Yes. If you are using month-to-month pricing, then you can move up in tier at any time as needed. If the change happens during the middle of a monthly billing cycle, we will simply charge for the difference between tier levels. You can also move down in tier level at the start of any new monthly billing cycle. If you are using our annual pricing to receive a discount, then you can move up in tier at any time by paying the difference between tier levels for the number of months remaining on the annual plan.