The Account Summary section of QuickBooks Online's Custom Form Styles settings shows your transaction history for a customer's account. It includes: Balance Forward, Payments and Credits, New Charges, and Total Amount Due.
How To Enable the Account Summary
1. Choose the Gear icon on the top right then Custom Form Styles
2. In the Action column for the form you are using, click Edit
3. Choose the Content tab, and select the pencil icon in the Account Summary box on the right
4. Check the box for Show on invoice
The Account Summary is now enabled and you will see it featured on all future invoices. If you are interested in learning more about invoice presentation, here is a link to information about QuickBooks' custom form styles. If you use LeanLaw Payments and are interested in displaying an account summary on those invoices, click here.