Google AdWords upgrades billing

To improve the overall AdWords billing experience, Google is upgrading most AdWords accounts to a new billing system over the next few months. The updated Billing Summary page will continue to reflect detailed information regarding account charges and activity, and will include the following changes:

- The outstanding balance will now reflect the cost of accrued clicks since you were last charged to help you estimate upcoming charges for your campaigns. However, this amount does not necessarily reflect a delinquent amount or a final balance due.

- Your ad delivery period will reflect more specific date ranges. Your clicks will be itemized only for the particular month you are viewing to help make reconciling your charges easier. Google recommends that you use the advertising costs page for each month (which lists your click and charge details per campaign per month) when reconciling your billing summary.

source from Google...