Our IR335 Employer's guide explains your obligations if you need to withhold tax from a payment made to a nonresident contractor. Read our stepbystep guide to learn how to comply with New Zealand's labor laws, including how to classify, manage, and pay your New Zealand contractors.Get a comprehensive understanding of the tax system for expats in New Zealand. Our guide covers everything from income tax rates to tax treaties and more. Describes the various scenarios when withholding tax (WHT) occurs and how to address it in New Zealand. NRCT works like an interim withholding tax, which is collected from the non-resident contractor's payments and paid to Inland Revenue. Zealand, and Switzerland.