I'm going to give the IRD a call re: this question, but thought it could be useful to see what GZer's think.
I'm helping someone to work out whether they are "self-employed" or "employed" for tax purposes. This person doesn't particularly care which way it goes. IRD have a pamphlet IR336 which provides some guidance as to whether a person is "self employed" or "employed." Based on the answers, the situation I'm researching would probably come out "employed." But what would be the consequence if they designated themselves as "self-employed"?
The way I see it, if they are self-employed they would invoice their client for the work they do (and it's between them and their client how much, and on what basis they bill for their work), and it's up to the self-employed person to sort out their own tax. In this scenario, they would set aside the anticipated income tax, ACC earner levy, and student loan repayments, and then file an IR3 at the end of the tax year in 2020. In this particular case, it should be reasonably straightforward, for some short-term contract work. But using the guidance material from IRD they probably are more correctly classed as an employee. Is there a consequence for acting as a self-employed person when they should be treated as an employee?