The withholding rate is 7 percent of the following: Gross payments made to nonresident independent contractors for services performed in California. You need FormW8BEN, which is a Certificate of Foreign Status of Beneficial Owner for United States Tax Withholding and Reporting.Paying international contractors requires quick and compliant payments. Learn payment options and the importance of ensuring compliance. The withholding rate is 7 percent of the following: • Gross payments made to nonresident independent contractors for services performed in California. The withholding rate is 7 percent of the following: • Gross payments made to nonresident independent contractors for services performed in California. The equivalent form for overseas contractors is W8BEN.