Self-employed people carry out business activity on their own. Self-employment includes contracting, working as a sole trader and small business owners.
Usually, a self-employed person can start in business without following any formal or legal set up tasks.
If you're self-employed you use your individual IRD number to pay tax. You pay tax on net profit by filing an individual income return.
You can claim back expenses for business activity that you carry out. You need to register for GST if you earn over $60,000 a year.