The capacity reporting can be found in the reporting section of the dashboard menu:
While some organization may plan capacity on their users, some others may start with their projects. But in both cases, a good overview reporting will help to ensure that both sides are tying up! Teambook also offers a capacity report based on the tags.
Note that you may choose the time horizon, from 6 month to 2 years. And the color codes indicate projects that are over/under-staffed (maybe the manager will have to do some re-allocations!) and users that planned over or under their capacity (-> maybe it is time to hire !).
Last, report's data can be exported.