Numbers of collaborators for trello premium

[楊千慧]

I'm with Trello premium but the system keeps telling me that I cannot add collaborators into my workspace and boards, if I wanna add people in I have to pay $10/person to be able to add them in, which doesn't really make sense. I wonder how can I solve this problem? 

[Alex W]

Hi @楊千慧 - welcome to the Community!

All boards created in Trello need to sit in a workspace. Upgrading a Workspace is the primary way of upgrading to a paid plan in Trello, and free workspaces can only have a maximum of ten boards open at a time. When you upgrade to Standard or Premium, all users that are considered billable within your workspace will go towards your monthly or annual bill.

Billable users in Standard and Premium are the following:

• Users that have been added directly to the upgraded workspace
• Multi-board guests: users that have been added to two or more boards in the upgraded workspace

Single-board guests - users that have been added to one board in the workspace - are not considered billable users. You can read more about how billing works with Standard and Premium here: https://help.trello.com/article/855-how-billing-works-with-trello-business-class