Our IR335 Employer's guide explains your obligations if you need to withhold tax from a payment made to a nonresident contractor. Some nonresident contractors are exempt from withholding tax or may apply for a tailored rate.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. If you're a contractor or freelancer, you must fill out your IR330C or risk paying up to 45 percent of your income as tax. Form 1042S is an IRS form used to report amounts paid toand withheld fromtheir noncitizen, nonresident workers. This is a type of income tax deduction, and is also known as tax on schedular payments. Who Has to File Taxes in New Zealand? Who Qualifies as a Tax Resident in New Zealand?