not aware of that requirement.... it is true that BANKS are required by law to report any transaction that exceeds $10,000 to the IRS per the Currency and Foreign Transactions Reporting Act...... but where is the requirement that the person who makes the deposit or withdrawal have a paper trail? Yes, it would be prudent to be able to support where the $10,000 came from or went to if asked by governmental authorities, but not confident there is any legal requirement to maintain such records.
