<prompt> Human: If I plan on not to take their financing route, why do they still tell us that is a law to provide my SSN?If i have my own pre approved finance, why do they care about my SSN?My wife got hit by this and she wasnt happy, but gave in to their demands of providing it.  <response>: Yes. The IRS requires it, or they believe that they do.They are required to report any transaction over 10,000 made in cash to the IRS. In addition, certain transactions are designated reporting transaction source which include cars that sell for over 10,000.Whether or not they have to report it really depends on the actual method of payment check vs cashiers check vs wire, and I suspect most car dealers default to always reporting over 10,000. 