An overwhelming majority of Major League Soccer players ratified a five-year collective bargaining agreement through the 2019 season.
The MLS Players Union said Thursday that 91 percent of its members approved the deal that was initially announced before the start of the season in March.
MLS owners also signed off on the agreement, which is estimated to boost the average salary for senior players by about $60,000 initially and about $200,000 by 2019.
For the first time, MLS players will have the opportunity to become free agents, but they must be age 28 or older with eight or more years of MLS service and whose contracts expire.
Free agent salary increases will be capped at 25 percent for players making $100,000 or below, 20 percent for those between $100,000 and $200,000, and 15 percent for those at $200,000 or more.
The minimum salary for the first 24 players on a team's roster increases from $60,000 this season to $62,500 in 2016, $65,000 in 2017, $67,500 in 2018 and $70,250 in 2019.
The minimum for the remaining players age 24 or younger will be bumped up from $50,000 this year to $51,500 in 2016, $53,000 in 2017, $54,500 in 2018 and $56,250 in 2019.
For players below the minimum, they receive bonuses of $500 for each MLS game and another $750 for each league start.
Team salary ceilings also will rise from $3.49 million in 2015 to $3.66 million in 2016, $3,845,000 in 2017, $4,035,000 in 2018 and $4.24 million in 2019.
Additional allocation money for each team will be $250,000 this year and next, $300,000 each in 2017 and 2018 and $350,000 in 2019.