GST on your quotes
One question decides it: are you registered for GST? How Karven adds GST, where to change your answer, and what a tax invoice needs.
Updated 2026-10-22
GST in Karven comes down to one question: are you registered for GST?
- Yes: your quotes add 10% GST on top of your prices and show the total including GST.
- No: your quotes don't add GST, and the total is labelled "Total (no GST)".
You answer it when you set up. Change it any time in Settings → Business details → Registered for GST?, for example in the month you register. New quotes follow your answer.
If you haven't answered yet, the quote editor asks you at the top. Until you answer, quotes don't add GST, and the editor shows GST: not set.
On a single quote
Under the total, the quote editor shows a line like GST: registered, 10% added. There's no tick box on the quote: GST always follows your setting, so you can't add GST by mistake when you're not registered. To change it, tap change in Business details.
A quote you already saved keeps the GST it was saved with when you edit it. A re-quote or a copy is a new quote, so it follows your setting.
When you have to register
You must register for GST once your business turns over $75,000 a year (or expects to). Below that it's your choice. Your accountant or the ATO can tell you which applies to you.
Adding it up by hand
Your prices go in without GST, and Karven adds 10% on top. If you're checking a total that already includes GST, the GST in it is the total divided by 11, not 10% of the total.
What a tax invoice needs
If you're registered and an invoice is for $82.50 or more including GST, the ATO says it must show:
- that it's a tax invoice
- your business name and ABN
- the date it was issued
- what you supplied
- the GST amount, or that the total includes GST
For $1,000 or more, it must also show the customer's name or ABN.
Karven's invoices carry your business name, ABN and the GST, so fill in your ABN in Settings → Business details before you send your first invoice.
Materials you on-sell
When you buy materials and charge them on to the customer with a markup, you charge GST on your sell price. You claim the GST you paid the supplier back on your BAS as normal.
Subbies
If a subbie is registered for GST, their invoice to you includes GST and you claim it back. If you raise the invoice for them, see RCTI.
Was this useful?
If anything's unclear or out of date, email info@karven.com.au and we'll fix it.