Jesús The bad news is, there's no easy one-click button to get your last quarter average balance. But the good news is that you can easily export all transactions for any time-range of your choice in CSV format and then open that up in Excel or similar spreadsheet software, and then calculate it yourself. Just go to a sub-account of your choice and then choose "Export statement" to do so. That way you can also find out the balance on specific dates.
Also just out of personal interest: would you mind sharing what country you're from? I've heard that something like this is needed in Italy before.
