An ATO review can arrive when you are already managing work, payroll, supplier invoices and day-to-day life. This ATO audit preparation guide explains how to respond calmly, protect your position and give the ATO clear, accurate information without creating unnecessary stress.
An audit does not automatically mean you have done something wrong. The ATO may check a return, BAS, GST claim, payroll reporting or deduction because information does not match its records, an item is unusual for your industry, or a matter has been selected for review. What matters most is how well your records support what has been reported.
Start by understanding exactly what the ATO is asking for
Read the ATO letter or secure message carefully before sending any documents. It should identify the period under review, the tax type involved, the information required and the due date. An enquiry about one work-related deduction is very different from an audit covering several years of BAS, PAYG withholding and income tax.
Do not assume the ATO needs every record your business holds. Providing a large volume of unrelated documents can make the process harder to manage and may raise further questions. Instead, create a simple file for the review and match each requested item to the relevant transaction, return or claim.
If the request is unclear, seek clarification early. You can ask what documents will satisfy the request, whether electronic copies are acceptable, and whether more time is available if records need to be retrieved. A deadline should never be ignored, even if you cannot provide everything immediately.
ATO audit preparation guide: gather records in a logical order
The strongest response is complete, accurate and easy to follow. Start with the lodged tax return, BAS or activity statements for the period being reviewed. Then collect the source documents that explain the figures reported.
For an individual employee, this may include income statements, bank statements, receipts for deductible expenses, a work diary, logbook records and evidence of any reimbursed costs. A deduction needs a clear connection to earning income and must not have been privately reimbursed or claimed twice.
For a sole trader or business, the relevant records often extend further. They may include invoices issued, supplier bills, bank feeds and reconciliations, accounting reports, contracts, stock records, payroll summaries, superannuation payment evidence and vehicle records. Keep documents in date order and use clear file names so a transaction can be traced from the source record to the reported amount.
Where records have been kept digitally, make sure they are readable and complete. A spreadsheet total alone is not usually enough. The ATO may need to see the invoice, receipt, bank payment or other evidence behind it. Generally, tax records should be retained for at least five years, although records connected with assets may need to be kept longer.
Reconcile before you respond
Reconciliation is where many issues become visible. Compare sales in your accounting software with bank deposits, GST reported on BAS, and income shown in the tax return. Compare wages with STP reporting, PAYG withholding payments and superannuation records. Check that expense claims are supported by invoices and that personal purchases have not been treated as business costs.
For a trades business, this may mean checking subcontractor payments against invoices, contracts and any required reporting. For a transport operator, fuel purchases and fuel tax credit calculations should align with vehicle use records. Retailers and manufacturers may need to explain inventory movements, supplier rebates or variations between sales reports and bankings. Medical and allied health practices should ensure practitioner income, service fees and patient payments are correctly separated.
A difference is not necessarily a problem. Timing, cash versus accrual accounting, refunds, loan proceeds and internal transfers can all explain why figures do not immediately align. The key is to identify the reason, retain evidence and explain it clearly.
Give accurate answers, not rushed answers
It is tempting to reply quickly to make the matter disappear. However, a hurried answer that conflicts with your records can create more work later. Take the time to check the facts, especially when a question relates to several financial years or involves private and business use.
Your written response should address each ATO question directly. State what the transaction or claim relates to, provide the supporting documents and explain any calculation in plain English. If a vehicle expense has been apportioned for work use, show how the percentage was determined. If GST has been claimed, explain why the purchase was made for the enterprise and provide the tax invoice where required.
Avoid changing, recreating or backdating records after receiving an ATO notice. If a document is missing, say so honestly and look for independent evidence such as bank statements, supplier copies, emails, contracts or calendar entries. A reasonable reconstruction may be possible in some circumstances, but it should be clearly identified as such rather than presented as an original record.
Check the common pressure points before the ATO does
Some areas deserve extra attention because they are frequently misunderstood or because small errors can add up over time. For businesses, review these areas before responding:
- GST coding, including private purchases, GST-free sales and mixed-use expenses.
- Cash sales, deposits and transfers between business and personal accounts.
- Contractor payments, payroll, STP reporting and PAYG withholding.
- Superannuation guarantee calculations and evidence of payments made by the due date.
- Motor vehicle, travel, meals and home office claims with a private component.
- Loans, owner drawings, director payments and money introduced into the business.
For employees, work-related expenses should be tested against the same practical questions: Did you pay for it yourself, was it directly related to earning your income, and do you have evidence? A purchase being useful for work does not always make the full cost deductible. Ordinary clothing, private travel and expenses that have been reimbursed are common examples where claims may need adjustment.
If you find an error, deal with it early
Finding an error before or during a review is uncomfortable, but ignoring it is rarely the right option. The appropriate response depends on the type of error, the period involved and whether the ATO has already contacted you about that specific issue. An amendment, corrected activity statement or voluntary disclosure may be needed.
Early, honest action can help demonstrate that you are taking compliance seriously. It does not remove every consequence, and interest or penalties may still apply depending on the circumstances. However, a well-documented correction is generally far easier to manage than an unexplained discrepancy found later.
Do not make a correction simply because a figure looks unfamiliar. First confirm whether it is an actual error or a timing difference. For example, a BAS may include an invoice on an accrual basis before the customer has paid it, while the bank account will not show the money until later.
Bring in support when the scope is larger than expected
A straightforward request for several receipts may be manageable on your own. A review involving multiple years, business structures, GST, payroll or significant deductions usually benefits from professional support. This is particularly true where the ATO has raised technical questions, proposed adjustments or requested a formal interview.
A registered tax agent can review the notice, organise the records, prepare responses and communicate with the ATO on your behalf with your authority. They can also identify issues that may affect other returns or BAS periods, rather than treating the review as a one-off paperwork exercise.
For Gippsland businesses, Tax and Accounting Solutions Gippsland can help turn scattered records into a clear response and keep the focus on practical compliance. Good preparation also improves everyday administration: reconciled accounts, organised invoices, accurate payroll and timely superannuation records make future reporting far less demanding.
The best time to prepare for an ATO audit is before a letter arrives. Set aside a regular time to reconcile accounts, file source documents and question unusual transactions while the details are fresh. That habit gives you something more valuable than a tidy file – confidence that your tax affairs can stand up to scrutiny.