A Senate campaign being fought over middle-class values is being waged by a pair of 1 percenters.

US Sen. Scott Brown and Democratic challenger Elizabeth Warren released tax return information on Friday indicating they are among the state’s economic elite. Brown and his wife reported total income of nearly $511,000 in 2011, while Warren and her husband made $616,181.

The Massachusetts Revenue Department tracks filers by income and the latest data, from 2009, indicates anyone earning more than $448,000 is a member of the top 1 percent of earners, a club of 33,870 tax filers who, combined as a group, accounted for nearly 20 percent of the state’s income and paid 22 percent of its taxes.

The threshold for the 1 percent club doesn’t change dramatically from year to year so it’s likely both Brown and Warren are still in the 1 percent.

Brown became a member of the 1 percent club recently, while Warren has been a member for some time. Brown’s income bounced around between $287,906 and $357,251 between 2006 and 2009 before ballooning to $839,520 in 2010 on the strength of a book deal. He didn’t make the 1 percent club in 2009 with only $294,206 in income.

Both candidates have sought to portray themselves as everyday people as they pursue voters who tend to view themselves as middle class. Aside from his book, Brown and his wife derive most of their income from his job as a US senator, his work in the National Guard, and her job as a TV reporter. Warren and her husband derive most of their income from their faculty jobs at Harvard University.

Brown allowed reporters to review his entire state and federal tax returns for 2006 to 2011 at his campaign office, while Warren posted two pages from her federal and three pages from her state tax returns for 2008 to 2011 on her website.

Here are some observations from the tax returns:

Neither candidate seems to be a big investor. Brown reported little interest ($235) or dividend ($2,404) income in 2011. (Brown reported buying shares in Tesla, the electric car maker, for $1,994 in March and selling them for $2,680 in December.) Warren reported $8,150 in interest income and $3,130 in dividends for 2011.

Business income: Brown reported $263,291 in business income in 2011, primarily from his book, while Warren reported $59,688. Among his business costs was a tab for $1,401 for “TV makeup and grooming.” He incurred a charge of $2,149 for “TV makeup and grooming” in 2010.

Rental income: Warren reported $8,666 in personal property rental income, but no information on how that was derived. Brown reported rental payments of $13,500 and $9,750 during 2011 on two condos he owns at 1840 Commonwealth Avenue in Boston. He loses money on the condo rentals every year.

Charitable donations: As his income has increased, Brown has donated more to charity. In 2006, he donated a 1997 Saab and a horse to charity, taking a $9,609 deduction. His giving dipped to $3,959 in 2007 but then steadily rose until it hit $16,487 last year. Warren donated around $26,000 each year from 2008 to 2010 before lowering her donation level to $17,209 in 2011.

Buffett Rule: The two candidates have taken opposing stands on the so-called Buffett Rule, which would impose a minimum 30 percent tax rate on people making more than $1 million a year. Brown opposes the rule while Warren favors it. Neither candidate would be subject to the Buffett Rule, although Warren flirted with a $1 million income in 2009 ($980,670) and again in 2010 ($954,721). Brown paid an effective tax rate of 24.2 percent in 2011, while Warren’s tax rate was 26.1 percent.

2011 tax comparison