By Kim Dixon
WASHINGTON, July 10 (Reuters) - Republican presidential candidate Mitt Romney's pitch to slash taxes by 20 percent across-the-board would require cuts of about $320 billion in popular tax breaks to avoid adding to the deficit, a nonpartisan analysis said on Tuesday.
The report by the Tax Policy Center found that to pare tax rates to the level promised by Romney, a third of the $1.1 trillion in so-called federal tax expenditures would have to be axed to prevent the federal budget deficit from growing.
The budget is a key point of political contention this election year. During fiscal 2011, which ended Sept. 30, it totaled $1.296 trillion.
"It won't be impossible to pay for substantial rate reductions by cutting tax expenditures, but it will be very hard," Tax Policy Center fellow Howard Gleckman said of the study.
Popular tax expenditures include deductions for home mortgage interest and individual retirement accounts.
President Barack Obama, who will face Romney in an expected tight election on Nov. 6, revived the tax debate this week by calling again for extending cuts that expire at year's end - but not for households earning more than $250,000 a year.
Obama has blasted Romney's tax plan for disproportionately benefiting the wealthy.
A Romney spokeswoman said the Tax Policy Center's analysis proves Romney's plan to lower rates as part of a "deficit-neutral" tax reform can be achieved.
"This study is independent confirmation that even employing an economic model that ignores the pro-growth effects of reducing tax rates, these goals can be met," spokeswoman Amanda Henneberg said.
Romney's tax proposal also includes cutting some taxes on investment income and eliminating taxes on estates passed on to heirs.
He has not spelled out how he would lower marginal tax rates, but has said broadly he would cut some tax benefits for the wealthy. (Reporting by Kim Dixon; Editing by Xavier Briand)
With A Little Help From My Friends (Joe Cocker)
<strong><a href="http://www.huffingtonpost.com/2012/05/28/mitt-romney-will-not-repu_n_1551540.html" target="_hplink">(May 28, 2012) --</a></strong> Despite a resurgence of <a href="http://www.thedailybeast.com/articles/2012/05/25/mitt-romney-s-new-bff-donald-trump.html" target="_hplink">Donald Trump's birther claims</a>, Romney refused to repudiate the billionaire, who has been helping with his 2012 campaign efforts. "You know, I don't agree with all the people who support me ... I need to get 50.1 percent or more and I'm appreciative to have the help of a lot of good people," Romney said. (Photo by Ethan Miller/Getty Images)
Who Let The Dogs Out (Baha Men)
<strong><a href="http://www.huffingtonpost.com/2012/04/16/mitt-romney-seamus_n_1429925.html" target="_hplink">(April 16, 2012) -- </a></strong> In an interview with ABC's Diane Sawyer, Romney discussed the political fallout over strapping his dog Seamus to a car roof. He admits that he probably would not do it again. (Handout)
It's The End Of The World As We Know It (R.E.M.)
<strong><a href="http://www.huffingtonpost.com/2012/04/04/mitt-romney-medicare-president-obama_n_1403267.html" target="_hplink">WASHINGTON, D.C. (April 4, 2012) --</a></strong> Speaking before the Newspaper Association of America, Romney attacked Barack Obama on his health record, claiming the president "has taken a series of steps that end Medicare as we know it." (Photo: Jim Watson/AFP/Getty Images)
For The Love Of Money (The O'Jays)
<a href="http://www.huffingtonpost.com/2012/03/14/mitt-romney-i-made-a-lot-of-money_n_1345516.html" target="_hplink"><strong>NEW YORK, N.Y. (March 14, 2012) -- </strong></a> Romney became testy on Fox News while discussing his appeal to lower-income voters. On the same day, Occupy Wall Street protesters staged a demonstration outside Mitt's Waldorf Astoria hotel fundraiser. (Photo: Emmanuel Dunand/AFP/Getty Images)
People Are Strange (The Doors)
<strong><a href="http://www.huffingtonpost.com/2012/03/09/mitt-romney-south_n_1334478.html" target="_hplink">PASCAGOULA, Miss. (March 9, 2012) --</a></strong> While on the trail in Alabama and Mississippi, Romney got in touch with his Southern side, learning how to say "y'all" and liking his grits. With those new experiences in hand, he admitted that "strange things are happening to me." (Photo: AP/Evan Vucci)
Pink Cadillac (Bruce Springsteen)
<a href="http://www.huffingtonpost.com/2012/02/24/mitt-romney-cadillac_n_1299740.html" target="_hplink"><strong>DETROIT, Mich. (Feb. 24, 2012) -- </strong></a> While speaking before the Detroit Economic Club at Ford Field, Romney listed not two, not three, but four American-made cars that he and his wife, Ann, owned. Among the vehicles: "a couple of Cadillacs." (Photo: Scott Olson/Getty Images)
It's The Hard-Knock Life (Annie & The Orphans)
<strong><a href="http://www.huffingtonpost.com/2012/02/01/mitt-romney-very-poor_n_1246557.html" target="_hplink">TAMPA, Fla. (Feb. 1, 2012) --</a></strong> In an interview with CNN, Romney noted that he is "not concerned about the very poor," citing the social safety net for that segment of the populace. (Photo: Ethan Miller/Getty Images)
America The Beautiful
<a href="http://www.huffingtonpost.com/2012/01/31/mitt-romney-america-the-beautiful-_n_1243908.html" target="_hplink"><strong>THE VILLAGES, Fla. (Jan. 31, 2012) --</strong></a> On the eve of Florida's primary, Romney led his supporters in a singing of the patriotic song. (Photo: Emmanuel Dunand/AFP/Getty Images)
Successful (Drake, Lil Wayne)
<a href="http://www.huffingtonpost.com/2012/01/19/mitt-romney-tax-returns_n_1217708.html" target="_hplink"> <strong>CHARLESTON, S.C. (Jan. 19, 2012) -- </strong></a> During CNN's GOP debate, Romney refused to commit to disclosing his tax returns, offering no apologies for his success. (Photo: Emmanuel Dunand/AFP/Getty Images)
Bye Bye Bye ('N Sync)
<a href="http://www.huffingtonpost.com/2012/01/09/mitt-romney-i-like-being-able-to-fire-people_n_1194115.html" target="_hplink"><strong>NASHUA, N.H. (Jan. 9, 2012) -- </strong></a> In a speech about insurance options, Romney tells audience members, "I like being able to fire people who provide services to me." (Photo:AP/Charles Dharapak)
Don't Know Why (Norah Jones)
<strong><a href="http://www.huffingtonpost.com/2011/10/28/mitt-romney-embraces-climate-change-denial_n_1063905.html" target="_hplink">PITTSBURGH, Pa. (Oct. 27, 2011) --</a></strong> Back in June 2011, Romney said humans are somewhat tied to climate change. By October, he had reversed course, saying "We don't know what causes climate change." (Photo: Jim Watson/AFP/Getty Images)