Why BAS Errors Are Costing Small Businesses More Than Ever
For many small business owners, lodging a Business Activity Statement (BAS) feels like a routine administrative task.
But what appears to be a minor coding error today can become a costly compliance issue tomorrow.
The Australian Taxation Office (ATO) has identified over-claiming expenses and GST credits as one of its current small-business focus areas. The ATO is also increasingly using data matching and technology to identify inconsistencies in business reporting. [ato.gov.au], [ato.gov.au]
The good news? Most BAS problems are preventable.
Let’s look at some of the most common mistakes and how to avoid them.
The ATO Is Looking Closely at GST Claims
The ATO’s current small-business focus areas specifically include:
- Over-claiming GST credits
- Incorrect deductions
- Omitted income
- Using business funds for personal purposes
- Poor record-keeping practices
These are not isolated audit targets. They are areas where the ATO sees recurring errors across thousands of businesses. [ato.gov.au]
In many cases, the issue isn’t fraud.
It’s simply a business making the same bookkeeping mistake over and over.
Mistake 1: Claiming GST Without a Valid Tax Invoice
One of the most common BAS errors is claiming GST credits where the business cannot produce a compliant tax invoice.
Examples include:
- Lost receipts
- Screenshots that don’t meet invoice requirements
- Supplier documentation that doesn’t show GST
- Bank transactions without supporting paperwork
Why it matters
If the ATO reviews a claim and supporting documentation isn’t available, the GST credit may be denied.
Spring Clean Tip
Review large purchases from the past 12 months and ensure supporting invoices are stored digitally and are easy to locate.
Mistake 2: Mixing Personal and Business Expenses
The ATO identifies the use of business money and assets for personal benefit as a focus area for small businesses. [ato.gov.au]
Examples include:
- Family holidays partially claimed as business travel
- Personal subscriptions paid through the business
- Private motor vehicle expenses
- Personal shopping charged to company accounts
Why it matters
The issue is often not the transaction itself.
The issue is failing to properly separate and document the business component from the personal component.
Practical Question
Can you clearly explain the business purpose behind every significant expense?
If not, it may be worth reviewing your coding and supporting documentation.
Mistake 3: Incorrect GST Coding
Many GST errors begin inside bookkeeping software.
Examples include:
- Coding GST-free purchases incorrectly
- Claiming GST on expenses that do not include GST
- Incorrect treatment of mixed supplies
- Claiming GST on private expenses
- Recording transactions in the wrong GST category
Why it matters
A single coding error may seem insignificant.
A repeated coding error across hundreds of transactions can create a substantial BAS adjustment.
Mistake 4: Not Reporting All Income
The ATO continues to focus on omitted income and increasingly matches information from multiple third-party sources. [ato.gov.au], [ato.gov.au]
Data can be received from:
- Banks
- Employers
- Government agencies
- Businesses
- Financial institutions
- Taxable Payments Annual Reports (TPAR)
The ATO states that it uses this information to identify errors and non-compliance. [ato.gov.au]
Common Examples
- Cash sales not recorded
- Online sales omitted
- Contractor income overlooked
- Deposits incorrectly treated as non-income
Important Point
What may feel like a small oversight can become highly visible when compared against external data sources.
Mistake 5: Poor Record Keeping
Many businesses don’t discover a record-keeping issue until they’re asked for documentation.
Common examples include:
- Missing receipts
- No motor vehicle logbook
- Missing supplier invoices
- Poor storage of digital records
- Unorganised document management systems
Why it matters
Good records make BAS reviews easier, improve bookkeeping accuracy, and significantly reduce stress if questions arise later.
Five BAS Health Check Questions
Before your next BAS lodgement, ask yourself:
✅ Do I have supporting documentation for significant GST claims?
✅ Are personal and business expenses clearly separated?
✅ Have I reviewed GST coding for accuracy?
✅ Am I confident all business income has been recorded?
✅ Can I quickly locate supporting records if requested?
If any answer is “not sure”, it’s worth addressing before lodging.
Conclusion
Most BAS errors aren’t caused by dishonesty.
They’re caused by stretched business owners, inconsistent bookkeeping processes, and systems that haven’t been reviewed for years.
The ATO’s focus on GST credits, omitted income, and personal use of business funds highlights the importance of maintaining accurate records and reviewing your bookkeeping regularly. [ato.gov.au], [ato.gov.au]
A BAS should be more than a compliance obligation.
It should be a regular opportunity to confirm that your business records are accurate, complete, and telling the right story.
Need a BAS Health Check?
If you’re unsure whether your GST coding, record-keeping, or business expense claims are correct, now is an ideal time for a review. A small adjustment today can prevent a much larger problem later.
