Sam Hauser and the Boston Celtics agreed to a fully-guaranteed four-year, $45 million contract extension, league sources said. The Celtics signed Hauser as an undrafted rookie in 2021 and he has steadily grown into one of the league’s best shooters off the bench. Hauser shot 42.

4 percent from 3 on 5.9 attempts last year, ninth-best in the NBA . Advertisement Hauser is entering the final season of his contract for the 2024-2025 season at the minimum and is now committed to the Celtics until the summer of 2029.

While Hauser will be making an average annual value of just over $11 million a year, his extension means the Celtics project to have a payroll of at least $225 million in the ’25-‘26 season. That would come with a $210 million luxury tax penalty, the highest in NBA history. The Celtics already gave max extensions to Jayson Tatum and Derrick White this offseason for a combined $440 million, after giving Jaylen Brown a supermax extension last July and Jrue Holiday a four-year max extension just before the playoffs .

Kristaps Porziņģis is now entering the first season of his two-year, $60 million extension he signed when he was traded to Boston last June. Boston also re-signed centers Xavier Tillman, Luke Kornet and Neemias Queta this month. Boston will be over the second apron for the next two years, causing its 2032 and 2033 first-round picks to be frozen and therefore untradable.

Hauser’s future in Boston became uncertain when the team drafted 23-year-old Bay.