http://www.ird.govt.nz/income-tax-individual/end-year/ir3/ii...
My favourite part of our tax system is the advice to file if you have "income from an illegal enterprise"
EDIT: Just as a reply to the original point. I'm not sure how complicated the US system is. I'm not trying to say it's bad either, it just seems to me that we have a system similar to the one that is getting lobbied against. And I like our system, it works well for me..