Brown's returns show that Republican incumbent's family income rose significantly after he won his special election for Senate in 2010, jumping from $294,000 in 2009 to almost $840,000 a year later.
Brown released six years worth of tax returns, while Warren released four. Warren's returns show that she and her husband earned nearly $1 million over the past four years, putting her in the top 1 percent of earners, the Globe reports.
Brown has attempted to portray Warren as a member of the elite during the campaign, attacking her for an interest-free loan the Harvard law professor received from the school, as well as her decision to pay a lower tax rate on her most recent Massachusetts tax return.
Brown's earnings, however, put him in the top 2 percent.
The Massachusetts Senate race has been predicted to be the most expensive in the state's history. It has already become one of the more closely watched races in the nation.
10 more election stories from beyond the presidential field:
Chris Christie To Campaign With Scott Walker [Associated Press]
FreedomWorks For America Endorses Conservative Candidate Dan Liljenquist For Utah Senate [FreedomWorks For America]
Delayed Texas GOP Primary Hurts Dewhurst [The Daily Campus]
Gay Community Applauds Brian Sims' Win For State House [Philadelphia Inquirer]
Austin Approves New Campaign Finance Rules [Austin American Statesman]
Candidate Touts Professional Experience [Marshall News Messenger]
Florida Republicans Try To Tap Voter Anger Over Gas Prices With Rally In Tampa [Tampa Bay Times]
New Poll Shows Mourdock Leading Lugar By Five Points [Fox 59]
Four Congressional Races, Just One Debate [Idaho Statesman]
Democratic-Sponsored Poll Shows Berg, Heitkamp In Close Contest [ND Politics]