http://www.irs.gov/compliance/enforc...113003,00.html
It doesnt matter what you are buying...... a car, boat, RV, groceries, beer, etc......if the transaction is more than $10,000 and was paid for in cash, ALL business must fill out an IRS form and send it to the feds. I use to work in a grocery store while I was in college and we would have people come in and wire money to different places all over the world. If it was over a certain amount, we had to have their SSN to fill out some forms. A lot of these laws have been around for decades but they got a lot stricter after 9/11.