Irs W 9 Fillable Form Free – Form W-9–Request for Taxpayer Identification Number and Certification–is a generally used IRS form. If you have your personal company or function as an independent contractor, a client may request that you fill out and send a W-9 so they are able to accurately prepare your 1099-NEC form and report the payments they make to you at the end of the year. Irs W 9 Fillable Form Free