I paid cash into my account, but the cheque I wrote still bounced. Why?
In some banks, unless the cash is paid into the branch of the bank where you account is held, the paper bank giro credit slip showing details of the cash amount paid in would still have to pass through the central paper credit clearing (which mimics that for cheques). The paper credit takes the same amount of time to pass through the clearing as a cheque so you would have to pay in the cash on the same day, or before, the cheque is deposited to ensure funds are available to pay the cheque.