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For non-residents & visitors: Double tax agreements
You may be a tax resident in both New Zealand and another country or territory. This means that you are a resident in two countries or territories and subject to the tax laws of each.
If both countries or territories tax their residents on worldwide income you could be taxed twice on the same income. Double tax agreements (DTAs) have been negotiated between New Zealand and many other countries or territories to decide which country or territory has the first or sole right to tax specific types of income.