Hi @leanne sia - 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
Regardless of whether or not you upgrade to Standard or Premium, you will need to pay for all billable users. You can compare our subscriptions at https://trello.com/pricing
Trello will automatically generate the cost of the subscription you choose for you based on the Workspace you want to upgrade. You can upgrade by heading to your Workspace's billing page. You can access this page by opening your Workspace, then opening the sidebar, and selecting 'Workspace settings' > 'Billing'
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