Sumlin, 48, will be paid $3.1 million a year, The Dallas Morning News reported. Sumlin's previous deal with Texas A&M paid him $2 million.
The Morning News, which posted the contract on its website, said Sumlin, effective April 1, will receive $500,000 in salary with supplemental payments starting at $2.6 million in 2013, going to $2.725 million in 2015 and being reduced to $2.3 million in 2017.
The overall package reportedly includes bonuses for achievements such as winning the SEC title, bowl games appearances and $400,000 should the Aggies win the college football national championship.
Sumlin built a 35-17 record in four seasons at Houston, his first head coaching position, before joining Texas A&M before last season.
The Aggies' 11-2 2012 season included a Cotton Bowl victory while quarterback Johnny Manziel won the Heisman Trophy and offensive tackle Luke Joeckel was awarded the Outland Trophy.
Beyonce flaunts bikini body, Blue Ivy in vacation pics
Couple mistakenly served bag of cash at McDonald's drive-thru