(CNN) – Democratic Massachusetts Senate candidate Elizabeth Warren's campaign released the last four years of her tax returns Friday, reporting income that peaked at nearly $981,000 in 2009.
Warren, the former consumer protection advocate and Harvard professor, and her husband, Bruce Mann, reported earning $831,021 in 2008, $980,670 in 2009, $954,721 in 2010 and $616,181 in 2011.
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In 2011, they paid $191,052 in state and federal taxes and contributed 2.8% of their total income to charity, or $17,209.
Warren's rival, incumbent Republican Sen. Scott Brown, released six years of figures earlier in the day Friday that showed the first term senator earned more once he entered the Senate. He reported earning $357,251 in 2006, $275,921 in 2007, $287,906 in 2008, $249,206 in 2009, $839,520 in 2010, his first year serving in the upper chamber and $510,856 in 2011.
The Browns paid $123,642 in taxes in 2011, or an effective tax rate of 24.2% and contributed $16,487, or 3.2% of their total income to charity.
The candidate's tax returns became the latest sticking point between the two in the escalating battle over the Senate seat Brown won in a special election after Sen. Ted Kennedy passed away in 2009.
After The Boston Globe called for both candidates to release their returns earlier in the year, Brown took up the mantle on Tuesday, saying he would release six years worth of returns. Warren responded saying she would release four years worth, the amount of time she spent in public service.
The Brown campaign criticized Warren's time frame, suggesting she was trying to hide something, but a spokeswoman for Warren said she is offering a "full" record of her finances.
"Elizabeth is not a career politician like Senator Brown, but she will release her tax returns for her entire time in public service and by releasing 4 years of returns, she is providing the people of Massachusetts with a transparent and full accounting of her financial situation," spokeswoman Althea Harney said in an email to CNN.
Both sides are playing politics with the issue, attempting to use the returns to help craft a negative image of their opponent and contribute to their personal narratives.
Brown has pointed to Warren's personal wealth while trying to protect his image as an everyman. He memorably traveled around the state in 2009 and 2010 in his pick-up truck talking to voters. Warren is marketing herself as a champion of the middle class, pushing back against GOP criticism that her wealth makes her an unsuitable voice for the average Massachusetts voter.