WASHINGTON -- Mitt Romney accumulated more than $25 million in foreign income between 2005 and 2010, while he was governor of Massachusetts and a presidential candidate, according to an analysis of his 2010 tax return.

The 2010 return lists foreign tax payments Romney made dating back to 2000. By Romney standards, the payments were modest through 2004, averaging $37,000 a year. In 2005, however, his foreign tax bill shot up to $333,149 and stayed high for the next three years, before dipping in 2009, as the financial crisis hit hard.

In 2010, Romney's foreign tax bill was down to $67,173 on declared foreign income of $1,525,982. That's a 4.4 percent rate. After expenses and various other deductions, Romney declared a net foreign income of $392,000, making his net tax rate 17 percent.

Because the presumptive GOP presidential nominee has so far declined to release his earlier tax returns, HuffPost made a rough calculation of his prior foreign earnings by assuming he paid similar tax rates in previous years.

Using that analysis, paying $333,000 in taxes would translate into gross foreign income of $7.5 million in 2005, or net income of $1.9 million. Even using the much-reduced net income figure, Romney would have earned $7 million in foreign income from 2005 to 2010.

Romney was elected governor of Massachusetts in 2002 and served a four-year term, during which time he took no paycheck from the state. He began running for president while still governor and continued until early 2008. On the campaign trail in 2011, he joked with a Florida voter that he was unemployed.

But unemployment for Romney looks a lot more lucrative than it does for most Americans.

"That may be one of the reasons they don't want to release the returns ... they don't want people to see that income," said Rebecca Wilkins, an attorney with Citizens for Tax Justice.

Romney and Bain Capital, the private equity firm he founded, have profited by setting up offshore investment vehicles and shipping American jobs overseas. The money from those activities has continued to flow to Romney long after he claims to have retired in 1999 from Bain, as evidenced by his tax returns.

One Bain investment that has been profitable for Romney, for example, is Sensata Technologies. The company is planning to shutter its Freeport, Ill., factory by November and move production to China. The soon-to-be-unemployed workers have pleaded with Romney to use his influence over Bain to stave off the closure. Romney has so far declined to do so.

Instead, Romney has transferred $170,000 worth of Sensata stock he owns to a charity he controls, a move that gave him a sizable tax deduction.

The Obama campaign has made Bain's offshoring efforts a top campaign issue, releasing a brutal ad overlaying Romney's outsourcing record atop a rendition of "America the Beautiful."

During an interview with the National Review, Romney said that sub-companies in the Cayman Islands help foreign investors avoid paying taxes on investments in the United States. Bain Capital currently has 138 sub-companies headquartered in the Cayman Islands.

"The so-called offshore account in the Cayman Islands, for instance, is an account established by a U.S. firm to allow foreign investors to invest in U.S. enterprises and not be subject to taxes outside of their own jurisdiction," Romney said. "So in many instances, the investments in something of that nature are brought back into the United States. The world of finance is not as simple as some would have you believe. Sometimes a foreign entity is formed to allow foreign investors to invest in the United States, which may well be the case with the entities that Democrats are describing as foreign accounts."

Related on HuffPost:

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  • SEC Filings List Romney As 'Chief Executive Officer'

    According to the <em><a href="http://www.boston.com/news/politics/articles/2012/07/12/government_documents_indicate_mitt_romney_continued_at_bain_after_date_when_he_says_he_left/" target="_hplink"><em>Boston Globe</em></a></em>, Securites and Exchange Commission documents filed by Bain Capital after February 1999 list Romney as the private equity firm's "stole stockholder, chairman of the board, chief executive officer, and president."

  • $100,000+ Salary

    The <em><a href="http://www.boston.com/news/politics/articles/2012/07/12/government_documents_indicate_mitt_romney_continued_at_bain_after_date_when_he_says_he_left/" target="_hplink">Globe</a></em> also found financial disclosure forms filed by Romney that indicate he still owned 100 percent of Bain in 2002, and earned at least $100,000 as an "executive" for the firm in 2001 and 2002.

  • 2002 Testimony

    As <a href="http://www.huffingtonpost.com/2012/07/12/mitt-romney-bain-departure_n_1669006.html?utm_hp_ref=politics" target="_hplink">The Huffington Post</a> reported, sworn testimony given by Romney in 2002 undermined his claims that he left Bain in 1999. In that testimony, given as part of a hearing to determine if he had sufficient Massachusetts residency to run for governor, Romney said that he "remained on the board" of the LifeLike Co., which Bain held a stake in at the time. LifeLike's 2000 <a href="http://www.sos.state.co.us/biz/ViewImage.do?fileId=20001165127&masterFileId=19961077091" target="_hplink">corporate filing</a>, filed with the state of Colorado, lists Romney as a director.

  • More SEC Filings

    HuffPost's Jason Cherkis and Ryan Grim identified at least <a href="http://www.huffingtonpost.com/2012/07/13/mitt-romney-bain-sec_n_1671819.html" target="_hplink">six documents</a> filed by Bain Capital with the SEC from 1999 to 2001 that were signed by Mitt Romney. Most of the documents refer to Romney as the "reporting person."

  • 'Managing Member' In 2002

    HuffPost <a href="http://www.huffingtonpost.com/2012/07/15/mitt-romney-bain-capital_n_1674209.html?utm_hp_ref=politics" target="_hplink">reported</a> on a 2002 corporate document filed with the state of Massachusetts that shows Romney listed as one of two managing members of Bain Capital Investors, an entity of the private equity firm.

  • Signed Documents After 1999

    Romney signed an SEC filing in November 1999 pursuant to Bain's partial acquisition of medical-waste firm Stericycle, <em><a href="http://www.motherjones.com/politics/2012/07/mitt-romney-bain-financial-disclosure" target="_hplink">Mother Jones</a></em> reported. The filing noted that he was the "sole shareholder, Chairman, Chief Executive Officer and President" of the Bain entities involved in the $75 million deal.

  • 2001 & 2002 SEC Filings

    <a href="http://talkingpointsmemo.com/archives/2012/07/no_romney_didnt_leave_bain_in_1999.php" target="_hplink">Talking Points Memo</a> uncovered two SEC filings from July 2000 and February 2001. In both, Romney lists his "principal occupation" as "Managing Director of Bain Capital, Inc."

  • 1999 News Reports

    As Slate's <a href="http://www.slate.com/blogs/weigel/2012/07/13/did_the_romney_campaign_create_the_swift_yachting_story_.html" target="_hplink">Dave Weigel</a> pointed out, Romney's campaign has cited news reports from 1999 that clearly state that Romney left Bain in 1999. However, those same news reports state that Romney would still be involved with the company. "Romney said he will stay on as a part-timer with Bain, providing input on investment and key personnel decisions," read one such report from the <em>Boston Herald</em>

  • Former Partner Speaks Out

    A former Bain Capital partner, Ed Conard, said during an appearance on MSNBC's "<a href="http://upwithchrishayes.msnbc.msn.com/_news/2012/07/15/12751962-former-bain-capital-partner-says-romney-was-legally-ceo-of-bain-capital-until-2002" target="_hplink">Up W/Chris Hayes</a>" that Romney was "legally" the CEO and sole owner of Bain Capital until 2002, as an ownership battle dragged on after Romney left to take over the Salt Lake City Olympics. "We had a very complicated set of negotiations that took us about two years for us to unwind. During that time a management committee ran the firm, and we could hardly get Mitt to come back to negotiate the terms of his departure because he was working so hard on the Olympics," Conard said.

  • Relationships With Problematic Companies

    HuffPost's Sam Stein <a href="http://www.huffingtonpost.com/2012/07/16/mitt-romney-bain-capital_n_1677133.html" target="_hplink">reported</a> that SEC filings link Romney to politically problematic companies after his alleged 1999 departure from Bain: <blockquote>A Huffington Post review of SEC files unearthed six separate occasions in which Romney was listed as a member of "the Management Committee" of both Bain Capital Investment Partners and BCIP Trust, "deemed to share voting and dispositive power with respect to" shares held of DDi. In one of those filings, Romney is listed as president and managing director of Bain Capital, Inc. The dates of those filings range from April 14, 2000 to May 10, 2001 -- all after Romney had left for Salt Lake City. In one March 2001 filing, Romney signed the document as the "reporting person."</blockquote>

  • 'General Partner'

    According at a <a href="http://www.huffingtonpost.com/2012/07/16/mitt-romney-bain_n_1677259.html" target="_hplink">document</a> filed with the California Secretary of State's office in July 1999, Romney was listed as a "general partner" at Bain Capital Partners. Romney's signature appears on the document. Romney remained on record as a general partner until California was notified of his resignation in June 2003.