About this calculator
Add GST to a price, or work out the GST in a GST-inclusive total.
How it’s calculated
Gross = net × 1.1. Net = gross ÷ 1.1. The GST inside a GST-inclusive price is the total ÷ 11, not 10% of the total.
Worked example
With these inputs:
- Amount
- $1000
- GST rate %
- 10%
- Amount is
- Before tax
the result is:
- Total with tax
- $1,100.00
- Net
- $1,000.00
- GST
- $100.00
- Gross
- $1,100.00
Tips from the trade
- GST is 10% on most building work and materials. You must register once your GST turnover reaches $75,000 a year, and a tax invoice must show your ABN.
Common questions
How do I work out the GST in a price?
Divide the GST-inclusive price by 11. A $1,100 total includes $100 of GST.
Results are estimates for planning and pricing. Check quantities against your drawings, the manufacturer’s data and the NCC and Australian Standards before ordering.