Thank you for reaching out to us through the Community! Your billing invoice is based on which payment plan you are in as well as how many active contacts you have within your database in the current month. If your number of active contacts go over the limit of a specific price tier within the month, then you will automatically be charged for the new price tier. If you reduce the number of active contacts before the start of the next month, you will pay the previous price tier amount. For your privacy we cannot disclose billing information within this public thread. If you have any further questions please contact our Billing department. Their information can be found by clicking here. Let me know if I can help out with anything else!