The Boston Celtics formally announced the release of training camp invites Chris Babb, Damen Bell-Holter, DeShawn Sims, and Kammron Taylor on Saturday. The roster now stands at 14 players. As president of basketball operations Danny Ainge reaffirmed on Thursday, the team will remain under the luxury tax this season as it navigates the first year of a transition process. The Celtics have 14 guaranteed contracts for a total salary commitment of approximately $71.2 million (and it jumps to $71.6 million for tax purposes). The luxury tax line this season is $71.75 million. "Right now we’re barely under the luxury tax, so we really have no choice," said Ainge. "We will stay under the tax this year. We have to. As we’re rebuilding, not just from a standpoint of the financial budget, but as a competitive advantage." By staying under the tax this season, the Celtics will put themselves in position to collect the rebate that non-taxpaying teams reap (splitting a portion of the money spent by taxpayers). When you consider the bloated bill the Nets alone will pay this season, it's a good season to be below the tax. Staying under the tax can also help Boston avoid repeater penalties moving forward. Bell-Holter, Sims, and Taylor left the team earlier this week with their fate sealed. Babb stuck around through Friday's practice and felt he opened some doors for himself by spending the past month with the Celtics.