Audit preparation for accountants: a UK compliance guide
A practical guide to preparing clients for audits and staying compliant year-round.
Written by Jotika Teli—Certified Public Accountant with 24 years of experience. Read Jotika's full bio
Published Thursday 11 June 2026
Table of contents
Key takeaways
- UK small company audit thresholds increased from 6 April 2025. Turnover rises to £15 million and total assets to £7.5 million. The employee threshold stays at 50. Many clients may now qualify for audit exemption.
- Structured audit preparation, from initial documentation through to post-audit follow-up, reduces compliance risk. It also positions your practice as a trusted advisory partner.
- Centralised record-keeping and automated internal controls help you respond to auditor requests quickly with accurate financial data.
- Ongoing compliance monitoring, including Making Tax Digital readiness, keeps clients audit-ready year-round and reduces last-minute pressure.
What types of audits affect your clients
Your clients face several types of regulatory scrutiny, each with different triggers and documentation requirements. Understanding which audits apply is the first step in building a preparation plan.
Statutory audits on annual accounts
Companies that exceed the small company thresholds must have their annual accounts audited by a registered auditor. From 6 April 2025, the thresholds increased for the first time in nearly a decade.
A company now qualifies as small if it meets at least two of three criteria. A company qualifies if annual turnover is up to £15 million and total assets up to £7.5 million. The employee threshold remains at 50.
A company must meet the criteria for two consecutive financial years to qualify for exemption. Review each client's position carefully, particularly those close to the new thresholds. For full details, see the gov.uk guidance on small and dormant companies.
HMRC compliance checks
HMRC conducts compliance checks on tax returns, payroll records, and VAT submissions. These can be triggered randomly or by specific risk indicators in a client's filings.
Making Tax Digital (MTD) for VAT is now mandatory for all VAT-registered businesses. Digital record-keeping is no longer optional. MTD for Income Tax Self Assessment launches in April 2026 for those with qualifying income over £50,000. From April 2027, the threshold drops to £30,000.
Anti-money laundering audits
Accountancy practices supervised under the Money Laundering Regulations face periodic anti-money laundering (AML) audits. These focus on client due diligence and risk assessment procedures. Keeping AML documentation current and accessible saves significant time when a review is triggered.
How to prepare clients for an audit
Thorough preparation reduces stress during an audit and strengthens your client's compliance position. These steps cover the essentials.
1. Organise financial records and documentation
Complete, accurate financial records are the foundation of any audit. Ensure all client records are reconciled and up to date well before an audit begins.
Records spread across multiple systems and physical files slow you down. Cloud-based accounting software like Xero centralises financial data and connects client bank accounts for a live transaction feed. You can generate reports in a few clicks, freeing up time for advisory work.
2. Review regulatory requirements for each client
Regulations change, and so do your clients' circumstances. A business exempt from statutory audit last year may now exceed the thresholds. The reverse is equally possible under the updated 2025 criteria.
Reporting tools help you assess where each client stands. A profit and loss report for the last quarter can highlight discrepancies before an auditor finds them. Xero's financial reports make it straightforward to produce these on demand.
3. Implement internal controls
Internal controls act as a first line of defence against compliance failures. They fall into two categories: preventative and detective.
Preventative controls reduce risk before it occurs. For example, an automated approvals process ensures all payments are authorised before they are made. Detective controls identify issues after they happen, such as external audits surfacing non-compliance.
Encouraging clients to conduct their own internal reviews helps them address compliance gaps iteratively. Xero's analytics tools support continuous monitoring. You and your clients can spot anomalies early rather than waiting for an external review.
Supporting clients during an audit
Once an audit is underway, your role shifts to responding to auditor requests and maintaining clear communication. Keeping your client confident throughout the process is equally important.
How should you communicate with auditors?
Open, timely communication keeps an audit moving. Agree on channels and formats upfront. Ask the auditor how they prefer to receive reports and documentation.
Software that generates reports from live data saves time here. With Xero, you can create financial reports from reconciled data and export them in the format your auditor needs.
How do you provide accurate audit evidence?
Incorrect or incomplete evidence slows an audit down and increases scrutiny. Auditors may request reports for specific date ranges or the most recent financial data.
You need tools that generate customisable reports from up-to-date figures. Xero lets you adjust date ranges and consolidate several reports into a report pack. Key financials like profit and loss and cash flow statements are readily available.
Managing workload pressure during audits
Balancing audit support with your regular client work is demanding. If you are compiling evidence manually, the time pressure builds quickly.
Centralising data storage is the most effective way to ease that pressure. When you know where everything is saved, you can retrieve information quickly. Xero brings your financial records and documents into one secure location.
Post-audit follow-up and ongoing compliance
The work does not end when the audit is over. Addressing findings promptly prevents the same issues from recurring.
Reviewing and acting on audit findings
Review the audit report with your client and talk through each finding. Resolving issues quickly keeps them on track and reduces future compliance risk.
Go back to the financial records to identify root causes. With Xero, you can generate a balance sheet and use the "Compare with" feature. This lets you view data against past periods. This makes it easier to spot trends and pinpoint when issues began.
Prioritising and implementing recommendations
Audit reports often contain multiple recommendations. Prioritise them by risk level and urgency. You could use a traffic-light system to rank each item. Then work with your client to assign improvements to team members with clear deadlines.
Some improvements can be addressed with technology. If a client needs tighter controls on invoicing, apps that integrate with accounting software can automate approval workflows. This makes it harder for errors to slip through the net.
Building year-round audit readiness
Ongoing compliance monitoring is more effective than annual preparation. Generate and review reports with clients regularly. Ensure both you and your client have access to live data so anomalies are spotted early.
Automating compliance processes helps maintain accurate records without adding to your workload. Xero Practice Manager helps you manage workflows and deadlines across your client portfolio. Xero HQ gives you a single view of all your client organisations. Combining these tools with regular reviews keeps clients audit-ready throughout the year.
Simplify audit preparation with Xero
Effective audit preparation depends on having the right tools and a clear process in place. The Xero Partner Program gives your practice access to Xero HQ and Xero Practice Manager. It also includes Xero Tax, subscription discounts, and a listing in the Xero advisor directory.
FAQs on audit preparation for accountants
Here are some frequently asked questions about audit preparation for accountants and bookkeepers in the UK.
What are the UK small company audit thresholds from April 2025?
From 6 April 2025, a company qualifies as small if it meets at least two of three criteria. A company qualifies if annual turnover is up to £15 million and total assets up to £7.5 million. The employee threshold remains at 50. Small companies are generally exempt from statutory audit. A company must meet the criteria for two consecutive years to qualify.
How does Making Tax Digital affect audit preparation?
MTD for VAT is already mandatory for all VAT-registered businesses, requiring digital record-keeping. MTD for Income Tax Self Assessment launches in April 2026 for qualifying income over £50,000. From April 2027, this extends to income over £30,000. Accurate digital records support smoother audit preparation.
What documents should you prepare for a UK audit?
Auditors typically need financial statements, bank reconciliations, invoices, receipts, and payroll records. For HMRC compliance checks, you may also need VAT returns and supporting calculations. Having these centralised in cloud-based software means you can produce them quickly.
How can accountants help clients stay audit-ready year-round?
Regular financial reviews and automated internal controls are the foundation. Centralised record-keeping supports both. Generate and review reports with clients quarterly at minimum. Use Xero Practice Manager to track deadlines and Xero HQ to monitor client portfolios. This helps you spot compliance gaps before they become audit findings.
What is the difference between preventative and detective controls?
Preventative controls reduce risk before it occurs; for example, automated approval workflows for invoices. Detective controls identify issues after they happen, such as external audits or exception reporting. Effective audit preparation combines both types to minimise compliance risk.
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Disclaimer
Xero does not provide accounting, tax, business or legal advice. This guide has been provided for information purposes only. You should consult your own professional advisors for advice directly relating to your business or before taking action in relation to any of the content provided.