You run a business. You sell a product. You provide a service. You send an invoice and charge GST. Simple, right? Not always.
Before you add 10% GST to an invoice, there is one important question to ask: “Is this a taxable supply?” If you are registered for GST, this matters. Not every sale you make automatically has GST. Some sales are taxable. Some are GST-free. Some are input taxed.
Understanding the difference can save you from charging GST when you shouldn’t, or forgetting to charge it when you should. Let’s break it down.
What is a taxable supply?
A taxable supply is a supply that is subject to GST. Under the Australian GST rules, a supply is generally taxable when certain conditions are met. The main requirements are that:
- You make the supply for consideration.
- The supply is made in the course or furtherance of your business.
- The supply is connected with Australia.
- You are registered, or required to be registered, for GST.
- The supply is not GST-free or input taxed.
When these conditions are met, you generally need to charge 10% GST on the sale. That sounds technical. But let’s look at what it means in real life.
Let’s say you run a business
Imagine you own a small electrical business. A customer asks you to install new lights. You complete the work and charge: $2,000 + GST. The installation is part of your normal business activity. You are GST registered. The supply is connected with Australia. And there is no special GST-free or input-taxed treatment. So the supply is generally taxable.
You charge: $2,000 × 10% = $200 GST, Your customer pays: $2,200. The $200 GST is collected from your customer and accounted for through your GST reporting.
What does “consideration” mean?
This word appears frequently in GST rules. Don’t let it scare you. In simple terms, consideration is what you receive, or are entitled to receive, for making the supply. Most of the time, this is money. You provide a service. Your customer pays you. That’s consideration.
But consideration does not always have to be cash. There can also be other forms of consideration, such as a trade or exchange.
The supply must be connected with Australia
A taxable supply also needs to be connected with Australia under the GST rules. This can depend on what you are supplying and where the supply is made or performed. For example, the GST treatment of an Australian business selling services to an overseas customer can be different from a sale to an Australian customer.
So if you deal with overseas customers, don’t automatically assume that GST applies. The rules for exports and international transactions can be more complicated.
You need to be registered for GST
Another important condition is GST registration. If you are registered for GST, you generally charge GST on your taxable supplies. If you are required to be registered, you need to make sure you register at the correct time. If you are not registered and are not required to be registered, you generally don’t charge GST simply because you are selling something. This is why GST registration and taxable supplies are closely connected.
Taxable does not mean every sale has GST
This is one of the biggest misunderstandings. You might think: “I sell something through my business, so I add 10% GST.” Not necessarily. GST law separates supplies into different categories. A supply can be: Taxable, GST-free or Input taxed. And the treatment can be completely different.
Taxable supply vs GST-free supply
Let’s say you make a taxable sale for $1,000. You generally charge: $1,000 + $100 GST = $1,100. Now imagine you make a GST-free supply for $1,000. You generally charge: $1,000. There is no GST added to the customer price. But there is an important point.
GST-free does not mean the sale is ignored for all GST purposes. For example, GST-free supplies can still be relevant when calculating your GST turnover. So don’t confuse “GST-free” with “not part of the business turnover”.
What about input-taxed supplies?
Input-taxed supplies are another category. With an input-taxed supply, you generally don’t charge GST to your customer. But you may also be unable to claim GST credits for related purchases. Certain financial supplies and residential rental activities are common examples of input-taxed supplies, subject to the relevant rules. This is very different from a taxable supply. That’s why getting the classification right matters.
A simple example
Let’s imagine you run a business selling products. You sell a product for: $500 before GST. The sale is taxable. So you charge: $500 + $50 GST = $550. Your invoice might show: Product: $500, GST: $50, Total: $550. That $50 is GST collected from your customer. You then report the relevant GST through your BAS.
What if you get it wrong?
This is where a small mistake can become expensive. Imagine you make a sale that should have GST charged. But you issue the invoice without GST. You may later discover that you should have accounted for GST on the transaction. Now you may have to go back through your invoices and records.
The same problem can happen in reverse. You charge GST on a sale that should have been GST-free. Your customer may have paid too much. You may then need to correct the transaction. Nobody wants to spend a Friday afternoon fixing hundreds of invoices. That’s why it is worth getting the GST treatment right from the beginning.
How do I know if my sale is taxable?
Before charging GST, ask yourself a few simple questions:
1. Am I registered for GST?
2. Am I making this sale as part of my business?
3. Is the supply connected with Australia?
4. Am I receiving something in return, such as payment?
5. Is the supply GST-free?
6. Is the supply input taxed?
If the relevant requirements are met and the supply is neither GST-free nor input taxed, it is generally taxable.
Don’t just rely on your invoice software
Your accounting software can calculate GST. It can even automatically add 10%. But it cannot always know the correct GST treatment of a transaction. For example, you might have:
- A normal sale.
- An overseas sale.
- A GST-free sale.
- A sale of a business asset.
- A financial transaction.
- A transaction involving both business and private use.
These may not all have the same GST treatment. So make sure your software is set up correctly. And if a transaction looks unusual, check it before you invoice.
The bottom line
A taxable supply is not simply “anything my business sells”. It is a supply that meets the GST requirements and is not GST-free or input taxed. For most ordinary taxable sales made by a GST-registered business, you charge 10% GST.
But before you add that 10%, take a moment. Ask what you are actually selling. Check the GST treatment. And if you are unsure, get advice. Because GST is not just about knowing the 10% rate. It is about knowing when that 10% actually applies.
