A Business License is an annual tax you pay each calendar year for doing business within the unincorporated area of the County of Alameda. The first step is to have the contractor complete Form W9, Request for Taxpayer Identification Number and Certification.Browse 203 ALAMEDA, CA 1099 CONTRACTOR jobs from companies (hiring now) with openings. Find job opportunities near you and apply! The W8 BEN is essentially the W9 for international workers.