For purposes of salary arbitration and free agency, a player acquires a year of service time if the player remains on the major league roster for at least 172 days of a typical 187-day season. Players may either be active, meaning that they are eligible to play in games, or on the
injured list. According to the 2022–2026
collective bargaining agreement (CBA), an MLB player earns service time in one-day increments, up to 172 days, equaling one year, per season. Six years of service time is a key metric for eligibility for free agency. Commentators have noted that the rules of service time create a
perverse incentive for teams to avoid putting their best players on the major league roster for the entire season to save money and to retain control over their players for an extra season. After several high profile examples of service time manipulation had been alleged in the 2010s and 2020s, MLB's new CBA to end the
2021–22 lockout included provisions to increase service time eligibility. The top two finishers in Rookie of the Year voting in each league are automatically awarded a full year of service, regardless of how much they actually accrued that year. Teams will receive
extra draft picks as compensation for promoting young players to their Opening Day roster who later finish in the top 3 in the Rookie of the Year voting or in the top 5 in
Most Valuable Player or
Cy Young Award voting. ==Examples==