Subsidiary audit exemption with a parent guarantee

Section 479A of the Companies Act 2006 lets a subsidiary of any size skip its statutory audit for a year if its UK parent guarantees it, all its members agree, and it is included in the parent’s audited consolidated accounts. The price is high: under section 479C the parent guarantees every liability the subsidiary has at the year end until it is paid in full, and any creditor can enforce that guarantee directly.

Which subsidiaries can use the exemption?

Section 479A(1) applies to a company that is itself a subsidiary undertaking whose parent undertaking is established under the law of any part of the United Kingdom. ICAEW’s Technical Release TECH 06/20BL confirms there is no size limit: a large trading subsidiary can qualify just as a small one can. That is the main difference from the small company audit exemption, which a subsidiary can only use if the whole group is small.

Section 479B excludes a company that, at any time in the financial year, was:

a traded company as defined in section 474(1);
an authorised insurance company, a banking company, an electronic money issuer, a MiFID investment firm or a UCITS management company, or a company carrying on insurance market activity or acting as a scheme funder of a Master Trust pension scheme; or
a special register body or an employers’ association under the trade union legislation.

ICAEW notes that these exclusions turn on the status of the subsidiary itself. There is no ineligible group concept here, so a subsidiary of an insurer can still qualify if it is not itself an insurer.

What conditions must be met for each year?

Section 479A(2) lists five conditions, and all must be satisfied for the financial year concerned:

all members of the subsidiary agree to the exemption for that year;
the parent gives a guarantee under section 479C for that year;
the subsidiary is included in consolidated accounts drawn up by the parent for that year (or to an earlier date in that year) under Part 15 of the Act, the equivalent legal requirements for a parent that is not a company, or UK adopted international accounting standards;
the parent discloses in the notes to those consolidated accounts that the subsidiary is exempt from audit under section 479A; and
the subsidiary’s directors deliver to Companies House, on or before the date they file the subsidiary’s accounts, written notice of the members’ agreement, the parent’s guarantee statement, and copies of the consolidated accounts, the auditor’s report on them and the consolidated annual report.

The guarantor need not be the ultimate parent. ICAEW explains that an intermediate parent can give the guarantee, but it must then prepare consolidated accounts that include the subsidiary.

How do the members agree?

Consent must be unanimous. ICAEW points out that members include the immediate parent, holders of preference or non voting shares, and holders of shares presented as liabilities for accounting purposes, because the Act looks at legal membership. There is no prescribed form; a written resolution signed by all members is satisfactory evidence. Consent should be given for each year separately, as the Act requires agreement for the financial year in question, and ICAEW warns that giving it in advance on a rolling basis risks a challenge to its validity.

The exemption is also subject to section 476. Members holding at least 10% in nominal value of the issued share capital, or of any class of it, can require an audit by notice given during the financial year and no later than one month before it ends.

What does the parent guarantee actually commit it to?

Under section 479C(3) the parent guarantees all outstanding liabilities to which the subsidiary is subject at the end of the financial year concerned, until they are satisfied in full, and the guarantee is enforceable against the parent by any person to whom the subsidiary is liable for those liabilities. ICAEW stresses several consequences:

The guarantee is created by statute when the statement is delivered to Companies House. No contract with creditors is needed, and creditors do not need to know about it in advance.
The scope of outstanding liabilities is a legal question. If insolvency law meanings apply, it could include contingent and prospective liabilities, such as a pending legal claim or future lease rentals. ICAEW advises groups to map the subsidiary’s full liabilities, including those, before giving the guarantee.
For a running account such as an overdraft, the rule in Clayton’s case may mean later repayments discharge the earliest debits first, so the balance guaranteed can run down as the account turns over.
There is no mechanism to revoke the guarantee or transfer it. If the parent sells the subsidiary, it stays liable for the guaranteed balances until they are settled, and can at most seek an indemnity from the buyer.
Deciding later to have an audit for that year does not cancel a guarantee already given.

Directors of the parent should check that they have power to give the guarantee and weigh it against their general duties, a point ICAEW makes expressly. The issues are similar to those in our guide to intra group guarantees and corporate benefit.

What has to be filed, and when?

The guarantee statement under section 479C(2) must be authenticated by the parent and give the parent’s name and registered number (if any), the subsidiary’s name and registered number, the date of the statement and the financial year covered. Companies House form AA06 is the statement of guarantee by a parent undertaking, and ICAEW notes that the form must be signed on behalf of the parent. The members’ notice of agreement has no prescribed form, but should show the subsidiary’s name and registered number prominently.

The formalities do not have to be completed before the year end, only by the time the accounts are filed. In practice the decision comes much earlier, because the parent’s consolidated accounts must name the exempt subsidiary and the group auditor needs to know whether to plan a full statutory audit or only group reporting work.

The subsidiary’s own balance sheet must carry the statements required by section 475(2) and (3): that it is entitled to the exemption under section 479A, that the members have not required an audit under section 476, and that the directors acknowledge their responsibilities for accounting records and preparing accounts. The statements must appear above the director’s signature.

How does it work in practice?

Illustration only. A UK holding company owns 100% of a distribution subsidiary with a 31 March year end. At 31 March 2026 the subsidiary owes £2 million to trade creditors, £500,000 on an overdraft and has a five year warehouse lease.

In January 2026 the group decides to use section 479A for the year to 31 March 2026, and the parent’s directors review the subsidiary’s liabilities, including the lease, before approving the guarantee.
The parent signs a written resolution as sole member and signs form AA06.
The consolidated accounts note that the subsidiary is exempt from audit under section 479A.
When the subsidiary files its unaudited accounts, its directors deliver the notice of agreement, form AA06 and copies of the audited consolidated accounts, auditor’s report and annual report.
If the subsidiary later fails, a supplier still unpaid from the 31 March 2026 balance can claim directly against the parent.

When is the exemption a poor fit?

Lenders, regulators or customers may require audited subsidiary accounts regardless, a point ICAEW notes.
A charitable subsidiary still needs any audit required by the Charities Act 2011; section 479A only removes the Companies Act audit.
A charity parent should consider whether charity law allows it to guarantee a trading subsidiary at all, given Charity Commission guidance that the charity’s assets must be protected from trading risk.
A subsidiary with large or uncertain liabilities, such as litigation or long leases, exposes the parent to risk that may outweigh the audit fee saved.

What mistakes come up most often?

Missing a member, often a minority or preference shareholder, so consent is not unanimous.
Filing the subsidiary’s accounts before the AA06, notice and group documents, which breaks the condition in section 479A(2)(e).
Forgetting the disclosure in the parent’s consolidated accounts naming the subsidiary.
Treating the guarantee as covering only the current year’s trading. It attaches to the year end balances and survives a later sale.
Using section 479A for a dormant subsidiary that could instead rely on section 480 or the dormant subsidiary exemptions; see dormant company accounts.

For the wider group picture, see group accounts exemptions.

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Reviewed by Christine Anderson, Broker, Solar Protect. Last reviewed 8 October 2026. Part of Accountapedia, the Solar Protect guide to UK tax and accounting. This page is general information, not personalised advice.