Each contract must be evaluated separately. When a US company hires independent contractors who are US residents, it should have contractors complete Form W9.You'll need to solicit applicants, review their applications, and make an offer with an independent contractor agreement. Having a written independent contractor agreement is a fundamental element of successfully managing this relationship. An independent contractor agreement is a contract between a freelancer and a client outlining work specifics. Complete and submit the 08215 Contract Agreement . 4. Vendors must provide all requested data and agree to all certifications and assurances. 5. The Contractor will provide all personnel, equipment, facilities, and supplies necessary to perform the Services, except as set forth in the applicable SOW. Washington state businesses that have noncompetition agreements with employees or independent contractors will be subject to new requirements. When a US company hires independent contractors who are US residents, it should have contractors complete Form W9.