Independent Earner Tax Credit (IETC) component of calculation:

 source 

https://calculate.co.nz/paye-calculator.php

quote:

a gross salary of $47,500.00 NZD per year

1. As this salary is not between $24,000.00 and $44,000.00 the credit is lowered $0.13 per $1.00 earned above $44,000.00
   ($47,500.00 - $44,000.00 = $3,500.00
   $3,500.00 * $0.13 = $455.00
   $520.00 - $455.00 = $65.00)
   This person receives an IETC credit of $65.00