AWS enables the invoice balance due information and invoice amount on Billing Console

You can now view ‘Balance Due’ for an invoice and the ‘Invoice Amount’ in the AWS Billing console. The ‘Balance due’ column reflects the total amount outstanding for each invoice, while the ‘Invoice Amount’ reflects the value of the invoice when the invoice was issued to you. The Balance due information is updated periodically, once the funds are realized by AWS.

Source:: Amazon AWS