Do you need to register for GST
Yes, if yearly turnover is $75K or more.
(It’s also compulsory if you want to claim a fuel tax credit, or you're a taxi or ride-sharing driver.)
Optional if yearly turnover is less than $75K.
(You can’t claim GST on expenses if you don’t register.)
Adding GST to your prices
Old price x 1.1 = GST inclusive price
Keep a running tally of the GST you’ve collected on sales.
Do the same for the GST you’ve paid on purchases.
You’ll use these numbers to figure out your GST bill or refund at step 6.
*You will most likely collect more than you pay.
Think of GST as money you’re collecting for the ATO. Treat it as their money and you won’t get caught short.