Who is require to withhold? • Withholding Agent.The first step is to have the contractor complete Form W9, Request for Taxpayer Identification Number and Certification. Finally, if you read the top of form W-8BEN it says Do NOT use this form. If your business is headquartered in California and your California office hires an independent contractor (IC) who lives and works out-of-state. Secure payments and seamless onboarding. If you are self-employed or an independent contractor, you will need your net income (total after taxes).