It's unclear how the possible deal might affect Manafort's pursuit of a pardon from President Donald Trump.
A juror in the Virginia case said she discounted testimony from Gates but found the documents that prosecutors introduced to be "overwhelming" in favor of conviction.
According to court documents, he has agreed to plead guilty on Friday to two criminal counts in the investigation by Special Counsel Robert Mueller.
At a rally in August, Trump said: "I feel very badly for Paul Manafort". Trump has raised the idea of a pardon for Manafort with White House aides and others, a source told NPR.
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The plea deal would allow Manafort to avoid a second trial that had been scheduled to start next week in Washington.
The allegations do not involve his work with the Trump campaign.
Over a 40-year career, Manafort redefined and expanded Washington's influence industry domestically and internationally, parlaying successful campaigns into lobbying opportunities.
Manafort was accused of concealing from the IRS tens of millions of dollars in proceeds from his Ukrainian patrons and conspiring to launder that money through offshore accounts in Cyprus and elsewhere. He led the campaign in mid-2016 when Trump was selected as the Republican presidential nominee at the party convention.
The move toward a guilty plea is another reversal for Manafort, who has fought vociferously - but unsuccessfully - against Mueller's probe. The remaining five charges against Manafort will be dropped. And it was Jackson (a Barack Obama appointee) who, earlier this year, removed Manafort's home detention status and ordered him jailed for tampering with witnesses. "Nothing to do with Russian Federation collusion".
This is a breaking news story and will be updated.