On June 19, 2008, Harris signed a contract extension with the Chicago Bears for $40 million over four years. It also included a $8.5 million Pro Bowl bonus, which he would receive if he made it to the Pro Bowl in 2008, 2009, and 2010. He could've made an additional $2 million based on performance. It also included $17 million in guarantees and made Harris the highest paid defensive tackle in the NFL. That salary has since been surpassed by Ndamukong Suh.