Printable Ma W9 Form – The IRS forms W-9, Request for Taxpayer Identification Number (and Certification) are all commonly used. When you function for a client, or if your business is independent, they may ask that you fill out and return a W-9 to ensure they can prepare the 1099-NEC form accurately and then report the payments you obtain at the close of the year. Printable Ma W9 Form