New Zealand: Calculation of GST in Sales

New Zealand: Calculation of GST in Sales

GST is backwards-calculated from the Total Amount inc. Tax.

For example, in this example transaction, the total of the selling prices is 415.42:

This is backwards-calculated to be $54.19 GST, using the same methods and achieving the same results as the GST calculated documented at these official sites:

http://www.gstcalculator.co.nz

http://gstcal.co.nz.