There are a variety of reasons why you may be asked to provide your Social Security number (SSN):
For Sportsbook and Casino
SSNs are used to verify the identity of players for regulatory purposes.
In addition, customers will be asked to complete an IRS Forms W-9 or W-8BEN after a Big Win. This information will be used by DraftKings to prepare informational reporting tax forms (i.e. IRS Form W-2G).
For Daily Fantasy Sports
Daily Fantasy Sports customers may be required to provide their SSN in certain cases, specifically when they have problems with identity (ID) verification. The SSN helps DraftKings verify the identity of players and prepare informational reporting tax forms (IRS Form 1099-Misc).
For taxation purposes
What do you do with my information?