Lodging your Business Activity Statement (BAS) might feel routine, but small bookkeeping mistakes can add up. Even minor BAS errors in GST reporting, PAYG withholding, or expense classification can trigger amendments, interest, or additional work.
Over time, these issues can waste both time and money. Based on what we see every quarter, here are the most common BAS errors in bookkeeping and practical tips to prevent them.
1. Claiming the wrong GST on purchases
A common mistake is claiming GST on items that aren’t fully GST-inclusive, such as insurance premiums that include stamp duty, imported goods, or partially exempt items.
Tip: Review invoices carefully. For items like insurance, check whether the GST component is included — or if stamp duty or other non-GST components apply — before claiming. When in doubt, check ATO guidance on partially taxable or exempt items.
2. Mixing personal and business expenses
Including personal items as business GST claims, such as home utilities or personal purchases, can create problems.
Tip: Keep business and personal accounts separate, and ensure each expense has a clear business purpose. Attaching receipts in your accounting software makes BAS preparation easier.
3. Using personal accounts for business transactions
Using personal accounts for business transactions makes bookkeeping confusing and increases the risk of errors.
Tip: Maintain a dedicated business bank account for all business income and expenses. This keeps records clear, makes GST tracking easier, and avoids BAS errors.
4. Incorrect PAYG withholding reporting
Forgetting to include employee or contractor PAYG amounts in your BAS can happen easily.
Tip: Keep payroll records accurate and up to date. Cross-check your payroll totals against your BAS before lodging each quarter.
5. Misreporting fuel tax credits
Claiming fuel tax credits for ineligible uses — such as fuel for private purposes or vehicles not covered by the scheme — is a common error.
Tip: Maintain a clear log of fuel purchases and how the fuel is used. Keep invoices for all fuel purchases to substantiate claims.
6. Overlooking superannuation obligations
Even though super isn’t reported on the BAS, unpaid or late super is a frequent compliance issue.
Tip: Pay employee super each quarter, reconcile payroll totals, and ensure contributions are lodged by the due date. Accurate bookkeeping ensures super obligations are never missed.
7. Missing lodgement deadlines
Forgetting to lodge the BAS on time can create unnecessary complications.
Tip: Use calendar reminders, automated alerts, or work with your accountant to track deadlines. Consistent preparation ensures on-time lodgement and reduces stress.
The bottom line: bookkeeping accuracy saves time and effort
Even small BAS errors can require corrections each quarter, which takes time and effort. By maintaining accurate bookkeeping, keeping all business transactions in one account, checking GST on tricky items, tracking PAYG and super, and keeping fuel tax claims correct, you can lodge your BAS confidently and efficiently.
Need help getting your BAS right?
We can help you:
- Review your accounts before BAS lodgement
- Check GST claims, PAYG withholding, fuel tax credits, and super obligations
- Ensure expenses are correctly classified
- Keep your BAS lodgement on time
Accurate bookkeeping means less stress, fewer corrections, and smoother BAS lodgements — let’s make sure your next BAS is spot on.
