Small business audit preparation: records, checks and obligations

Small business audit preparation starts with understanding that most Australian small businesses do not need an annual financial audit unless a lender, investor or regulator requires one. An audit examines financial statements, transactions and records for accuracy and compliance. A regular internal review can help identify gaps before they grow.

Keeping records organised throughout the year makes that work less daunting, especially when you’re balancing customers, staff and the day-to-day running of a business in Rockhampton. The Australian Taxation Office says businesses must keep tax records for at least 5 years, so a clear, accessible filing system matters well beyond year-end.

This guide explains what an audit involves, when one may be required and how an audit differs from a review. It also covers records and obligations to consider, including how requirements can vary for companies, charities, self-managed super funds and Australian Financial Services Licence holders. Knowing what applies helps you prepare calmly and focus on the right records.

How often should a small business conduct a financial audit?

Most Australian small businesses aren’t required to have a financial audit every year. An annual audit may still be required by a lender, investor or regulatory authority, while an internal audit each year can help owners identify errors and weak processes. The right frequency depends on the business’s legal obligations and financing arrangements.

For reckless reporting, the Australian Taxation Office can apply a penalty of up to 75% of a tax shortfall. Missing records can leave claims unsupported during an audit, so keep evidence for each transaction and tax position.

Company size can change the obligation. Under the Corporations Act 2001, large proprietary companies generally require an annual audit if they meet at least two of these three thresholds: revenue greater than A$50 million, assets greater than A$25 million, or more than 100 employees. A small business below those thresholds may still need an audit if its lender, investor or regulator requires one. Confirm the relevant requirement before planning your year-end work.

Even without a statutory audit, a regular internal review offers a practical check of financial reporting and compliance. You can review your own records or arrange an independent examination when funding applications, ownership changes or unusual transactions call for extra scrutiny. Keep the purpose clear: a tax audit checks tax records, while a financial audit examines financial statements and accounting records.

Start by gathering records that show how each figure was calculated and reported. A useful audit file can include:

• Financial statements, trial balance, general ledger and chart of accounts.
• Bank statements, loan agreements, invoices, receipts and expense claims.
• Tax returns, BAS records, GST calculations and supporting documents for deductions.
• Payroll reports, employee details, superannuation records and leave balances.
• Corporate records, such as company resolutions, ownership information and related-party transactions.

Australian businesses should retain tax records for at least 5 years, according to the Australian Taxation Office. Store digital files in clearly labelled folders, keep original documents where required, and make sure records can be matched to the relevant reporting period.

Reconciliations connect your records to the figures in your financial statements. Match each bank account to its statement, compare payroll totals with payment records, and check that GST reported in BAS records agrees with the ledger. For example, investigate an unreconciled supplier payment before it becomes an unexplained year-end balance. Keep the reconciliation and supporting documents together, with a note explaining any adjustment.

For steady small business audit preparation, make record checks part of your regular bookkeeping routine instead of waiting for an audit request. Dated reconciliations, documented approvals and clear explanations of unusual transactions help show how figures were produced and support accurate reporting.

Audit frequency and the difference between audits and reviews

For Australian businesses, audit timing depends on the obligation. Most statutory audits take place annually, in line with the financial year. The Australian Taxation Office can also initiate a tax audit at any time, so keep reporting and internal controls current between year-ends.

An audit and a review examine financial information to different depths. An audit involves a more in-depth examination and provides a high level of assurance. A review is less extensive and provides limited assurance. Australian financial statement audits assess whether reports comply with Australian Accounting Standards. The right engagement depends on what the report must demonstrate to lenders, investors, regulators or other stakeholders.

Charity requirements offer a practical example of how the distinction works. Medium-sized Australian charities registered with the ACNC and reporting annual revenue between $250,000 and $499,999 are required to have a review rather than an audit. The required assurance level is linked to the organisation’s category, not simply its preference for a lighter process.

Reviewing assets before year-end can reveal reporting issues early. Compare the asset register with the general ledger, then check that purchases, disposals and depreciation entries have supporting records. If equipment has been sold, for example, confirm that the disposal appears in both the register and accounting records. Check depreciation calculations against the business’s accounting policy and investigate unexpected changes before figures flow into financial statements.

A pre-audit review is a focused check before an external auditor begins work. Start with the latest trial balance and financial statements. Trace selected balances to invoices, bank records or other evidence, then list unexplained differences. Review unusual journal entries, related-party transactions and significant accounting judgements. Record who is responsible for resolving each issue and retain the explanation with its supporting documents.

Internal reviews help owners test whether controls work in everyday operations. For example, check that approval of a supplier payment is recorded separately from entry of the payment. Review bank reconciliations, expense approvals and access to accounting systems. If a control has been bypassed, document what happened and how the process will be corrected. These checks help management identify weaknesses without treating every internal review as an independent audit.

Use a simple reporting calendar to schedule reconciliations, asset-register checks and internal-control reviews throughout the year. To connect reporting needs with accounting and advisory support, consider what assurance stakeholders require and which balances carry the greatest risk.

Checking payroll and superannuation records

Payroll checks compare amounts paid with employment records, accounting entries and superannuation evidence. Reviewing these records together can reveal errors before they affect reporting or an audit.

Common Record-Keeping Mistakes

Common mistakes include missing payslips, inconsistent employee details and superannuation payments that do not match payroll reports. These matter because an auditor needs clear evidence to trace payroll amounts from calculation to payment. For example, keep an approved pay adjustment with the payroll report showing the change.

Another gap is recording wages as a single total without keeping employee-level details. Keep each pay run’s reports, payment records and approval evidence together. If a correction is needed, retain the original entry and document the adjustment, reason and date. That history helps explain the final balance objectively.

Inspecting and Comparing Records

Inspecting and comparing records means tracing payroll and business figures between source documents, accounts and reports. The Australian Taxation Office requires businesses to keep records that explain their tax affairs, including supporting evidence for reported amounts. Australian businesses must retain tax records for at least 5 years, according to the Australian Taxation Office. This gives an audit reviewer a clear trail to follow.

For each pay period, compare the payroll summary with bank payments and the general ledger. Check employee names, gross pay, deductions and recorded superannuation contributions against contracts and payroll reports. Investigate differences, then keep the explanation and supporting documents with that period’s records.

Payroll records should show how each employee’s pay was calculated and authorised. Compare employment contracts with pay rates, hours, leave entries and recorded allowances. When a contract changes, keep the approved variation with the pay run where it first applies. This helps explain why an employee’s wages differ from an earlier period.

Check superannuation contributions against payroll calculations and payment records. Confirm contributions are up to date and properly recorded, then investigate any mismatch between the payroll report and the accounts. A payment confirmation, contribution record and ledger entry together provide a stronger audit trail than a spreadsheet total alone.

Gather documents for each pay run in a consistent folder or accounting system. Include:

• Payroll summaries, employee pay records and payment confirmations.
• Employment contracts, approved changes and timesheets.
• Superannuation calculations, contribution records and related ledger entries.
• Leave records, termination calculations and approvals for unusual payments.

Use a consistent naming pattern, such as the pay-period end date and report type, so records are easy to find. If your payroll system exports reports, retain the original files and reconcile their totals to the accounts. A regular filing routine helps keep evidence complete and makes discrepancies easier to resolve.

Organising audit supporting documents

A well-organised audit file links transactions to financial statements, tax returns and asset records. Grouping documents by account and reporting period helps you explain how each balance was calculated.

Build the file around the general ledger, then add evidence supporting each account balance. For example, match a supplier expense to its invoice, payment record and approval. Add a brief note when a transaction needs explanation, such as a refund processed after the original sale.

Supporting documents vary by transaction. Sales may need customer invoices, receipts and credit notes; purchases may need supplier invoices and proof of payment. For an asset purchase, retain the invoice and delivery evidence, then link them to the asset register and depreciation calculation. Support a loan balance with lender statements and repayment records.

File documents in a consistent structure, such as financial year, account, then transaction date. Use descriptive names that show the date, supplier and document type. “May supplier invoice” is harder to trace than a file name identifying the transaction and date. Keep a separate index mapping each statement or schedule to its ledger account.

• Sales records: invoices, receipts, refunds and customer statements.
• Expense records: invoices, receipts, approvals and payment evidence.
• Asset records: purchase documents, disposal records and depreciation schedules.
• Tax records: lodged returns, BAS working papers and calculations supporting reported amounts.
• Reconciliation records: bank statements, account reconciliations and explanations for adjustments.

Supporting schedules should show how figures were derived and reconcile to the general ledger and financial statements. For example, a schedule of outstanding customer balances should agree with the receivables control account. If totals differ, identify the reconciling items and retain evidence for each adjustment instead of relying on an unexplained spreadsheet figure.

Prepare the year-end audit file before fieldwork begins. Check each folder for missing pages, duplicate documents and unreadable scans. A reviewer should be able to move from a financial statement line to the relevant ledger account, schedule and source document without searching through unrelated folders.

Owners can make the process easier by agreeing on simple filing rules with the people who create or approve transactions. Show staff how to attach invoices to accounting entries and record why an adjustment was made. Tailor the file to the business: a retailer may need inventory-count records, while a consulting business may focus on customer invoices and project expenses.

A short document index can also guide the audit process. List each account, related schedule, folder location and person responsible for answering questions. Before sharing files, check that each document belongs to the right reporting period and supports the recorded transaction. This practical review helps you provide clear evidence and explain unusual balances calmly.

Australian audit obligations by business type

Audit obligations in Australia depend on an entity’s structure, activities and reporting requirements. A small business may not need a statutory audit, but charities, self-managed super funds and some companies have specific requirements. Identify your business type first, then determine which reports must be audited and lodged.

Large proprietary companies generally need an annual audit if they meet at least two of three thresholds: revenue greater than A$50 million, assets greater than A$25 million, or more than 100 employees. If your company approaches these thresholds, review its figures and structure before year-end. Reconciliations should support reported revenue, assets and liabilities, so errors can be investigated before an external audit.

Some registered Australian charities may be subject to audit requirements depending on their circumstances. Medium-sized charities registered with the ACNC and earning between A$250,000 and A$499,999 annual revenue require a review rather than an audit. The distinction affects the assurance process and the documents prepared for reporting. Check the charity’s registration and revenue against the relevant category.

Self-managed super funds must be audited annually by an approved SMSF auditor. Australian Financial Services Licence holders must lodge audited financial statements with the Australian Securities and Investments Commission. These obligations differ from an ATO tax audit, which can examine tax records and may be initiated at any time. The reason for an audit determines its scope and the records requested.

How far back can the ATO audit a small business in Australia? The ATO may initiate a tax audit at any time, and Australian businesses should retain tax records for at least 5 years. Keep records accessible by reporting period so you can respond to requests with relevant evidence.

How much does an audit cost for a small business in Australia? The price depends on the case and is provided after a quote request. Key factors include the audit’s purpose and scope, the business’s size and complexity, and the condition of its accounts and supporting records.

Whatever your business type, make audit work more manageable by assigning someone to each request, documenting actions and keeping reconciliations current. If an external auditor identifies an error, provide a clear explanation and supporting evidence, then record the corrective action. A simple register of requests, responsible staff and outstanding documents helps keep operations moving during fieldwork.

If you’re weighing up the records and reporting steps your business needs, discuss your audit obligations and plan the next action.

Business Wise: Business Accounting and Advisory

Business Wise is a family-owned firm that understands the care and effort involved in running a small business. Its Business Accounting and Advisory services offer a practical sounding board as you make decisions and manage your finances.

For the day-to-day work of keeping accounts and BAS information organised, Business Wise provides Bookkeeping & BAS Services. Tax Preparation and Tax Advisory also support business owners with tax reporting and planning, guided by their business needs.

If you’d value a friendly conversation about your next steps, contact Business Wise.

Make audit readiness part of your routine

Make audit preparation useful beyond compliance. Use the process to build a clearer picture of how money moves through your business, where decisions are documented and which records need attention. A steady routine can make financial information more useful for planning, not just responding to an auditor.

For small business audit preparation, choose a practical next step: review a reconciliation, tidy a supporting-document folder or clarify how an unusual transaction was recorded. Then make that habit part of your regular business routine. Consistent improvements can help you stay on top of your numbers as your business changes.

Business Wise can support your next steps through Business Accounting and Advisory, Bookkeeping & BAS Services, and Tax Advisory. If you’d like help getting your records and reporting in order, contact Business Wise for audit support.

With a clearer view of your records, you can make decisions with greater confidence and keep moving your business forward.

Frequently Asked Questions

What is an audit?

An audit is a structured examination of financial information and the records behind it. For example, an auditor may trace a recorded sale from the ledger to its invoice, payment evidence and bank entry. This helps assess whether the financial statements fairly represent the business and whether relevant requirements have been followed. The audit’s scope depends on its purpose, such as statutory reporting or a tax matter.

What should I do if I discover an accounting error during the audit?

Tell the auditor promptly, correct the accounting error and provide an explanation with supporting documents. For example, if a supplier invoice was entered twice, show the original invoice, duplicate entry and correcting journal entry. Record who approved the correction and why. Do not remove or overwrite the original entry without preserving an audit trail that explains the change.

What records should an Australian small business prepare for an audit?

Prepare records supporting the balances being examined, then organise them by account and reporting period. Alongside financial statements and ledger reports, include evidence for unusual transactions, such as a customer refund, owner withdrawal or asset disposal. If the auditor selects a balance, trace it from the report to its source document and explain any adjustment. Keep a clear index of file locations.

What documents do Australian businesses need for an ATO audit?

Gather documents supporting the tax figures under review, such as lodged tax returns, BAS records, sales and purchase invoices, bank statements, expense evidence and relevant payroll reports. The ATO’s request identifies the tax period and issues being examined, so match your documents to those details. For a deduction, bring together the receipt, payment record and business explanation showing its connection to business activity.

How should a small business reconcile bank statements, invoices and tax returns before an audit?

Start with each bank statement and match its transactions to entries in the accounting records. Investigate missing payments, duplicate entries and deposits without clear descriptions. Then compare invoice totals and GST coding with the relevant ledger accounts and BAS figures. Trace tax-return amounts back to those records and document reconciling differences. A brief note explaining a timing difference, such as an uncleared payment, makes the audit trail easier to follow.

How do you prepare payroll and superannuation records for an Australian business audit?

Choose a pay period and compare employee pay records with the related contract, approved hours and payment evidence. Check that superannuation calculations agree with payroll reports and that contributions are recorded against the right employees and periods. If a pay rate changed, retain the approved variation and note when it took effect. Keep correction records with the relevant pay run so the auditor can follow the original amount and adjustment.

What is the difference between an ATO review, audit and independent financial audit?

An ATO review or audit concerns a business’s tax affairs, while an independent financial audit examines financial statements and accounting records. A financial statement review is less in-depth and provides limited assurance; an audit involves more examination and provides a higher level of assurance. The label alone does not define the work: check the purpose, scope and information requested in the engagement or ATO correspondence.

How can an Australian small business respond to an ATO audit notice?

Read the notice carefully and identify the tax periods, issues and documents requested. Assign one person to coordinate the response, gather records addressing each request and keep copies of everything provided. If figures need explaining, prepare a concise note linked to the supporting evidence. Record the response date and communicate promptly if a document is unavailable, rather than sending unrelated files or leaving the request unanswered.

Article by

Lloyd Priddle

Lloyd has been in the industry for over 30 years and has worked in a number of domestic and international firms.