Taxable income in New Zealand is based on the following:
company income is taxed at the rate of 28%
Non-resident tax withholding is a flat rate of 15%
tax year: Apr. 1- Mar. 31
Tax are made in 3 installments:
Capital gains: generally not on New Zealand investments but applies to foreign debt and equity investments.
Income from overseas investments or pensions can be exempted from New Zealand tax for your first 4 years of living there, if you are obliged for transitional tax resident status.
source: Inland Revenue Department