W 9 Form 2021 In Spanish – The IRS forms W-9, Request for Taxpayer Identification Number (and Certification) are all generally used. Clients may ask you to fill out and submit a W-9 form if you are a sole proprietor or independent contractor. They’ll use this information to prepare your 1099 NEC form accurately and report all payments at the finish. W 9 Form 2021 In Spanish