team leading to scope gaps

Simplifying overseas subsidiary reporting: What your options actually are

A common approach for UK groups reporting under IFRS is to use FRS 101 (Reduced Disclosure Framework) for UK subsidiaries. This allows those entities to prepare IFRS-based accounts without the full disclosure requirements of complete IFRS, simplifying the consolidation process. However, for overseas subsidiaries, the position is more nuanced -local GAAP requirements take precedence for statutory filing purposes, which can mean maintaining parallel sets of financial information.

Businesses should address these complexities in their planning well before year-end, not as a last-minute exercise.

Group consolidation errors: The costly mistakes UK finance teams keep making

Consolidation is one of the most technically complex aspects of group reporting, and it is also one of the areas where ICAEW’s Quality Assurance Department has consistently found errors in audit monitoring reviews. Common issues include:

  • Consolidation adjustments not properly evidenced or audited, particularly where they simply replicate prior year adjustments without fresh audit evidence.
  • Goodwill and intangible assets arising on business combinations not assessed for impairment, or impairment reviews not sufficiently tested by auditors.
  • Missing elements in consolidated financial statements – including parent company balance sheets – in what appear to be straightforward domestic group audits.
  • Intragroup transactions and balances not properly eliminated, particularly in multi-tier group structures.
  • Aggregation risk not adequately considered – where individually immaterial misstatements across components combine to create a material error at group level.

The revised ISA (UK) 600 has sharpened the focus on these issues. The revised definition of the consolidation process now explicitly includes the aggregation of financial information across business units – not just legal entities. This is a meaningful change for groups with complex operational structures that do not neatly follow their corporate hierarchy.

Good practice in consolidation auditing

  • Establish a group reporting pack at the outset with clear instructions to all components on accounting policies, intercompany transaction treatment, and required supporting schedules.
  • Agree timetables with all component auditors at planning stage, building in sufficient time for the group engagement team to review and challenge component work before forming a group opinion.
  • Treat impairment reviews as a live, substantive exercise — not a box-ticking exercise carried forward from prior years.
  • Document the rationale for all significant judgements at group level, as required under the enhanced documentation standards of the revised ISA (UK) 600.
  • Consider whether the group’s IT systems adequately support the consolidation process and the extraction of data for audit purposes.

Why leaving audit planning too late costs UK groups time and money

Many of the difficulties that UK businesses face in cross-border audits stem not from technical complexity alone, but from insufficient planning. The expanded requirements of the revised ISA (UK) 600 make this point more urgently than ever – by the time audit fieldwork commences, the foundations for a successful group audit should already be in place.

Start conversations with overseas auditors earlier than you think you need to

Group engagement partners are now required to be involved with component auditors from the start of the planning process. This means:

  • Confirming the competence and capabilities of component auditors before accepting or continuing an engagement – including their compliance with ISQM 1 and, for UK purposes, the FRC Ethical Standard.
  • Agreeing the scope of work, timetables, and reporting formats with component auditors early, rather than as an afterthought.
  • Ensuring that access to component auditor working papers is agreed upfront, as the revised standard makes clear that group auditors cannot simply rely on summaries.
  • Identifying risks at the group level first, and then considering how those risks manifest in individual components – rather than building a group risk assessment from the bottom up.

Filing deadlines abroad won’t wait for your UK year-end timetable

For UK businesses with overseas operations, the timing pressures of a multi-jurisdiction audit can be acute. Subsidiaries in different jurisdictions may have non-coterminous year-ends, which adds complexity to the consolidation timeline. Local statutory filing deadlines -sometimes as short as three months after year-end – can conflict with the group reporting schedule.

Proactive planning should include a mapping of all statutory filing requirements across every jurisdiction in which the group operates, with deadlines clearly built into the audit timetable. This is not a detail that can be left to subsidiary management – it requires central coordination.

One audit network vs separate local firms: Why it matters for UK Groups

For UK businesses with international operations, the choice of audit arrangements is not simply a compliance matter – it is a strategic one. The difference between a fragmented, country-by-country audit approach and a coordinated, network-based model can be substantial, both in terms of quality and the insight that management receives.

The hidden costs of using unconnected local auditors in each country

When a UK group appoints unconnected local audit firms in each jurisdiction, the group engagement partner faces a significant challenge. They are required, under the revised ISA (UK) 600, to direct and supervise the work of those component auditors, review their working papers, and confirm their compliance with FRC ethical standards. Without an established working relationship and shared quality standards, this is difficult and time-consuming.

There is also a consistency risk. Different local firms may interpret accounting policies differently, apply varying levels of professional scepticism, or produce reporting in formats that are difficult for the group team to use efficiently. The result can be a group audit that is slower, more costly, and less insightful.

How international audit networks like UHY give UK groups a practical edge

International audit networks, of which UHY International is a prominent example, offer a fundamentally different proposition. As a member of the Forum of Firms – committed to the highest international audit standards – UHY International enables member firms to deliver coordinated audit services across multiple jurisdictions within an established framework of shared quality standards and communication protocols.

For UK businesses, working with a firm that is part of such a network means:

  • Local expertise in each country, ensuring that statutory requirements are met and local accounting standards applied correctly – without the group team needing to second-guess local practice.
  • Coordinated group audit methodology, with component auditors working within agreed formats and timescales that support the group engagement team’s requirements under ISA (UK) 600.
  • A single point of contact for group reporting, giving management a clear, consolidated view of financial performance across all operations.
  • Comparable quality standards across all jurisdictions, reducing the risk of inconsistent treatment and the associated compliance failures.
  • Greater efficiency, with network firms able to deliver services comparable in quality to larger firms but at a more competitive price point – a significant consideration for mid-market UK businesses.

In our experience working with UK groups expanding internationally, a coordinated global audit does far more than satisfy a compliance obligation. It enhances credibility with investors, lenders, and other stakeholders. Transparent, reliably audited accounts demonstrate that a business operates with integrity and professionalism – providing confidence in negotiations for funding, partnerships, or acquisitions. For businesses planning further international expansion, robust audit processes signal readiness and sound governance to prospective partners and investors.

Williamson & Croft and UHY International: Our Global Audit Capability

  • countries and over 300 major business centres worldwide — giving our clients direct access to coordinated audit support wherever they operate.
  • UHY is a member of the Forum of Firms, committed to promoting consistent, high-quality cross-border financial reporting and auditing practices globally — standards we uphold in every engagement we coordinate.
  • We specialise in mid-market businesses, listed companies, and PE-backed ventures — clients who need both the agility of a responsive local firm and the reach of a global network.
  • Through our UHY membership, we can coordinate group and subsidiary audits, IFRS and ISA reporting, ESG assurance, and statutory compliance across multiple jurisdictions — managed through a single relationship with our team.

If your business is expanding internationally and you want to understand what coordinated group audit support looks like in practice, speak to our audit and assurance team.

A UK Finance Director’s cross-border audit checklist

Whether a business is considering its first overseas acquisition or managing an established international group, the following actions will reduce audit risk and support a more effective cross-border reporting process:

  • Map your audit obligations across all jurisdictions at the start of each financial year  including local statutory filing deadlines, required accounting standards, and language requirements

Don’t wait until after year-end to discover that a subsidiary in Germany or Singapore has a three-month filing window that conflicts with your group timetable.

  • Appoint component auditors early and through a coordinated selection process

Wherever possible, select component auditors who are part of your group auditor’s international network. This facilitates the two-way communication, shared quality standards, and working paper access that the revised ISA (UK) 600 requires.

  • Establish a group reporting pack and distribute it to all components before year-end fieldwork begins

The pack should cover accounting policies, intercompany transaction requirements, consolidation schedules, and reporting timelines. Leaving this until after year-end creates unnecessary delay and risk.

  • Bring the group engagement partner and key component auditors together at the planning stage

Under the revised standard, retrospective review is insufficient. Early joint planning meetings – even conducted remotely – are now best practice and reduce the risk of misaligned expectations at completion.

  • Review your group’s internal financial reporting infrastructure

As ICAEW has observed, group structures are growing more complex and the demands on consolidation processes are more labour-intensive than ever. Businesses that invest in systems capable of producing timely, accurate financial information from all components will find the audit process significantly smoother.

  • Consider the audit implications of overseas acquisitions before they complete

An acquisition that brings a subsidiary into the group mid-year, with its own incumbent local auditors and reporting timetable, can significantly complicate the first consolidated audit. Factoring audit transition into acquisition due diligence is a practical safeguard.

Conclusion

International expansion creates real opportunities for UK businesses – but the audit and compliance obligations that come with it are substantial and growing more complex. The revised ISA (UK) 600 has raised the bar for group audit quality, placing greater responsibility on group engagement partners and demanding a level of coordination with component auditors that many businesses and their advisers are still adjusting to.

The businesses that navigate this landscape most effectively are those that plan ahead -mapping their audit obligations early, appointing experienced component auditors through coordinated networks, and investing in the internal reporting infrastructure that underpins a well-run group audit. As members of UHY International, we are well-placed to support UK businesses at every stage of that journey: from planning the first overseas audit to managing a mature multi-jurisdiction group, with local expertise in each country embedded within a global quality framework.

In a world where audit quality is under increased scrutiny from regulators and investors alike, proactive planning and the right audit partner can make all the difference.

Expanding internationally?

Talk to UHY Williamson Croft about coordinated group audit support through our UHY international membership.