The Boston Celtics are set to hand out the richest contract in NBA history for the second consecutive summer.

The team is finalizing an extension with star Jayson Tatum on a five-year supermax contract worth $314 million, according to league insider Shams Charania of The Athletic and Stadium.

This agreement, the new largest deal in NBA history, will keep Tatum in Boston until the end of the 2029-30 NBA season.

Tatum still has two years left on his current deal, which will pay him $34.8 million in 2024-25. He also has a player option worth $37 million in 2025-26, which he will decline in favor of the new contract.

Fresh off his first NBA championship, Tatum is regarded as the best player in the Celtics, despite losing out on the 2024 NBA Finals MVP award to teammate Jaylen Brown.

The 26-year-old has made the All-NBA First Team for the past three seasons and the NBA All-Star Game in the last five seasons.

Jayson Tatum surpasses Jaylen Brown for NBA's richest contract

Tatum's incredible new deal surpasses teammate Jaylen Brown for the richest contract in NBA history.

Brown previously signed a five-year contract worth $304 million last summer, breaking the previous record set by Nikola Jokic's five-year supermax extension with the Denver Nuggets worth $270 million signed in 2022.

The 27-year-old forward rewarded the Celtics with the best playoff run of his career, winning the Eastern Conference Finals MVP and NBA Finals MVP en route to the team's record-breaking 18th NBA championship.