Some financial institutions impose limits on external transfers. For security reasons, some banks have external banking transaction limits that tie to the transaction, day, or month. For example, a bank may limit external transactions to $5,000 per transaction, $10,000 per day, and $50,000 per month. Other financial institutions impose limits on the number of external transactions you're allowed to perform. This limit is often tied to the day and/or month (i.e. no more than three external transactions in a single day and no more than ten in a single month).