Answer:
If the transaction by itself triggers the filing of a CTR, the bank is required to obtain the information necessary for completion of the CTR. That information includes a Social Security number or ITIN for those individuals who have them.
If the transaction is for a smaller amount, any requirement for obtaining the SSN or ITIN depends on the bank's policies and procedures. Some banks have procedures calling for that information for transactions of $3,000 or more, for example, to be used if aggregated transactions would trigger a CTR filing.
First published on BankersOnline.com 8/02/10