However using the equation and data sets from this blog post (http://gregmankiw.blogspot.com/2010/03/taxes-per-person.html) results in:
* Ireland: 34.0% × 39,441 = 13,409.9 * New Zealand: 36.5% × 26,625 = 9,718.1
I'm beginning to think "heretic" wasn't trolling the comments.