It is important that you undertake the timely disabling of automatic renewal else your card will get charged.
- Log in to your control panel at http://www.google.com/a/domain name
- Click Domain settings.
- Click Domain names.
- Uncheck the box next to Automatically renew my domain registration every year.
- Click Save changes.
Finally If you have decided to get rid of a domain name and you would like to disable automatic renewal for your domain registration, you can follow the steps given above.