If your overseas group has a UK subsidiary, understanding the UK subsidiary audit requirements is essential. The rules aren’t always straightforward – some UK subsidiaries must have a statutory audit, others don’t, and getting it wrong can mean penalties or problems with HMRC.
This guide sets out when a UK subsidiary of a foreign parent needs an audit, what exemptions are available under the Companies Act 2006, and what overseas groups should know about the process.
Does a UK subsidiary company need an audit?
It depends on size. Under the Companies Act, all UK companies are subject to audit requirements unless they qualify for a carve-out. The default position is that every subsidiary must have its accounts examined – so it’s important to check whether yours qualifies.
A UK subsidiary needs an audit if it exceeds two of the three small company threshold tests in any financial year:
- Annual turnover above £15 million
- Balance sheet total above £7.5 million
- Average number of employees above 50
If the subsidiary company exceeds two of those three, it must have a statutory audit regardless of what the parent wants. There’s no opt-out for being part of a larger group.
Small companies that fall below all three threshold tests and qualify as small may be exempt from audit – but only if certain conditions are met. Does your UK subsidiary need an audit? For UK subsidiaries of overseas parent companies and worldwide groups, there’s an additional route worth knowing about.
Audit exemption for small UK subsidiaries
Small UK subsidiaries can claim exemption from audit under s477 if they meet the size thresholds above and no shareholders holding at least 10% of shares request a company audit. But there are exclusions. Public entities, certain financial services firms, and those in regulated sectors can’t use this route even if they’re exempt on size grounds.
For UK subsidiaries of overseas groups, size alone doesn’t tell the whole story. The group structure and where the parent is based both matter.
Is Section 479A audit exemption for subsidiary undertaking?
Yes. Section 479A provides a specific exemption for subsidiary companies – including UK subsidiaries of foreign parent companies. This is separate from the small company route and works differently.
Under s479A, a subsidiary can claim this if:
- The parent guarantees all the subsidiary’s outstanding liabilities at year-end
- The subsidiary is included in the consolidated financial statements of the parent
- Those consolidated accounts are prepared in line with EU-adopted IFRS, or to an equivalent standard
- The guarantee and the arrangement are disclosed in the notes to the consolidated accounts
- The subsidiary files the guarantee at Companies House along with a copy of the consolidated accounts
This means even a large UK subsidiary will not require an audit – even one well above the small companies threshold – if the UK parent or overseas parent is willing to guarantee its liabilities and consolidate the subsidiary into group accounts. Many worldwide groups use this route to reduce the compliance burden on their UK operations.
But there are catches. Shareholders holding at least 5% (not 10% as with s477) can still require an audit. And this doesn’t apply to entities that need one for other regulatory reasons.
When foreign parents should consider a UK audit anyway
Even where the exemption is available, some overseas groups choose to have their UK subsidiaries examined. Common reasons include:
- The parent’s own auditor requires verified subsidiary accounts for group consolidation purposes
- Local management want independent assurance over accounts filed with the registrar
- Banks or lenders in the UK require audited accounts as a condition of lending
- The parent’s jurisdiction has reporting requirements that effectively demand audited figures at subsidiary level
- HMRC enquiries are easier to handle when accounts have been independently verified
A voluntary audit of the UK subsidiary can actually save time and money overall if it avoids problems with the group engagement or satisfies lender covenants without further negotiation.
What does the UK subsidiary audit involve?
The audit follows International Standards on Auditing (UK) – the same framework as any other statutory engagement. The auditor examines the subsidiary’s accounts and gives an opinion on whether they show a true and fair view.
For UK subsidiaries of foreign groups, certain areas typically get extra attention:
- Intercompany transactions – transfer pricing, management charges, and loan balances between the subsidiary and parent need proper documentation and arm’s-length justification
- Currency translation – where the subsidiary transacts in currencies other than sterling, the accounting treatment and any hedging arrangements are reviewed
- Tax position – UK corporation tax, withholding tax on dividends to the parent, and any permanent establishment considerations
- Filing obligations – ensuring accounts are filed on time at Companies House and in the correct format
The report is addressed to the subsidiary’s shareholders (typically the foreign parent) and filed alongside the annual accounts.
Choosing an auditor for your UK subsidiary
Your UK subsidiary needs a registered auditor. They must be registered with a Recognised Supervisory Body – in practice, that means firms regulated by the ICAEW, ACCA or ICAS. The parent’s overseas auditor can’t sign the UK report unless they hold UK registration.
Many UK subsidiaries of foreign groups prefer a UK statutory auditor that can coordinate with the parent’s overseas auditor on group reporting timetables. At Audit Group, we regularly act for many UK subsidiaries of overseas parents across Europe, North America and Asia. We’re part of Jack Ross Chartered Accountants, ICAEW-regulated, and experienced in working alongside international firms on group engagements.
If your overseas group needs a UK subsidiary audit or wants advice on whether exemption applies, call us on 0161 832 4451 or visit our contact page.
