user_6c0eao Good afternoon! Thank you for reaching out to our Xfinity Forums Team regarding your billing. We bill a month in advance for internet services, so usually you are already into the month we've billed for. However, if you were to stop services, any prorated adjustment would be applied back to your account for days that haven't been used. Please feel free to let me know if there are any follow-up questions I may answer for you!