On Thursday, the NFL's Player Association released the annual Salary Cap "carryover amounts" from the 2015 season and into 2016.
Established by the 2011 CBA; Article 13, Section 6 gives teams the ability to carry over unused salary cap space from the previous year towards use for the coming year. In order for the transaction to be official, teams must supply the NFL's league office with written notice no later than two weeks before the beginning of the next league year. For example, say a team had not used $10M of salary cap space in 2015. In 2016, if the salary cap is $155M, the team would have a $165M cap-spending limit ($155M + carryover).
Carryover amounts had a wide range this year: from the Jaguars with $32,774,928 in carryover to the Seahawks with a mere $11,587. In short terms, Seattle was $11,000 under the cap in 2015 -- and the Jaguars, nearly $33M under the cap. In relation to the application of the rule, the NFLPA went into further detail:
"Under the current CBA, Clubs have minimum cash spending requirements. For the years 2013-2016, Clubs are required to spend an average of 89% of the Salary Cap over the four-year period. League-wide, Clubs must spend an average of 95% of the Salary Cap over the four-year period. Once the 2016 salary cap is set, the carryover amount and other adjustments from the 2015 season will be combined for each team's official salary cap position."
Here is an image the NFLPA sent out listing the carryover amounts for each team: