Getting GST right is one of those jobs that seems straightforward until a small mistake turns into an unexpected tax bill or an ATO review. Many Australian small businesses make GST errors without realising it. In most cases, they’re not trying to do the wrong thing.
They simply misunderstand the rules or rely on incomplete bookkeeping.
The good news is that most GST mistakes are avoidable. By understanding the common pitfalls and keeping accurate records, you can save time, avoid penalties, and keep your Business Activity Statements (BAS) accurate.
GST Mistakes That Cost Small Businesses (And How to Avoid Them)
If your business is registered for GST, You’re responsible for collecting GST on taxable sales, claiming GST credits correctly, and reporting everything accurately through your BAS.
Even small errors can lead to incorrect GST refunds, extra tax payable, interest charges, or the need to amend a previous BAS lodgement. Here are some of the most common GST mistakes Australian small businesses make, and how to avoid them.
1. Claiming GST on Purchases That Don’t Include GST
One of the most common mistakes is assuming every business expense includes GST.
In reality, some expenses don’t have GST at all, so there’s no GST credit to claim. These commonly include:
Employee wages
Most bank fees and financial services
Some government fees and charges (excluding GST)
Certain insurance products
For example, if your business pays monthly bank account fees, those fees are generally input-taxed and don’t include GST. Claiming a GST credit on them will result in an incorrect BAS.
Before claiming GST, check the supplier’s tax invoice. If no GST has been charged, you generally can’t claim a GST credit.
2. Forgetting to Charge GST on Taxable Sales
Some businesses accidentally issue invoices without GST, particularly when they're new to business or have recently become GST registered.
This can happen because:
Accounting software isn't set up correctly.
GST settings are applied incorrectly to products or services.
Staff accidentally create GST-free invoices for taxable sales.
The problem is that you're still responsible for paying the GST to the ATO, even if you didn't charge your customer correctly. That means the GST may need to come out of your own pocket.
Review your invoices regularly and make sure your accounting software applies the correct GST treatment to every taxable sale.
3. Claiming GST on Personal Expenses
Another common mistake is mixing personal and business expenses.
GST credits are generally only available for purchases related to running your business. Personal spending doesn't qualify, even if it was paid using the business bank account.
Examples include:
Family groceries
Personal holidays
Private vehicle expenses
Household purchases with no business purpose
If an expense is partly for business and partly personal, you can generally only claim the business portion of the GST.
Keeping separate business and personal accounts makes this much easier.
4. Poor Record Keeping
Good bookkeeping is about more than staying organised; it also helps you avoid costly GST mistakes. Many businesses run into trouble because they lose receipts, don't keep tax invoices, enter transactions incorrectly, or leave their bookkeeping until it's time to lodge their BAS.
Without proper records, it can be difficult to prove you're entitled to claim GST credits.
To claim GST credits, you generally need a valid tax invoice for purchases of more than A $82.50 (GST inclusive). So, keeping digital copies of your invoices and updating your records regularly can save you time, reduce stress, and help prevent compliance issues.
5. Using the Wrong GST Classification
Not every sale is treated the same for GST purposes.
Depending on the type of goods or services you provide, a transaction may be:
Taxable
GST-free
Input taxed
Businesses operating in industries such as healthcare, education, food, or property often encounter more complex GST rules.
Using the wrong GST code in your accounting software can affect every BAS you lodge, especially if the same mistake is repeated over several months.
If you're unsure how a particular sale should be treated, it's worth checking before lodging your BAS.
6. Registering for GST at the Wrong Time
Some businesses delay GST registration because they assume they can wait until the end of the financial year.
However, if your GST turnover is $75,000 or more (or $150,000 for non-profit organisations), you generally need to register for GST.
Waiting too long can create problems: if you were required to register but delayed, you may still be liable to pay GST on taxable sales made from the date registration should have applied.
On the other hand, some businesses voluntarily register before reaching the threshold to claim GST credits on business purchases. While this can be beneficial, it also means meeting ongoing GST reporting obligations.
7. BAS Lodgement Mistakes
Preparing a BAS isn't simply a matter of copying figures from your accounting software. Common mistakes include lodging after the due date, entering incorrect sales figures, forgetting GST adjustments, estimating numbers instead of using actual records, or carrying forward errors from previous BAS lodgements.
These mistakes can have costly consequences. Late or incorrect BAS lodgements can result in interest charges, penalties, or requests for additional information from the ATO.
Taking the time to review your BAS before lodging can help you avoid unnecessary corrections and compliance issues.
Example
Imagine Lucy, a café owner in Melbourne, prepared their quarterly BAS using bookkeeping records they had updated themselves.
During the quarter, she purchased a new coffee machine, food supplies, paid staff wages, and incurred monthly bank fees. When completing the BAS, she accidentally claimed GST credits on both the employee wages and bank fees.
Before lodging the BAS, their accountant reviewed the figures and noticed the mistake. The incorrect GST claims were removed, the BAS was corrected, and the business avoided receiving a larger GST refund than it was entitled to.
While it was a simple error, correcting it before lodgement reduced the risk of future amendments or ATO compliance issues.
Simple Ways to Avoid GST Mistakes
Most GST errors stem from poor processes rather than complicated tax rules.
A few good habits can make a big difference:
Keep your bookkeeping up to date.
Store tax invoices digitally.
Review GST coding regularly.
Reconcile your accounts before preparing your BAS.
Separate business and personal spending.
Ask for professional advice when you're unsure.
Spending a little time checking your records throughout the year is much easier than fixing mistakes after you've lodged your BAS.
Final Thoughts
GST is part of everyday business in Australia, but that doesn't mean it's always straightforward. Small mistakes, such as claiming GST where none exists, charging the wrong GST on sales, or lodging an inaccurate BAS, can quickly become expensive if they're left uncorrected.
The good news is that these mistakes are usually preventable with accurate bookkeeping, regular reviews, and a clear understanding of the GST rules that apply to your business.
If you're unsure whether your GST reporting is correct, or you'd like help with BAS preparation, bookkeeping, or GST compliance, Clear Tax is here to help.
Our experienced team works with Australian small businesses to keep their records accurate, meet their tax obligations, and avoid costly GST mistakes, so you can spend more time focusing on running your business.
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