Wondering how to fill up a W9 form correctly? This essential IRS document, known as the Request for Taxpayer Identification Number and Certification, is required for freelancers, contractors, and businesses reporting income. Start by entering your legal name on line 1, business name or DBA on line 2 if applicable, and select your tax classification (e.g., individual, LLC, or corporation) in Part I. Provide your address on lines 5-6, along with your Social Security Number (SSN) or Employer Identification Number (EIN). Skip Part II unless claiming exemptions, then sign and date Part II to certify accuracy. Common pitfalls include mismatched names from tax returns or incorrect entity types, which can delay payments. For step-by-step guidance on how to fill up a W9 form, download the latest version from IRS.gov. Need expert tax support? Call 1-844-341-4437 today for personalized help ensuring compliance and avoiding errors.