When Does a UK Limited Company Need a Statutory Audit?

The Small Company Audit Exemption

A private limited company is exempt from the statutory audit requirement for a financial year if, in that year (and the previous year, for established companies), it qualifies as small. The small-company thresholds require that the company satisfies at least two of three conditions: annual turnover not more than £10.2 million; gross assets not more than £5.1 million; and not more than 50 employees.

First-year companies only need to meet the conditions in the current year. A company that loses small status in one year loses the exemption in the following year, not immediately — though this depends on which conditions it fails to meet. Confirm your position with your auditor or accountant if your business is growing toward the thresholds.

Companies That Cannot Use the Exemption

Even where the size criteria are met, certain companies cannot claim the audit exemption. These include: public limited companies; companies within an ineligible group (where the parent or subsidiary fails the size test at group level); companies regulated by the FCA or PRA (including banks, insurers, and most financial services firms); charities above a certain income; and community interest companies above a specified threshold.

Subsidiary companies of overseas groups may also face audit requirements imposed by their parent's home jurisdiction. Sole subsidiaries of parent companies that are themselves audited may benefit from the subsidiary audit exemption under Section 479A, but this requires specific conditions to be satisfied and a guarantee from the parent.

When Shareholders or Lenders Demand an Audit

Shareholders holding 10% or more of the share capital can require the company to obtain an audit for a financial year by depositing a notice at the registered office before the year end (or within one month of the year-end for the first year). This right under Section 476 cannot be contracted out of the articles.

Commercial lenders sometimes require audited accounts as a condition of a loan facility, particularly at higher loan values or for property-backed deals. If you are seeking business finance, check whether your lender's terms include an audit covenant — agreeing to provide audited accounts each year — before accepting the facility.

Benefits and Costs of Voluntary Audit

An audit, even where not legally required, can add credibility when tendering for large contracts, dealing with institutional investors, or managing significant trade-credit relationships. Some companies in regulated supply chains (defence, financial services, NHS procurement) find that customers expect audited financials as a condition of doing business.

The cost of an audit varies significantly by company size, sector, and complexity. For a straightforward trading company with clean records, a small-company audit typically runs in the low to mid thousands of pounds. Weigh this against the commercial benefit — an audit undertaken purely for appearances, where no stakeholder has requested it, is unlikely to justify the cost.