Thanks very much every one. Lots of useful info.
Here is some more background:
The contract will be for a fixed term of 6 months and there will be no IT recruiter agency involved.
It is very likely that there will be work after that time but it is almost certain that it will be as an employee.
Given the above, my questions are:
How should I work? Sole trader, one man company or umbrella company such as Hnry?
I have worked as a one man company in the UK, or through umbrella companies in Germany, Belgium and Ireland.
Since this is only for 6 months, my initial thought is to go with an umbrella company.
How do I work out my rate?
I have never had to do this before. An agency has always been involved and I perceive this as a valuable service.
What can I reasonably expense?
I do not want to take the piss but nor do I want to make an extra donation to the govt.
Can I expense travel to the client's site, the proportion of my rent that can be assigned to home-office, part of my ISP bill, computer hardware?
Did I miss anything?
What about Kiwi saver?
If I use an umbrella company, do I need an accountant?
Do I need xero if I use an umbrella company?