On the web
To see your Microsoft account balance, sign in to the Payment options page with your Microsoft account.
On your Xbox One
You can check your Microsoft account balance on your Xbox One console without going online.
Select System > Settings > Account > Payment & billing. To help protect your account, you may be asked to enter your password.
You’ll see Payment options, where your balance is shown under Microsoft account. If you have several payment options, you may have to scroll right to see it.