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Audit & Assurance Services in the UK: Understanding the Differences and BenefitsWritten on February 21, 2025 by Sarah Godwin

Audit and assurance services are essential for businesses that want to maintain financial integrity, meet regulatory requirements, and build stakeholder trust. But what do these terms mean, and how do they differ? Below, we break down both concepts in simple terms.

What is an Audit? A Simple Guide for UK Businesses

An audit is a structured examination of a company’s financial records, processes, and controls. Conducted by independent professionals, audits provide an objective assessment of whether financial statements accurately reflect an organisation’s financial position.

Key aspects of an audit include:

• Compliance: Ensures financial records align with accounting standards and legal regulations.
• Accuracy: Verifies that financial statements are free from material misstatement.
• Transparency: Provides shareholders and stakeholders with confidence in the company’s financial health.

Audits can be statutory (legally required) or voluntary, depending on the size and nature of the business. They help organisations detect fraud, improve internal controls, and enhance credibility.

What Is Assurance in Accounting? How It Benefits UK SMEs

Assurance services go beyond audits, offering a broader evaluation of financial and non-financial information. These services aim to improve the quality, consistency, and reliability of data that businesses use for decision-making.

Key elements of assurance services include:

• Risk assessment: Identifies potential financial and operational risks.
• Process improvement: Enhances efficiency in financial reporting and business operations.
• Credibility: Provides assurance to investors, regulators, and other stakeholders.

Unlike audits, assurance services can cover a variety of reports and processes, such as sustainability reports, internal controls, and corporate governance.

Audit vs. Assurance: Key Differences for UK Businesses

While both audit and assurance services help businesses maintain transparency and accountability, they serve different purposes:

• Scope: Audits focus on financial statements, while assurance services extend to broader business processes.
• Regulatory requirement: Audits are often mandatory for larger businesses, while assurance services are typically optional.
• Objective: Audits aim to confirm financial accuracy, while assurance services work to enhance trust in various aspects of a business.

Businesses that use both audit and assurance services benefit from a more comprehensive understanding of their financial health and operational efficiency.

Which companies need an audit?

All UK companies, including subsidiaries of overseas groups, must comply with UK audit obligations. The director of a company is responsible for making sure audits are carried out. Failing to meet audit deadlines can incur late filing fees, prosecution of the company and directors, plus problems with credit referencing.

UK limited companies are subject to an external audit if they meet at least two of the below:

• Turnover of more than £10.2m
• Balance sheet total of more than £5.1m
• Number of employees more than 50

One point to note is that the audit thresholds are changing from 6^th April 2025.

New Size Thresholds (Effective 6 April 2025):                           

The following companies must also have an audit:

• Public company (unless it’s dormant)
• Funder of a master trust pensions scheme
• Subsidiary company (unless it qualifies for an exemption)
• Authorised insurance company
• Carrying out insurance market activity
• Involved in banking
• Pensions or labour relations body
• Issuer of electronic money
• Markets in Financial Instruments Directive (MiFID) investment firm
• Undertakings for Collective Investment in Transferable Securities (UCITS) management company
• Corporate body and its shares have been traded on a regulated market
• Special register body

You must get your accounts audited if shareholders who own at least 10% of the shares ask you to. Even if your company is usually exempt from an audit.  Both the company and the group must be considered for a UK parent or subsidiary company to be exempt from audit.

Why Choose Kirk Rice for Audit & Assurance Services?

The information above represents only a basic outline of companies requiring an audit and is not an exhaustive checklist. Audit rules and regulations are complex. Taking expert advice early on to understand your obligations can save a lot of stress further down the line.

By working closely with audit clients, we aim to achieve better outcomes. Kirk Rice’s audit and assurance services provide you with insights to operate your business confidently, delivered in a language you understand. Whether through risk mitigation, improved financial controls, or strategic insights, we strive to enhance business performance and financial stability. To get in touch with Kirk Rice about audit and assurance services, email us at info@kirkrice.co.uk 

Please note: This article is correct as at the publication date. The answers are given for general guidance only and specific advice should be taken before acting on any of the suggestions made. The information is based on current tax legislation which may change in future. Information is based on our current understanding of taxation legislation and regulations. Any levels and bases of relief from taxation are subject to change. The Financial Conduct Authority does not regulate tax planning.