How to Fix BAS Mistakes Without ATO Penalties

Making mistakes in your Business Activity Statement (BAS) is more common than you think. Thousands of Australian businesses submit incorrect BAS reports every quarter—leading to cash flow issues, compliance risks, and potential penalties from the Australian Taxation Office (ATO).

The good news? If handled correctly and promptly, most BAS errors can be fixed without penalties.

In this guide, we explain common BAS mistakes, how to correct them, and how to stay compliant—so your business can grow without stress.

What is a BAS?

A Business Activity Statement (BAS) is a report submitted to the ATO that includes:

Goods and Services Tax (GST)
Pay As You Go (PAYG) instalments
PAYG withholding
Other tax obligations

Accurate BAS reporting is critical to maintaining compliance and avoiding unnecessary costs.

Common BAS Mistakes Businesses Make

Even with modern accounting software, errors still occur. Here are the most common BAS mistakes:

1. Incorrect GST Reporting

Misclassifying GST-free and taxable sales
Claiming GST credits on non-eligible expenses (e.g., personal items, bank fees)
Entering wrong GST codes

2. Unreconciled Financial Records

Not matching bank statements with accounting records
Duplicate or missing transactions
Mixing personal and business expenses

3. PAYG Withholding Errors

Not reporting employee wages correctly
Recording payroll in the wrong categories

4. Missing Transactions

Forgetting to include refunds or adjustments
Omitting income or expenses

5. Payroll & Super Errors

Miscalculating employee tax or super contributions
Incorrect reporting in BAS

Will the ATO Penalise BAS Mistakes?

The ATO understands that genuine mistakes happen.

👉 If you:

Identify the error early
Voluntarily disclose it
Correct it promptly

You can often avoid penalties completely.

However, repeated errors or intentional non-compliance may lead to fines and audits.

Step-by-Step: How to Fix BAS Mistakes

Follow this simple process to correct your BAS:

Step 1: Identify the Error

Review your:

Invoices and receipts
Payroll records
GST calculations

Step 2: Understand the Type of Error

Determine whether the mistake relates to:

GST
PAYG withholding
PAYG instalments

Step 3: Adjustment vs Revision

Minor errors → Adjust in your next BAS
Major errors → Lodge a revised BAS

Step 4: Access ATO Online Services

Step 5: Lodge the Correction

Submit:

Revised BAS form, or
Updated figures in your next BAS

Ensure all corrections are clearly documented.

When Should You Make a BAS Adjustment?

Adjustments are required when changes occur after lodgement, such as:

Price changes after issuing an invoice
Customer returns or refunds
Cancelled transactions
Reversal of GST credits

These are usually reported in your next BAS.

How to Avoid BAS Mistakes in Future

Preventing errors is easier than fixing them. Follow these tips:

✅ Use reliable accounting software
✅ Reconcile bank statements regularly
✅ Keep personal and business finances separate
✅ Stay updated with ATO regulations
✅ Work with professional bookkeepers

Why Choose Titantax?

At Titantax, we help Australian businesses:

Lodge accurate BAS statements
Fix errors without penalties
Stay compliant with ATO requirements
Manage GST, PAYG, and bookkeeping efficiently

Our experts ensure your financial records are always accurate, up-to-date, and audit-ready.

Final Thoughts

BAS mistakes can happen—but ignoring them can cost your business time and money.

The key is to:

Act quickly
Correct errors properly
Seek expert guidance when needed

With the right support, you can stay compliant and focus on growing your business.

📞 Contact Titantax

📞 Phone: 0457 696 620
📧 Email: info@titantax.com.au

🌐 Website: https://titantax.com.au/

📍 Address: Unit 14, 164 Government Road, Richlands QLD 4070