Total Due is the total account balance. This includes any unpaid balances from previous invoices. 

The Due Date for the invoice can be seen under the Total due section.

Account Summary shows the amount of the last statement, payments received, and new charges. The amount of the last statement is the total due from the previous invoice. 

Payments Received shows the total of any payments made during the previous billing period. 

New Charge shows the total of any new charges from the most recent billing period.

Recurring Charges shows the recurring monthly charges, overages charges, taxes and fees and adjustments for the most recent billing period. 

You can see a breakdown of the new charges under your account summary.