Use our Invoice Calculator Australia to quickly calculate invoice totals, discounts and GST. Enter your subtotal, choose a discount percentage and calculate the estimated GST and final amount payable.
This calculator is useful for Australian small businesses, freelancers, contractors and service providers who need a quick way to estimate invoice amounts.
How to Calculate an Invoice in Australia
Calculating an invoice usually involves starting with the price of the goods or services, applying any discount, calculating GST where applicable, and adding the GST to determine the final amount payable.
How GST Affects an Invoice
GST is a 10% goods and services tax that applies to many goods and services in Australia. If GST applies to your transaction, the GST amount can affect the final invoice total.
Our calculator uses the GST percentage entered by you, so you can adjust the calculation when needed.
Invoice Calculation Example
Suppose your services total $1,000 and you provide a 10% discount. After the discount, the amount is $900. If 10% GST applies, the GST is $90 and the estimated invoice total is $990.
- Subtotal: $1,000
- Discount: $100
- Amount after discount: $900
- GST: $90
- Total invoice: $990
Who Can Use an Invoice Calculator?
An invoice calculator can be useful for freelancers, contractors, consultants, tradespeople, retailers and small business owners who want to estimate invoice totals quickly.
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Use our Invoice Calculator Australia to calculate your invoice subtotal, discount, GST and final amount payable. This free calculator is designed for Australian businesses, freelancers and contractors.
The Invoice Calculator Australia makes it easy to estimate the total amount on an invoice before sending it to your customer.
How to Use the Invoice Calculator Australia
Enter your subtotal, choose a discount percentage and enter the applicable GST rate. The Invoice Calculator Australia will calculate the discount, GST and estimated final invoice total.
For official information about GST and Australian business tax obligations, visit the Australian Taxation Office GST guidance .
Australian Taxation Office GST guidanceFrequently Asked Questions
What is an invoice calculator?
An invoice calculator helps estimate an invoice total by combining the subtotal, discounts and applicable GST.
How much is GST in Australia?
The standard GST rate in Australia is 10% for taxable supplies. Specific GST treatment can depend on the transaction and business circumstances.
Can I use this calculator for freelance invoices?
Yes. Freelancers and contractors can use the calculator to estimate invoice totals, discounts and GST.
Does this calculator create an official tax invoice?
No. This is a calculation tool only. It does not create or replace an official tax invoice or professional tax advice.
What does the Invoice Calculator Australia calculate?
The Invoice Calculator Australia calculates the subtotal, discount amount, amount after discount, GST and estimated final invoice total.
For official information about GST and Australian business tax obligations, visit the Australian Taxation Office GST guidance.