How to Calculate GST

GST (Goods and Services Tax) is a charge for consumption paid on the provision of products and services in many nations across the world. The particular regulations and costs might differ from one country to another.

On, we have a GST Calculator readily available to help you calculate GST easily. However, if you are interested in the traditional methods of calculating GST in Australia, feel free to continue reading our comprehensive article that covers everything related to GST calculation

How to calculate GST in Australia, the GST was first implemented on July 1, 2000 replacing the old federal wholesale sales tax system and meant to phase out a variety of State and Territory Government taxes, fees, and levies including banking taxes and stamp duty.

It caused quite a stir at the time. 

Businesses in countries where GST has been adopted are obligated to charge GST on the goods and services they offer to their consumers. The company collects this tax and then pays it to the government.

How to calculate GST

The GST they paid for their purchases, on the other hand, can also be claimed by businesses as input tax credits, thus offsetting the GST they owe on their sales. 

By using this technique, GST is guaranteed to be a value-added tax that is solely applied to the value contributed at each level of the supply chain.

What is GST payable?

The amount of GST that a company must pay to the government after subtracting input tax credits from the GST that was received on their sales is known as the GST payable. The company can even be qualified for a refund of the excess GST if the input tax credits exceed the GST collected.

How to calculate GST

Calculation of GST Payable:

The GST collected on sales during a certain period is subtracted from the Input Tax Credit (ITC) in order to determine the GST owed by a firm. 

The following equation determines the GST payable (How to Calculate GST):

GST Collected on Sales: This represents all of the GST collected on all goods and services the company sells.

Input Tax Credit (ITC):The GST that the company paid on purchases and other costs associated with its business activity is known as the input tax credit (ITC).

Australian GST: How to Calculate GST in Australia

In Australia, almost everyone who works for themselves as a sole proprietor or small business owner must pay attention and understand how to calculate GST.

How to calculate GST

Here a few points to keep in view about GST in Australia:

Ways of Calculating and Paying Australian GST :

GST is determined by multiplying the item’s cost by the applicable GST rate. For instance, a $100 product will in fact cost $110 instead of $100 or GST might already be included in the $100 price. 

This manual will walk you through the many methods of calculating GST for your company.

Adding the GST

Simply multiply the amount by 0.1 (or 10%) to include GST in a goods or service’s current pricing. Alternatively, you may just multiply the initial price by 1.1 (110%) to get the final cost.

For example: Let’s assume a manufacturer produces a widget with a cost of $90. 

When selling the widget, they need to include 10% GST imposed by the government. Here’s how the pricing would work out:

  • Cost of the product: $90
  • GST at 10%: $9 (10% of $90)
  • The final price will be: $99

Subtracting the GST:

In order to determine how much GST is included or the pre-GST pricing, you might have to deduct GST.

Divide the total price by 11 to determine the amount of GST that is included in the pricing.

Divide by 1.1 to get the total cost before GST was applied.

Here’s an example:

Sarah makes the decision to treat herself to the most recent iPhone, which retails for $1600. All items in the store are subject to 10% GST.

To figure out the GST, simply divide $1600 by 11.

                          $1600/11= $145

And to get the total cost before GST,

                         $1600/1.1= $1454

Credit GST:

When utilising yearly private apportionment, you are able to make an annual adjustment after claiming a GST credit for any purchases that have a business-related component.


Importations are subject to annual private apportionment in a manner similar to purchases. 

Use the following calculation to determine the amount of the GST credit you can claim for an importation you make for both private and commercial use:

(Full GST credit) × (Extent of the non-input-taxed purpose %)

This formula states:

Full GST credit is the amount of GST credit you would be eligible to claim if the importation: 

  • Was made only for business reasons and
  • Had no connection to producing supplies subject to input tax.

Extent of non-input-taxed purpose is the fraction of the importation that does not relate to making input-taxed supply, represented as a percentage of the entire importation.

Input Taxes on Sales

Use the following calculation to determine the amount of GST credit you can claim if a business-related purchase partially relates to producing input-taxed sales:

  • (Full GST credit) × (Extent of the non-input-taxed purpose %) × (Extent of payment %)

In this formula, the amount you pay (or are required to pay) for the purchase, stated as a percentage of the whole purchase price, is known as the extent of payment.

Calculating GST on an Invoice

To work out GST for an invoice:

Inclusive GST: Divide the entire invoice amount by (1 + GST rate) to get the GST amount.

Exclusive GST: Multiply the subtotal by the GST rate (in decimal form) to get the GST amount.

FAQs: How to Calculate GST

Q1: How do I calculate GST from a total?

The price excluding GST is multiplied by 1.1 to calculate the price with GST. To calculate the GST component of a cost that includes GST, divide the cost by 11.

Q2: Why do you divide by 11 to get GST?

In some countries, such as Australia, where the GST rate is 10%, dividing the entire invoice amount by 11 provides an accurate estimate of the GST cost. It’s not the conventional approach, but it works for this particular rate. Use the formula Total Amount * (GST Rate / 100) for precise calculations.

Q3: Is GST always 10 percent?

No, the Goods and Services Tax (GST) is not consistently 10%. The GST rate might vary from one country to another. Even within a single country, different goods and services may be subject to various GST rates. 

Q4: How do you add GST to a percentage?

Multiply the original amount by the percentage’s decimal equivalent before adding the result to the original value to add GST. To add 10% GST to $100, for example, enter $100 + ($100 * 0.10) = $110.

Q6: How do you calculate the price excluding GST?

Divide the total price (including GST) by (1 + GST rate in decimal form) to get the price minus GST. To determine the price before GST, deduct the outcome from the final cost.

Q7: How do I manually calculate the GST percentage?

Divide the GST amount by the original price (excluding of GST), then multiply the result by 100 to obtain the GST percentage.

I hope this article has increased your understanding of how to calculate GST in Australia and answered all your questions.

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