The US Treasury secretarys former bank financed offshore private jets for wealthy clients, including a billionaire Yemeni businessman whose son is wanted for rape and murder in the UK.
CIT Bank, where Mnuchin was deputy chairman, provided customers with financing structures for personal aircraft priced at tens of millions of dollars, which customers used to legally avoid sales taxes and other charges.
One leaked file from October 2015 shows CIT billing an Isle of Man company $430,993 for an instalment on a $30m Dassault Falcon 2000EX jet. Other files say that the ultimate owner of the Isle of Man company is Shaher Abdulhak Besher.
Besher, an ally of the former Yemeni president Ali Abdullah Saleh, has a business portfolio spanning drinks bottlers, telecoms and several other industries.
His son Farouk Abdulhak, 30, is wanted in London on suspicion of raping and murdering Martine Vik Magnussen, a 23-year-old student, who was found dead in a basement in Fitzrovia in May 2008. He denies the allegations.
Mnuchin is not named in the leaked documents and it is unclear whether he was aware of the arrangements. The financing for Besher was set up by CIT in 2012, before Mnuchins arrival. The arrangement continued through Mnuchins tenure. Mnuchin was paid $11.2m by CIT in 2016, before leaving to join Trumps administration. CIT sold its aircraft financing division last year.
A spokeswoman for CIT said: CIT complies with all laws, regulations and ethical standards in pursuit of its business. An attorney for Besher said he declined to comment. Treasury spokespeople did not respond to multiple requests for comment.
The Trump administrations most senior banking watchdog appears in the Paradise Papers in connection with an offshore bank that is under investigation by US authorities for possible tax evasion.
Quarles, Trumps vice-chairman for supervision at the Federal Reserve, is named in the files as an officer of two firms incorporated in the Cayman Islands by the Carlyle Group, the private equity giant where Quarles was a partner until 2013.
The files detail transactions between one of Quarless offshore vehicles and Butterfield, a Bermuda-based bank in which Carlyle had led a $550m investment in 2010. That stake was one of several in distressed banks bought up by a new specialist team at Carlyle, including Quarles, following the 2008 financial crisis.
In November 2013, federal authorities secured court orders requiring a group of US banks to disclose information on Americans who may be evading or have evaded federal taxes via undisclosed affiliated accounts at offshore banks including Butterfield. They said 81 such accounts at Butterfield had already been disclosed.
Butterfield said in its last annual report that it was cooperating with US authorities and had set aside $5.5m to pay penalties that may arise from the inquiries.
Quarles told ethics regulators this year that he held assets worth between $5m and $25m in a Carlyle fund that held a stake in Butterfield. He said he intended to sell his holdings in that and most other Carlyle funds.
A Federal Reserve spokesman said Quarles had no specific responsibilities, was not delegated any responsibilities by the board, and received no income for this position at the offshore company, and had divested from Butterfield when he joined the government.
Jon Huntsman Photograph: Rick Bowmer/AP
Trumps new US ambassador to Russia helped lead a previously undisclosed offshore company, according to the leaked files.
Huntsman, the former Utah governor, was listed as a director of HICI International Sales Corporation in a confidential filing to authorities in Barbados, where the company was formed in 1999. The offshore vehicle was set up to carry out overseas sales for Huntsman ICI, an industrial chemicals branch of Huntsman Corporation.
The filing said HICI was owned by Huntsman ICI Holdings LLC in the US, where Huntsman was vice-chairman and manager. In 2000, Huntsman ICI reported making a $151m profit on revenues of $4.4bn.
HICI was a foreign sales corporation, a type that allowed Americans to exempt 32% of overseas income from US taxation under 1984 reforms signed by Ronald Reagan. The US closed the loophole in 2007.
Troy Keller, a spokesman for Huntsman Corporation, said of HICI: It existed for just a few years and it participated in a US government-created program to promote exports.
Huntsman Corporation did not report the offshore vehicle in its public filings to the Securities and Exchange Commission (SEC). Subsidiaries in tax havens may be omitted from public filings if they comprise less than 10% of a companys assets, investments, or income.
The leaked files did not detail how much revenue passed through HICI. When he ran for president in 2012, Huntsman said his stakes in Huntsman companies were worth up to $50m.
What are the Paradise Papers? video Kenneth Juster
Trumps ambassador to India benefited from the offshore business of his former investment company and its billion-dollar purchase of a shipping corporation.
Juster is named in the Paradise Papers as a beneficial owner of a Bermuda-based branch of Warburg Pincus, a private equity firm where he was a partner before joining the Trump administration.
Juster, who was a senior economic adviser to the president until this summer, declared holdings in Warburg Pincus worth up to $5m to ethics officials this year.
He was separately listed among Warburg partners in compliance documents relating to the buyout firms 2011 purchases of Triton Container International, a shipping container leasing company, and its sister firm International Asset Systems, which makes cargo tracking software.
A state department official said in an email: Mr Juster has, at all times, fully disclosed and properly reported these financial interests on his US federal income tax returns. He also has timely filed and fully paid all US federal income tax liabilities in connection with the ownership of these interests.
Carl Icahn Photograph: Brendan Mcdermid/Reuters
Icahn, a friend and former adviser to Trump, owns a $250m mining company spread across three tax havens and structured in a way that limits the information it must disclose to US authorities.
The leaks detail how Icahn holds a controlling stake in Ferrous Resources, a Brazilian mining company officially based on the Isle of Man. It in turn owns a pair of holding companies in Luxembourg and Malta, which operate iron mines in Brazil.
All three jurisdictions offer low- or zero-tax regimes for corporations, making them destinations of choice for foreign businesses seeking to legally lower their tax bills. A report in 2015 by Citizens for Tax Justice said Icahn operated 20 subsidiaries in offshore tax havens.
Icahn was a special adviser to the president until August and has a net worth of about $16.6bn, according to Forbes.
An email unearthed in the Paradise Papers said the structure of Ferrous Resources meant it escaped some disclosure requirements under an Obama-era law aimed at preventing offshore tax avoidance. The structure of Ferrous Resources was in place when Icahn bought the company.
Icahn was separately identified in the documents as having been a director for 11 years of Scientia Health Group, an investment company based in Bermuda in which he and his wife, Gail, held a stake. The firms investors also included the celebrity chef and lifestyle guru Martha Stewart and the disgraced film mogul Harvey Weinstein.
Jesse Lyn, general counsel for Icahn Enterprises, said: We invested significant sums to save Ferrous from bankruptcy and to date have lost hundreds of millions of dollars on the investment. Lyn said Icahn formerly held a small stake in Scientia which had nothing to do with the companys tax planning or structuring.
Tom Barrack Photograph: Bloomberg via Getty Images
The chairman of Trumps inaugural committee leads a $58bn real estate investment trust that channels some of its profits to the low- or no-tax jurisdictions of Luxembourg, the Cayman Islands and Lebanon.
Barrack, who has described himself as one of the presidents closest friends for 40 years, appears in the Paradise Papers through offshore subsidiaries of Colony NorthStar, of which he is CEO.
In 2011, Appleby helped devise a rolling credit facility linking Barracks US-based investment funds with a pair of Cayman-Islands-based subsidiaries dealing in troubled real estate, which the lawyers asked him personally to approve.
A confidential chart in the leaked documents suggested money would flow from the funds in Delaware to a Cayman Islands entity, Colony Distressed Credit Fund II Feeder A, which was exempted, meaning it paid no local taxes. The chart suggested the money would then be repatriated in a complex web to a separate Delaware subsidiary closer to the parent company.
Barrack was an early endorser of Trump for president, co-founding the Rebuilding America Now Super Pac, which pumped $23m into the 2016 race. He was rewarded by being invited to deliver a keynote address at the Republican national convention.
Barrack declined to clarify whether he was aware that Colony was passing money through a subsidiary in the Cayman Islands or whether the feeder funds were set up to reduce tax payments. The firm said: Colony NorthStar is in strict compliance with the letter and spirit of all applicable rules for cross-border business, as we have been for more than 25 years.