How to check what is owed on your iTunes account

You can owe iTunes money, because I do! I use a debit card ( in the USA ) and I don't have enough in my account to cover what I bought on iTunes, now I can't buy or download anything until I put more money in my debit card to cover what I owe! This happens because iTunes often doesn't charge your card until days, or sometimes a week after the purchase...stupid I know, when I pay for something I expect it to be taking out then!! How to check just go to Apple ID>account>purchase history !