Keep a copy of all of your W-9 forms. You will fill out one for each client, so you could have several for the year depending on the number of clients you have.

IRS Form W-9 is most often used by businesses to collect tax information about contractors the business works with. The information on Form W-9 is used to fill out Forms 1098 and 1099 at tax time.

The W-9 is one of the lesser-known forms taxpayers may need to use to report their income and other financial information to the IRS. Pssst…. filed your taxes yet?