What Are the Key Things the ATO Looks for in an Audit?

March 11, 2026
General Business Accounting
Many business owners feel uneasy when they hear the word audit. It sounds serious, and it can be, but in most cases, the Australian Taxation Office is simply checking that the information in your tax returns matches the records you keep in your business.
An audit is about accuracy and honesty. The ATO checks if income is reported correctly, expenses are legitimate, and records support your return. Clear, consistent bookkeeping makes the process manageable.
Businesses working with Expert Accountants Port Stephens and Nelson Bay are often more confident because their financial records are regularly organised and reviewed for accuracy and compliance, helping them make informed financial decisions.
In this guide, we will walk through the key areas the ATO focuses on during an audit and how small businesses can reduce the risk of problems.

Why the ATO Conducts Audits

The ATO does not audit businesses randomly as often as people think. Most audits begin because something in the data stands out. The ATO uses technology to compare tax returns across industries, income levels, and business structures.
If the numbers reported by a business appear unusual compared with those of similar businesses, the ATO may review the information more closely.
Common triggers include unusually high deductions, missing income, large cash transactions, or inconsistencies between GST and income reported.
This is why working with local accountants in Port Stephens can help. Experienced accountants understand what the ATO expects to see and can identify issues before they become problems.

Accurate Reporting of Income

The first thing the ATO looks for is whether all income has been reported correctly.
Income includes more than just payments received into a bank account. It can also include online payments, cash sales, deposits, and income from multiple sources.
For example, a small business may receive income from:
• EFTPOS transactions
• Online payment systems
• Direct bank deposits
• Cash sales
• Government grants or support payments
The ATO receives information from banks, payment platforms, and other sources. If the numbers reported on a tax return do not match that information, it raises questions.
For businesses using small business accounting in Port Stephens, proper monthly income reconciliation helps ensure everything is reported correctly.

Valid Business Expenses

The next area the ATO focuses on is deductions. Businesses can claim many expenses, but each expense must meet certain rules.
The expense must relate directly to earning business income. It must also be supported by records such as receipts, invoices, or bank statements.
Common deductible expenses include:
• rent for business premises
• equipment purchases
• business vehicle costs
• accounting fees
• advertising and marketing
• software subscriptions
Trouble often arises when personal expenses are claimed as business deductions, such as travel or household costs, which the ATO may adjust during an audit.
Good bookkeeping services in Nelson Bay help keep business and personal spending separate, which reduces risk during an ATO review.

Proper Record Keeping

The ATO expects businesses to keep clear financial records for at least five years.
Records should include:
• invoices issued to customers
• receipts for expenses
• bank statements
• payroll records
• superannuation payments
• BAS lodgement documents
Many businesses now use accounting software, which makes record-keeping easier. Digital records are acceptable as long as they are accurate and accessible.
When businesses seek BAS lodgement help, accountants review records, confirm accuracy, offer compliance advice, and help address any discrepancies before submission, reducing the risk of BAS errors.

GST and BAS Reporting

GST reporting is another area the ATO reviews carefully.
If a business is registered for GST, the figures reported in Business Activity Statements must align with the income reported in tax returns.
The ATO may compare:
• sales reported in BAS
• GST collected from customers
• GST claimed on expenses
• income reported in the annual tax return
If the numbers do not match, it can lead to further questions.
Working with knowledgeable accountants nearby helps ensure BAS and tax returns align properly.

Cash Transactions

Cash businesses receive extra scrutiny because cash transactions are harder for the ATO to verify.
Industries with frequent cash payments may be monitored more closely by the ATO.
The ATO reviews bank deposits, cash register records, industry benchmarks, and supplier payments to assess income reporting.
Reported income below industry expectations may trigger a deeper investigation.
Daily, accurate bookkeeping demonstrates reported income is complete.

Business and Personal Expenses

Another issue the ATO frequently checks is the separation of business and personal finances.
Many small businesses start with mixed personal and business transactions, which complicates accounting over time.
During an audit, the ATO may review whether personal expenses have been claimed as business deductions.
Examples might include:
• personal groceries
• private travel
• home expenses not related to business
• family purchases
Keeping a separate business bank account and credit card helps avoid confusion and makes accounting clearer.
Professional business advisory services in Nelson Bay often help business owners structure their finances correctly from the start.

Payroll and Superannuation

If your business has employees, payroll compliance becomes another focus area.
The ATO will look at whether:
• employees are classified correctly
• wages are reported accurately
• PAYG withholding is paid on time
• superannuation is paid correctly
Failure to meet superannuation obligations is one of the most common issues identified in audits.
Accurate payroll records and timely payments help reduce risk.

SMSF and Investment Reporting

For business owners who also manage a self-managed super fund, the ATO may review SMSF compliance as part of broader financial checks.
Areas commonly reviewed include:
• investment documentation
• related party transactions
• correct valuation of assets
• compliance with super rules
Proper SMSF accounting in Port Stephens ensures investment records and reporting meet regulatory requirements.

Consistency Between Different Reports

The ATO compares information across multiple reports. This includes:
• income tax returns
• BAS statements
• payroll reporting
• superannuation payments
• third-party data
If these records do not match, it may lead to further questions.
Consistency across all reporting is one of the best ways to reduce audit risk.

Industry Benchmarks

The ATO publishes benchmarks for many industries. These benchmarks show typical ranges for income, expenses, and profit levels.
If a business reports figures far outside these ranges, the ATO may review the return.
For example, if a business reports unusually low income relative to similar businesses, it may attract attention.
Experienced Expert Accountants in Port Stephens and Nelson Bay often review benchmark data to identify potential issues early, helping clients address challenges before they become costly problems.

How Businesses Can Reduce Audit Risk

The best way to reduce audit risk is to maintain clear and accurate records throughout the year.
Practical steps include:
• keep all receipts and invoices
• reconcile bank accounts regularly
• separate business and personal finances
• Review BAS before lodging
• work with experienced accountants
Many audits occur because of small mistakes that accumulate over time. Regular accounting reviews help prevent these issues.

The Value of Professional Accounting Support

Running a business already requires attention to customers, staff, and operations. Accounting compliance can easily fall behind when things get busy.
Working with small business accounting professionals in Port Stephens allows business owners to focus on their business while experienced accountants monitor financial records and fulfil reporting obligations. Accountants can identify compliance risks early, help resolve issues, and represent the business during audits to ensure the process runs smoothly and efficiently.

Frequently Asked Questions About ATO Audits

What usually triggers an ATO audit?

Audits often begin when the ATO notices unusual patterns in tax returns. This may include high deductions, missing income, inconsistent GST reporting, or figures that differ from industry benchmarks.

How far back can the ATO audit a business?

In most cases, the ATO can review records going back five years. This is why businesses must keep accurate financial records for at least that period.

What documents does the ATO ask for in an audit?

The ATO may request bank statements, receipts, invoices, payroll records, BAS statements, and accounting reports. They use these documents to confirm that income and expenses reported in tax returns are accurate.

Can a small business be audited by the ATO?

Yes. Businesses of all sizes can be audited. Small businesses are often reviewed because they may rely on manual records or cash transactions.

How can accountants help during an audit?

Experienced accountants help organise financial records, respond to ATO information requests, explain the numbers in tax returns, and provide support throughout every step of an audit, making the process much easier for businesses working with Expert Accountants Port Stephens and Nelson Bay.

Final Thoughts

An ATO audit does not have to be a crisis. In many cases, it is simply a review to confirm that financial records support the information reported in tax returns.
Businesses that keep clear records, report income accurately, and seek professional advice usually manage audits without major issues.
Working with experienced local accountants in Port Stephens can make a significant difference. Regular bookkeeping, accurate BAS reporting, and professional tax advice provide confidence that your business meets its obligations.
When your financial records are organised and transparent, an audit becomes far less stressful and far easier to manage.
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