Based on the facts, FinCEN allows you to make the call whether to list one individual or both for joint owners when one individual deposits the cash.
See FinCEN CTR FAQs #24 -
Since John Smith made a withdrawal from the joint account in excess of $10,000, then the financial institution would list Jane Smith’s information only if it has knowledge that the transaction was also being conducted on her behalf. If the financial institution does not have knowledge that the withdrawal was conducted on behalf of Jane Smith, then it would neither be required to nor prohibited from listing Jane Smith in a second Part I.
Therefore, if the financial institution does not have knowledge that the withdrawal was conducted on behalf of Jane Smith, the financial institution would complete a Part I on John Smith. For Item 2 of Part I, the financial institution would check 2a “Person conducting transaction on own behalf†and complete the applicable information for John Smith. Item 22 for Part I on John Smith would be completed by entering $12,000 and providing the account number affected.
However, if the financial institution does have knowledge the withdrawal was completed on behalf of both John Smith and Jane Smith, the financial institution must complete two Part Is. In completing a Part I on John Smith, the financial institution would check 2a “Person conducting transaction on own behalf†and complete the applicable information for John Smith. In completing a Part I on Jane Smith, the financial institution would check 2c “Person on whose behalf transaction was conducted†and complete the applicable information for Jane Smith. Item 22 for each Part I would be completed similarly by entering $12,000 and providing the account number affected.
_________________________
CRCM, CAMS