GST calculator — add it on, or pull it out.
For tradies who need the GST on a quote or invoice in seconds. Add 10% to a price, or work out the GST already inside a GST-inclusive figure.
Sound familiar?
- “You quoted a price and then weren't sure if GST was on top or already in it.”
- “A client asked for the 'plus GST' figure and you did the maths wrong in your head.”
- “You're near $75k turnover and not sure if you have to register.”
What this tool does
Adds 10% GST to a GST-exclusive price, or extracts the GST from a GST-inclusive amount (divide by 11). Shows the ex-GST, GST and inc-GST figures.
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💡 On a tax invoice, show the GST amount (or state that the total includes GST). If a supplier doesn't quote an ABN, you generally have to withhold 47% — that's separate from GST.
What the law actually says
- •GST is 10% on most goods and services. The GST inside a GST-inclusive price is the price divided by 11.
- •You must register for GST once your turnover reaches $75,000.00 (or you expect it to). Once registered, you charge GST, claim credits on purchases, and lodge a BAS.
- •Guidance only, not financial advice.