If you have any doubt about the requirement to withhold, go ahead and do it and use a Form 1042. We break down the essential forms (W-9, W-8BEN, 1099, 1040) and deadlines.Withholding exemption for purposes of chapter 4. Notional principal contract income. Payments made to foreign vendors will be subject to U.S. federal income tax withholding of 30 percent unless: 1. Withholding agent doesn't know the tax residency. In general, if a withholding agent cannot reliably associate a payment with valid documentation (e.g. Form. Learn about three tax considerations for U.S. companies paying independent contractors overseas, including withholding taxes and tax forms. You will then use these forms to report your worldwide income on your US tax return. However, even without tax withholding, tax reporting may still be necessary.