For example, if John & Jane Doe are joint account holders and John Doe made a $12,000 deposit into the account, you would complete two Part I’s. One on John Doe, marking item 2a “Person conducting transaction on own behalf” and entering $12,000 and the account number in item 21 Cash In. Then, you would need another Part I on Jane Doe, but marking 2c “Person on whose behalf transaction was conducted” and entering $12,000 and the account number in item 21 Cash In. (If both John Doe and Jane Doe each made deposits, you would mark 2a “Person conducting transaction on own behalf” in each of their respective Part I’s).