The Subcontractor Onboarding Checklist: Compliance Edition

Most subcontractor disputes are seeded during onboarding. A missing W-9, a COI that doesn't match the contract scope, a lien waiver template that isn't state-compliant — each of these becomes a payment blocker later. Here is the full onboarding checklist that mid-market GCs use to get every new sub set up right the first time.