Irs W-9 Form 2021 – The IRS forms W-9, Request for Taxpayer Identification Number (and Certification) are all commonly used. If you have your own business or function as an independent contractor, a client may request that you fill out and send a W-9 so they can accurately prepare your 1099-NEC form and report the payments they make to you at the end of the year. Irs W-9 Form 2021