The form confirms that the contractor isn't a U.S. citizen and isn't working within the United States. If both of these things are true, the contractor isn't subject to American taxes. Without this form, you must withhold 30% of your payments to foreign contractors for taxes.
Non-resident withholding tax is imposed on every person who derives non-resident withholding income such as interest and dividends. NRWT is generally a final tax on such income. Non-resident withholding tax is imposed on interest at 15 percent, and dividends at 30 percent or 0 percent if fully imputed.
Withholding tax on payments to non-resident contractors The default rate is currently 15%. Higher rates are used if the form is not complete. These are called 'no-notification' rates. You will need an IRD number unless you have full tax relief under a treaty between New Zealand and your country of tax residence.
Form 1099-NEC and 1099-MISC: If your business pays a foreign contractor with a temporary TIN (ITIN) $600 or more for services provided within the United States, then you can file Form 1099-NEC or Form 1099-MISC to report these payments to the IRS.
Under US domestic tax laws, a foreign person generally is subject to 30% US tax on the gross amount of certain US-source income.
Without this form, you must withhold 30% of your payments to foreign contractors for taxes. IRS Form W-8BEN-E is similar but is for foreign businesses rather than individuals. For example, if you work with a foreign contractor who has formed a business entity, they may need to file W-8BEN-E instead of W-8BEN.
The income tax treaty in effect between the United States and New Zealand governments overrides the income tax law of each country. It is based on the OECD model tax treaty with some variations and was updated in 2011.