Kiffin, who was fired after the fifth game of the 2013 football season, earned about $3.4 million in total compensation, according to the school's federal tax return for that fiscal year.
The period covers July 1, 2013, to June 30, 2014. Records for the 2014-15 fiscal year were not available. USC provided the return in response to a request from The Times.
Kiffin was fired after the Trojans suffered a 62-41 loss at Arizona State in September 2013. Alabama hired him as offensive coordinator in January 2014.
Kiffin was paid a base salary of $2,169,447 by USC in fiscal 2013-14. He also earned $1,166,272 in other reportable income, $25,500 in retirement and other deferred compensation and $14,015 in nontaxable benefits.
USC finished 9-4 in Sarkisian's first season.
Enfield is 23-41 overall and 5-31 in Pac-12 Conference play in two seasons.
O'Neill, who was fired in January 2013 of the 2012-13 basketball season, earned $61,368 in base salary, $100,000 in bonuses and incentives, $1,438,864 in other reportable income, $12,500 in retirement and other deferred compensation and $1,009 in nontaxable benefits.
Athletic Director Pat Haden earned about $2.5 million in total compensation, about $100,000 more than the previous year.
Haden earned a base salary of $1,332,005, an additional $900,000 in bonuses and incentives, $231,167 in other reportable income, $25,500 in retirement and other deferred compensation and $21,227 in nontaxable benefits.