If a player signs a contract after receiving the transition tag, his original team cannot use the tag again on any player until the contract has expired. The exception is if the player first signs a transition offer sheet, which is a one-year contract equal to the average salary of the top ten players in the league at the player's position, or a twenty percent salary increase, whichever is greater. This contract was not historically guaranteed; however, it became guaranteed starting in 2007 per the collective bargaining agreement agreed to by the NFL owners and the NFLPA on March 8, 2006. If the player signs the offer sheet prior to a long-term contract, the player's team can then use the tag the next year.