All of our VPS Services are prorate to the 1st of the month. If you order before the 20th, you will pay for what is left of that month only. For example, if you order on July 12th, you will pay for service from July 12th thru July 31st. Your next invoice will be for August 1st. This invoice will have show the amount you were expecting and this will remain for the remainder of the service. If you order after the 20th, you will be billed the remainder of that month plus the next month. For example, If you order on July 23rd, you will be billed for July 23rd thru August 31st. Your next invoice will be due on September 1st.