Gates was expected to be a star witness in the government's case against Manafort having pleaded guilty in February and agreed to co-operate with prosecutors under a deal that could lead to a reduced sentence.
Laporta also said Manafort was copied on several emails she sent to Gates regarding her concerns - but she did not consider calling Manafort directly because it appeared he was largely aware of what was happening.
Mr Gates was Mr Manafort's partner in the consultancy.
Gates testified that Manafort "requested I make wire transfers from the foreign accounts" and that "at Mr. Manafort's request", the two of them "did not disclose the foreign bank accounts" to the USA government.
Gates, who first met Manafort working for him as an intern fresh out of college, has been described by witnesses as Manafort's right-hand man in his multimillion-dollar political consulting business.
"Did you commit any crimes with Mr. Manafort?"
Those admissions are likely to become a focal point for Manafort's defence team when he is cross examined on Tuesday.
Prosecutors say this work resulted in earnings of around $60m (£46m) and that a "significant percentage" of this was omitted from Manafort's income tax returns. With an enormous salary serving his expensive lifestyle (earlier in Manafort's trial, we learned about his taste for ostrich jackets), Manafort had a pretty good racket going on, until he plunged into debt and made the fateful decision to run President Trump's long-shot campaign in 2016.
Gates, Manafort's long-time business partner, is expected to face a tough cross-examination later on Tuesday by defense lawyers in the first trial to arise from Special Counsel Robert Mueller's investigation into Russian interference in the 2016 USA election.
The charges relate to Manafort's work for Ukraine's former pro-Kremlin president, Viktor Yanukovich.
Manafort, a veteran lobbyist, has tried to get the financial charges against him dismissed and arguing that Mr Mueller has a "blank check" that he "has cashed, repeatedly".
Manafort's lawyers are expected to use the theft to try to undermine Gates' credibility as a witness.
Testimony from Mr Manafort's tax preparer continued on Monday. Laporta, who testified under an immunity deal with the government, acknowledged that she agreed under pressure from Gates to alter a tax document for one of Manafort's businesses.
In the telling of Manafort's legal team, any problems with his financial paperwork were either mistakes or the fault of Gates, who they say was stealing from Manafort and is now cooperating with investigators to cover his tracks. Laporta said she had no indication that the loan from Deripaska had been paid off.
After that, Gates sent her a document dated March 6, 2014, that purported to represent a $900,000 loan from a Cyprus entity, Telmar Limited, to Manafort's company.
Manafort, 69, meanwhile, is facing 18 felony charges that could carry a maximum of 30 years in prison.
Evacuees watch the sunset as smoke from the Ranch Fire rises into the sky at Austin Park Beach in California. The Mendocino Complex Fire is one of over a dozen large fires burning in California at the moment.
Since 2008, activists from all over the world have sailed 31 boats in attempts to challenge the Israeli naval blockade on Gaza. More than 140 Palestinians have been killed by Israeli forces since the outbreak of the Gaza border protests on March 30.
Among the theories he has promoted is that the September 11 , 2001, attacks on NY and Washington were staged by the government . InfoWars editor-at-large Paul Joseph Watson called the move an attack on free speech and conservative media.
The company's billionaire founder, Elon Musk, said engineers are also working on ways to recover the Falcon 9's second stage. SpaceX only had a two-hour launch window that opened at 1:18 am EST Tuesday in which to complete the mission.
He called on the countries of Europe to join the USA , saying, "The time has come to stop talking; the time has come to do". Iran's rial currency has lost half its value since April under the threat of revived United States sanctions.
The Gers survived a 1-1 draw in their Scottish Premiership opener after Alfredo Morelos was sent off 12 minutes into the match. If we had that little bit of quality in that final pass, we would have got another goal, maybe two or three.
Denver Nuggets basketball team, the Los Angeles Rams American Football team and the Colorado Rapids of Major League Soccer. After news broke of the bid the Arsenal Supporters' Trust (AST) called it a "dreadful day" for the football club.
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If convicted as charged, Clay could face a possible maximum sentence of three years in jail, prosecutors said. Austin Mikel Clay, 24, is accused of using a pickaxe to smash the smash the memorial on Hollywood Boulevard.
The Date Day: How To Behave When you meet your date offline for the first time, there are many things that can go wrong. That is a very responsible step that will either empower or destroy the already formed relationships.
How the Meat Industry Affects Our Planet
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Elon Musk tweets he may take Tesla private
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Russian airline says 18 killed in Siberian helicopter crash
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Seeyouatmidnight to serve the Scots a Grand National double
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How to Choose the Best Tennis Racket
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How Technology Has Completely Changed the Way We Spend Money
The Rise of Mobile Payments Over the last few years, all of the major mobile innovators have stepped into the mobile payment game. As of 2016, Apple Pay had 12 million monthly users , a figure which is sure to rise substantially in the coming months and years.