Treasury Secretary nominee Jack Lew is worth between $748,000 and $1.7 million, on par with outgoing secretary Tim Geithner but well below recent predecessors. The Treasury Secretary job pays $199,700 a year.
Paulson is considered the richest Treasury Secretary in history and it's unclear what his actual worth was when he left Treasury. He had to sell about $500 million worth of Goldman stock in 2006 to get the Treasury gig. In 2008, Paulson reported "more than $50 million" in a blind trust, which presumably includes the money from his lucrative Goldman stock sale.