You must register for GST if you carry out taxable activity and your turnover was 60,000 or more in the last 12 months, or if GST is included in your prices. Check if you need to register for GST, Get an IRD number, Choose how to you want to claim and return GST, Decide how often you need to file your GST returns, Find your business description and code, Register for GST with myIR Secure Online Services, Find out what you need to do now that you are registered.