Not always true.

Go shopping with a wad of $100.00 bills. Most stores don't accept them, regardless of the amount of purchase, without additional ID.

Try buying a new car, paying for it with $100.00 bills. You might enjoy filling out the paperwork that is required to do so.

It's not necessarily because you are paying with $100 bills. The IRS requires banks and other businesses to report all cash transactions exceeding $10,000 by means of a Currency Transaction Report (CTR). This is a way for the IRS to track money laundering. There happens to be two lines on the form asking for the number of $50 and $100 bills, but those lines are optional. Mike topalovich@terraglyph.com