Essentials - $22 a user per month if paid annually or $28 a user per month if paid monthly
Professional - $30 a user per month if paid annually or $38 a user per month if paid monthly
You can add users at any time.
When a new user is added the cost per user is prorated based on the time remaining in the current billing cycle.
If you remove a user before adding a new user, the new user will take the place of the removed user and your plan will not be charged.