Upon the account activation, your new billing period opens. It defines WHEN the system charges the fees. For fee types see Online Price.
A new billing period opens:

• when your account is activated after signup
• when your suspended account gets resumed
• when you switch to another plan
• when you change your billing period

A billing period closes:

• when you quit hosting
• when your account gets suspended
• when you switch to another plan
• when you change your billing period