What to Expect During an External Audit: A Plain-English Guide for Business Owners

If your business is due for an external audit, it is normal to feel a bit uncertain about what lies ahead. You may be wondering how much work it will involve, whether it will disrupt the business, and what the auditors will actually be looking for.

The good news is that an external audit is usually far more structured and manageable than many business owners expect. It is not there to catch you out. Its main purpose is to give shareholders, lenders, regulators and other stakeholders confidence that your financial statements can be relied on. SCC Chartered Accountants positions its audit service as value-adding as well as compliant, with a focus on risk and system testing, commercial recommendations and linked support across wider advisory areas.

Why your business may need an external audit

Not every company needs a statutory audit, but many still do. In the UK, for financial years beginning on or after 6 April 2025, a private company will usually qualify for audit exemption only if it meets at least 2 of these 3 conditions: annual turnover of no more than £15 million, assets of no more than £7.5 million, and an average of 50 or fewer employees. Northern Ireland follows the same UK company law framework for these thresholds.

In Ireland, a small company may qualify for audit exemption if, in the financial year concerned and the preceding year, it meets 2 of these 3 tests: balance sheet total not exceeding €7.5 million, turnover not exceeding €15 million, and employees not exceeding 50. There are also exclusions, so the exemption is not available to every type of company.

Even if your business qualifies for exemption, you may still choose to have an audit, or be required to have one because of group reporting, shareholder agreements, funding arrangements or lender requirements. In Ireland, shareholders holding at least 10% of voting rights can also require an audit in certain circumstances.

If your company operates across the UK, Ireland and Northern Ireland, it helps to work with advisers who understand both systems. That is where cross-border accounting & tax support can make the process more straightforward.

What the audit is actually reviewing

An external audit is not the same as bookkeeping, year-end accounts preparation or tax filing. The auditor is not producing the numbers for you. Instead, they are reviewing the financial statements your business has prepared and assessing whether those statements give a true and fair view.

That means testing the figures, but also looking at the systems and controls behind them. Auditors want to understand how transactions are recorded, who approves key decisions, how reconciliations are reviewed, and whether there are any obvious weaknesses that could lead to material error or fraud.

This is one reason businesses often benefit from having strong support in areas such as digital bookkeeping, tax compliance and internal audit. SCC’s own service pages show that its external audit work links closely with those wider advisory and assurance areas.

What happens before the audit starts

The process usually begins with planning. Before any detailed testing takes place, your audit team will want to understand the business itself. They may ask about your structure, your accounting systems, your year-end timetable, any major changes during the year, and any areas where you already know there could be complexity.

You will normally receive a list of documents and schedules to prepare. This often includes:

• Draft financial statements
• Trial balance
• Bank reconciliations
• Sales ledger and purchase ledger reports
• Fixed asset register
• Payroll summaries
• VAT records
• Stock reports
• Loan agreements
• Board minutes
• Key contracts

The more organised your records are, the smoother the audit tends to be. If your bookkeeping is current, your reconciliations are tidy, and your supporting documents are easy to retrieve, the audit is less likely to drag on or generate avoidable queries.

What the auditors are likely to ask about

During fieldwork, the auditors will usually focus on areas where errors are more likely or where judgement is involved. That often includes:

• Revenue recognition
• Cut-off at year end
• Stock and work in progress
• Trade debtors
• Bad debt provisions
• Accruals and prepayments
• Director balances
• Related party transactions
• Loans and finance arrangements
• Going concern
• Estimates and assumptions

If a balance looks unusual, expect questions. If margins changed sharply during the year, expect questions. If your business entered a new market, restructured operations, changed finance systems, or took on new funding, expect questions.

That does not mean anything is wrong. It means the auditors are doing their job properly.

In some cases, those questions overlap with wider advisory work. For example, if there has been a refinancing, acquisition or disposal, there may be links to corporate finance. If there are signs of financial pressure or significant uncertainty, recovery & restructuring support may also become relevant. If there is a dispute or suspected irregularity, forensics & investigations may be part of the wider picture. SCC lists all of these as connected service areas within its wider offering.

How to make the process easier on your side

The businesses that cope best with audit season usually do not treat it as a last-minute exercise. They prepare early, assign responsibility clearly, and answer queries promptly.

A few practical steps can make a big difference:

• Assign One main contact internally
• Keep Key reconciliations up to date
• Flag Major issues early
• Store Important documents in one place
• Answer Queries promptly and clearly
• Raise Questions when something is unclear
• Review Unusual transactions before fieldwork starts

It also helps to be open. If there is an unresolved issue, a delayed reconciliation or an area where judgement has been applied, it is usually better to say so at the start rather than wait for the auditors to uncover it later.

For growing owner-managed businesses, SME business solutions can support the wider finance function so the business is in a stronger position before audit work begins.

What happens at the end of the audit

Once testing is complete, the audit team will clear final queries, agree any adjustments, and complete its review procedures. If sufficient appropriate evidence has been obtained, the auditor will then issue the audit report with the financial statements.

You may also receive a management letter. This often highlights control weaknesses, process gaps or efficiency issues that came to light during the audit. That feedback can be useful because it gives you a chance to strengthen systems before the next reporting cycle.

A good audit should not only help you meet a legal requirement. It should also help you improve the quality of your reporting, tighten internal controls and give stakeholders more confidence in the way your business is run.

A final word

An external audit does not need to feel daunting. In plain English, it is a structured review of your financial statements and the systems behind them. If your records are in order, your team is prepared, and you approach the process openly, it can be much more straightforward than you might think.

If you want help preparing for an upcoming audit, understanding whether your business needs one, or getting your systems in better shape ahead of year end, SCC Chartered Accountants offers support across external audit, internal audit, tax compliance, digital bookkeeping, specialist tax, cross-border accounting & tax, resources, news & insights, our team and contact us. If you would like clear advice in plain English, now is a good time to start the conversation.