What Happens if I Make a Mistake on My BAS?
- johnry8
- Sep 23
- 2 min read
Your Business Activity Statement (BAS) is how you report your GST, PAYG and other taxes to the ATO. Reporting incorrectly can lead to penalties or delays in processing refunds. But more than that, it can create unnecessary stress and confusion.
Many business owners worry they will be punished for small errors, or they assume it is too late to fix them. But the truth is, the ATO understands that people make mistakes, especially when managing everything from sales to staff to tax.
Fixing issues early helps you stay compliant, protect your cash flow, and avoid future audits. It is all about knowing what to do next.
Common BAS Mistakes
Some of the most common errors we see include:
Claiming GST on purchases that are not actually GST-inclusive
Leaving out income or doubling up on invoices
Reporting PAYG incorrectly
Putting figures in the wrong labels
Forgetting to include fuel tax credits or adjustments
If you find a mistake, do not panic. You have a few options depending on the size and type of the error.
What You Can Do to Fix It
1. Small Mistakes? Adjust It in Your Next BAS
If the mistake is minor, you can usually correct it in your next BAS. This applies to most GST errors under the ATO’s adjustment limits. It is simple and does not require you to amend anything officially.
2. Major Errors? Lodge a Revision
For larger mistakes or errors outside the adjustment rules, you can revise your lodged BAS. You can do this through your accounting software or via the ATO’s Online Services. It is important to act quickly to avoid penalties.
3. Communicate with the ATO
The ATO appreciates transparency. If you think the mistake might raise concerns, or if you are unsure what to do, it is always best to reach out. We at Rise Accountants can help you frame the issue and respond correctly.
How to Avoid BAS Mistakes in the First Place
Reconcile your bank transactions regularly
Keep your receipts and invoices organised
Set calendar reminders for lodgement dates
Use accounting software that integrates with the ATO
Work with a BAS agent or accountant you trust
Our team often sees mistakes come from trying to rush or from misunderstanding GST eligibility rules. That is why having someone check your work before you lodge can save you from headaches down the road.
Made a mistake on your BAS and not sure what to do next?