Changing Your Auditor: When and How to Make the Switch

Why might you consider changing your auditor?

There are several common reasons why a company may decide to change auditors. These include:

• The business has grown or changed direction, and you now need a firm with deeper sector expertise or services that better match your size and complexity.
• You are not satisfied with the quality of service, communication or responsiveness from your current auditor.
• You are preparing for investment, refinancing or a sale, and you want a more proactive or strategic audit partner.
• You simply want a fresh perspective and a more collaborative relationship with your audit team.

Whatever the reason, it is important to approach the change in a structured and compliant way, especially for limited companies governed by the Companies Act 2006.

Although there is no legal requirement for private limited companies in the UK to change auditors after a specific number of years, professional ethical standards encourage firms to treat long-term audit relationships with care. In practice, many firms use the same soft guidelines applied to public-interest entities, reviewing the audit relationship—whether through rotating key personnel, benchmarking the firm, or running a tender process—around the 10-year mark. This helps preserve independence and objectivity while still allowing companies to benefit from continuity and sector-specific knowledge.

When is the right time to change auditors?

In practice, the cleanest time to change auditors is at the end of the financial year, when your current auditor's term is due to expire. At this point:

• The existing auditor will not automatically be reappointed if the company takes active steps to appoint someone else.
• The new auditor can begin work on the next set of accounts with a clear “handover” and minimal disruption.

However, it is possible to change auditors at other times if circumstances require it – for example where there is a breakdown in the relationship, a conflict of interest, or a pressing need for a different skill-set. Mid-year changes are more complex and must be handled carefully to avoid gaps in audit cover or regulatory issues.

If you are thinking about a change, it is worth planning at least six to twelve months before the year-end so that you can evaluate options, negotiate fees, and manage the legal and administrative steps smoothly.

How to find and instruct a new audit firm

Before triggering any formal process to remove your current auditor, it is sensible to:

1. Clarify what you want from your auditor.
   Are you looking for a more hands-on, advisory-style relationship, specialist sector knowledge, or a different level of support outside the audit cycle?
2. Research potential firms.
   Look for firms that regularly audit companies of your size and industry, and that demonstrate a clear understanding of your growth plans and regulatory environment.
3. Meet and obtain proposals.
   Arrange meetings or introductory calls with shortlisted firms and ask them to provide a written fee proposal and outline of how they will approach your audit.
4. Agree terms in writing.
   Once you have selected your new firm, confirm the engagement letter, scope, fees, timetable and key contacts so there is no ambiguity once the change is made.

Having a new firm lined up before you formally remove your current auditor helps avoid any risk of disruption to your audit timetable or filing deadlines.

The legal process for changing auditors

For UK limited companies, the Companies Act 2006 sets out the rules for appointing and removing auditors. The exact route depends on whether your current auditor is being removed or resigning, and whether the change is at year-end or mid-year.

Option 1: Change at year-end (common for private companies)

For most private companies, auditors are automatically reappointed each year unless the company takes action to replace them by passing an ordinary resolution to appoint a new auditor. You can also take the opportunity to decline automatic re-appointment and instead appoint a new auditor by written resolution of the members.
Key steps include:

• Ensuring the appointment is made within the statutory period (typically within 28 days after the end of the time allowed for sending out the previous year's accounts).?
• Formally notifying Companies House and, where relevant, any regulatory body of the appointment.

Option 2: Mid-term removal or resignation

If you wish to change auditors before the end of their term, there are two main routes:

• Removal by the company (section 510):
  The company can pass an ordinary resolution at a general meeting to remove the current auditor, provided 28 days' special notice is given and the auditor is allowed to make written representations and attend the meeting. This cannot normally be done by written resolution for private companies, so a general meeting is required.
• Auditor resignation (section 516):
  The auditor may resign by written notice to the company; this takes effect when the notice is received. In some cases the auditor may also need to deliver a statement to the company and, in certain circumstances, to the appropriate audit authority.

Once the current auditor ceases to hold office, the directors can usually appoint a replacement to fill the “casual vacancy” under section 485 of the Companies Act, and the new auditor then holds office until the next annual general meeting or the next re-appointment cycle.

Practical tips for a smooth transition

To make the switch as seamless as possible, we recommend:

1. Plan the handover early.
   Arrange a handover meeting (or series of meetings) between your current auditor, the new firm and your finance team. This is important for understanding key accounting policies, significant estimates, and any open issues.
2. Share key documentation.
   Ensure that the new auditor receives working papers, trial balances, prior year financial statements and notes, and any reports or correspondence from the previous firm.?
3. Communicate clearly with stakeholders.
   Keep the board, shareholders, bankers, and any other key stakeholders informed that you are changing auditors and why. A clear explanation usually reassures them that the change is motivated by commercial or strategic reasons, not by any underlying financial issue.
4. Review your audit approach.
   Use the change as an opportunity to discuss timescales, expectations, and how often you want to meet with the new auditor. You might also ask how they can support areas such as internal controls, tax planning, or growth strategy.

Make the change work for your business

Changing your auditor is more than just a compliance exercise; it is an opportunity to strengthen the way your business is supported and challenged throughout the year. When done at the right time and in the right way, a change of auditor can lead to better insights, stronger controls, and a more constructive relationship with your audit team.

If you would like assistance with evaluating whether it is the right time to change your auditor, or with managing the legal and practical steps involved, Simpson Wreford LLP can guide you through the process from beginning to end. Contact us today for a consultation and discover how we can support your business as it grows and meets new challenges.