The Invoice Summary page shows you a summary of all invoice activities for the current and previous months. You can see a summary of what was invoiced vs. what was collected, totals of all adjustments made, and so on.
For any given time range, it is possible that the values above will not sum up to $0.00. This is because payments and charges against these invoices may not necessarily have taken place during the same time range.
Examples of this include:
Payments from previous periods can later be allocated to existing outstanding invoices.
Refunds may be applied to payments outside that period, not linked to either outstanding or invoiced amounts.