The Australian Taxation Office knows far more about you than most small business owners realise. It matches your data against banks, other government agencies, share registries, crypto exchanges, property records, insurers and online platforms, and a mismatch can trigger an ATO audit or review very quickly. Add close to a billion dollars of fresh compliance funding and the odds of the ATO taking a closer look at your business are higher than they have been in years.
The good news: avoiding an ATO audit is not complicated. Three things keep a small business off the ATO's radar, and none of them involve being clever.
The ATO Has Almost $1 Billion to Come Looking
The 2025–26 Federal Budget handed the ATO an extra $999 million over four years, from 1 July 2025, to extend and expand its tax compliance activities — chasing unpaid tax debts and auditing and reviewing taxpayers. Treasury expects that to bring in around $3.2 billion over five years. Here is where the money went:
| Compliance program | Funding | Who it targets |
|---|---|---|
| Tax Avoidance Taskforce | $717.8m | Multinationals and large taxpayers |
| Shadow Economy Compliance Program | $155.5m | Cash economy, undeclared income, worker exploitation, illicit tobacco |
| Personal Income Tax Compliance Program | $75.7m | Individuals — work-related deductions, rental income, undeclared income |
| Tax Integrity Program | $50m | Medium and large business and wealthy groups paying tax and super on time (from 1 July 2026) |
The largest slice targets multinationals and big business. But the roughly $280 million across the shadow economy, personal income tax and tax integrity programs is pointed squarely at individuals and small business — and that is the funding most likely to land on your doorstep. The 2026–27 Federal Budget then added $86.3 million for real-time fraud detection and expanded the ATO's garnishee powers to reach jointly held assets. More money, better technology, stronger recovery powers.
How ATO Data Matching Works (And Why the ATO Already Knows)
ATO data matching is the engine behind most modern audits. The ATO runs close to 30 separate data-matching programs, collecting third-party information and comparing it to what you report in your tax return and BAS. Current programs capture:
- bank and financial transaction data via AUSTRAC, share transactions and crypto asset transactions
- real property transactions, rental bonds, property management data, landlord insurance and investment property loans
- motor vehicle registries, novated leases and lifestyle assets — boats, aircraft, high-value vehicles and fine art
- online selling platforms, sharing economy accommodation and ride-sourcing income
- government payments, Services Australia data, and Home Affairs visa and passenger movement records
Layer on Single Touch Payroll, the Taxable Payments Annual Report (TPAR) covering contractor payments in construction, cleaning, courier, IT, road freight and security, and tax return pre-fill, and the ATO has a near-complete picture before you lodge anything.
The practical point: the system flags the gaps automatically. No one has to decide you look suspicious.
Every Taxpayer Has an ATO Risk Profile
The ATO holds a risk profile for every single taxpayer in Australia — every individual, company, trust and partnership. It is scored on behaviour: how consistently you lodge, how consistently you pay, whether you respond to ATO contact, and how your figures compare to the ATO's small business benchmarks for your industry.
A low risk rating means the ATO's finite compliance resources get spent somewhere else. A high risk rating means you are watched far more closely, and it becomes very easy for the ATO to join the dots and conclude you may not be paying the right amount of tax. You cannot see your risk profile. You can absolutely influence it.
The Three Rules That Keep You Off the ATO's Radar
1. Lodge on time — every BAS, every return, every time
On-time lodgement is the strongest signal you send the ATO. Every business activity statement, income tax return, instalment activity statement, TPAR and FBT return, lodged by the due date. Late lodgement fires a failure to lodge on time (FTL) penalty and quietly pushes your risk rating up. A business that lodges four BAS a year on time for three years looks nothing like one that is habitually six weeks late.
If you cannot pay, lodge anyway. Lodgement and payment are separate obligations, and non-lodgement is by far the more damaging of the two.
2. Pay on time — or agree a payment plan before the due date
Pay your tax and BAS liabilities by the due date. Where cash flow will not allow it, put an ATO payment plan in place before the due date passes, not after the debt has aged and a firmer action letter has arrived. Unpaid ATO debt is now materially more expensive: the general interest charge (GIC) compounds daily and sits at 11.43% per annum for the July–September 2026 quarter, and GIC and shortfall interest charge incurred on or after 1 July 2025 is no longer tax deductible. For many businesses, an overdraft is now cheaper than using the ATO as a financier.
Watch out: The ATO is far more willing to escalate. Director penalty notices, garnishee notices, disclosure of business tax debts to credit reporting bureaus and wind-up action are all live options. With small business collectable debt reported at $35.9 billion, the ATO is under direct pressure to bring that number down — and ignoring ATO contact is the fastest way to become part of their solution.
3. Be registered for every tax you are required to be registered for
Registration gaps are easy for the ATO to detect, because the data tells on you. Check that you are correctly registered for:
- GST — once GST turnover reaches $75,000 ($150,000 for not-for-profits, and from the first dollar for taxi, ride-sourcing and limousine travel)
- PAYG withholding — from the day you pay your first employee, and where no ABN is quoted
- Fringe benefits tax (FBT) — if you provide cars, entertainment, car parking, loans or living-away-from-home benefits to employees or directors
- PAYG instalments — where the ATO has issued instalment obligations for income tax
- Other registrations — fuel tax credits, wine equalisation tax and luxury car tax where relevant to your industry
Exceed the GST turnover threshold without registering and the ATO can backdate your registration and assess the GST you should have collected — out of your own pocket, plus penalties and interest. Review your registrations annually, not once when the ABN was issued.
Not Sure Where Your Business Stands With the ATO?
Late lodgements, an ageing tax debt or a missing registration are all fixable — and far cheaper to fix before the ATO writes to you than after. We review lodgement history, registrations and ATO position for Perth business owners and give you a plain-English picture of where you sit. Book a free 15-minute call to get started.
Book a Free Call →What a High-Risk ATO Profile Looks Like
- BAS lodged late, in batches, or not at all
- an ATO account balance that never gets back to zero, or payment plans defaulted on
- ATO letters, calls and MyGov messages left unanswered
- super guarantee paid late or missed entirely
- margins well outside the ATO's small business benchmarks for your industry
- declared income that does not sit comfortably with the assets and lifestyle the ATO can already see
Perth Small Business Tax Checklist 2026
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The Goal Is to Be Irrelevant and Invisible
None of this is meant to frighten anyone — it is simply how the system now works. Lodge on time. Pay on time, or agree a plan before the due date. Be registered for everything you should be. Do those three things consistently and your risk rating stays low, the ATO's compliance budget gets spent somewhere else, and you spend your time running your business instead of defending it.
With the ATO, you want to be irrelevant and invisible.
Frequently Asked Questions
What triggers an ATO audit for a small business?
Common ATO audit triggers include a mismatch between reported income and third-party data-matching information, repeated late BAS lodgement, an ageing tax debt, results outside ATO industry benchmarks, unusually high deductions relative to turnover, unpaid super guarantee, and failing to respond to ATO contact.
How far back can the ATO audit me?
The standard amendment period is two years for most individuals and small business entities and four years for other taxpayers, from the date the notice of assessment issues. Where the ATO forms the view there has been fraud or evasion, there is no time limit.
Is an ATO payment plan a black mark against my business?
No. A payment plan arranged before the due date and then honoured is viewed far more favourably than a debt left to age. What damages your profile is defaulting on the plan or ignoring the ATO altogether.
Is interest on an ATO debt still tax deductible?
No. General interest charge and shortfall interest charge incurred on or after 1 July 2025 is not deductible, which materially increases the after-tax cost of carrying an ATO debt.
My closing view
Need a second set of eyes on your lodgements, registrations and ATO position? We work with small business owners to get compliance back on track and keep it there. Get in touch for a no-obligation review of where your business stands with the ATO.