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Audits sit at the heart of financial accountability. However, many business owners fail to understand the distinction between legal requirements and audits they choose to commission voluntarily.Understanding the practical difference between statutory and non-statutory audits is important because getting it wrong can have significant consequences, not only for your business but also for your management team and everyone who relies on accurate financial information.
For your audit requirements, it is essential to work with a trusted and experienced auditor. For example, MMBA Accountants is a reputable firm with auditors who have trained and worked within Top 10 and Big Four accounting practices.With extensive experience across a wide range of industries, the team has helped businesses throughout the UK meet their audit and compliance obligations with confidence.Having a credible and professional audit expert by your side can provide valuable peace of mind, helping you navigate complex financial and regulatory requirements while ensuring transparency, accuracy, and accountability.
Both audits have the following key differences:
| Statutory Audit | Non-Statutory Audit |
|---|---|
| Required by law | Not required by law |
| Mandatory | Voluntary |
| Scope is fixed by law | Scope is decided by the client |
| Conducted by an independent external auditor | Conducted by an internal or external auditor |
| Primarily carried out to ensure financial statements are legally compliant | Conducted to improve operations or meet management requirements |
| Report may be submitted to legal authorities or shareholders where required | Report is submitted only to the client |
The most obvious distinction is legal compulsion. Statutory audits are created by law and administered through regulation, whereas non-statutory audits are undertaken voluntarily, with their scope and terms defined by the commissioning party.
From this fundamental difference, several others follow. A statutory audit must be carried out by a qualified and registered auditor . A non-statutory review can, in theory, be conducted by an internal team, although independence significantly enhances its credibility.
Statutory audit reports may be publicly filed, while non-statutory reports are generally intended for internal use or a specific group of stakeholders. In addition, statutory audits must be completed within prescribed timeframes and formats, whereas non-statutory audits have greater flexibility regarding timing and presentation.
The term “statutory” refers to something that derives its authority from a statute, meaning a law enacted by a governing body. A statutory right, for example, exists because legislation provides it, rather than because two parties agreed to it through a contract.
A statutory audit is an audit that a company is legally required to undertake under applicable laws and regulations. In the UK, this obligation is governed by the Companies Act 2006. Similar requirements exist across Europe. In France, for example, commercial legislation requires businesses exceeding certain thresholds to appoint statutory auditors.
The legal authority behind these requirements leaves little room for discretion. Businesses must comply or risk penalties for non-compliance.
The specific requirements depend on the size and structure of the business. In the UK, companies that exceed two of three defined thresholds, including annual turnover above £10.2 million, a balance sheet total above £5.1 million, or more than 50 employees, generally lose their entitlement to claim a small company exemption under the audit threshold requirements and exemptions .
Public interest entities, banks, insurance companies, and listed businesses are subject to even stricter obligations. These regulations are not merely advisory; they create legally binding responsibilities.
Responsibility for ensuring a statutory audit is completed rests primarily with the company’s management, particularly its directors. Directors owe fiduciary duties to shareholders, and arranging a proper audit forms part of those responsibilities.
Auditors must be appropriately registered and authorised. Their findings are reported in accordance with applicable financial reporting standards .
Any attempt to avoid the audit process, manipulate figures after the fact, or withhold material information from auditors can expose the business to significant legal and regulatory risk.
Statutory auditors operate independently. They review financial statements and assess whether they provide a true and fair view of the company’s financial position and performance. Following completion of the audit, their report is filed with Companies House and becomes part of the public record.
This transparency is one of the key reasons statutory audit frameworks exist. Investors, creditors, suppliers, regulators, and the wider public all benefit from access to reliable financial information.
A non-statutory audit is sometimes called a voluntary or internal audit. In this type of audit, a company or individual chooses to carry out an audit even though there is no legal requirement to do so.
There are many reasons why an organisation might take this approach. A business seeking investment may commission an independent external audit of its financial statements to demonstrate financial rigour before entering negotiations.
Similarly, a charity or not-for-profit organisation may arrange an audit to reassure donors. A company preparing for a merger may also want a detailed review of specific areas before due diligence begins in earnest. In each of these examples, the motivation is strategic rather than legal.
Because there is no statute dictating the scope, a non-statutory audit can be tailored to the specific area or function under review. It may focus on operational efficiency rather than financial statements, examining how effectively resources are being used across different departments.
In some cases, management uses these reviews to evaluate internal controls, procurement practices, or IT systems, often engaging specialist London auditors providing statutory and non-statutory services .
This flexibility can be extremely valuable, but it also means the quality of the audit depends heavily on the scope defined at the outset and the independence of the professionals carrying it out.
If your company is of the size and type that falls within the scope of a statutory audit, there is no grey area. The rules must be obeyed, and attempting to treat a statutory obligation as optional is not a risk worth taking. If your business is smaller or structured in a way that exempts it under the small business audit exemptions, a voluntary audit might still be worth considering, not because you are required to, but because the discipline of an independent review often surfaces issues that internal teams are too close to catch.
If you are working with experienced chartered accountants offering trusted statutory audit services in the UK and broader business compliance support (who understand both the statutory framework and the practical value of voluntary reviews), this gives you the clearest picture of where your business stands as well as any sector‑specific financial services audit needs. In a world where financial transparency is increasingly expected by lenders, regulators, and the people your business serves, that clarity is a competitive one.
In the UK, statutory means something that is enacted by or is required by a written law. Anyone found acting against that law is considered guilty.
Yes, statutory is mandatory as it is an act of UK Parliament. This makes it strictly mandatory.
Yes, employer-paid health insurance is a taxable benefit. You may need to pay additional income tax via PAYE.
A statutory authority is an official organisation, government agency or public committee. To create it, a specific legislation or statute is passed by parliament.
A statutory right is a legal protection or benefit which is granted to an individual by a formally written statute.