Prosecutors say Stone and his wife shielded their income in a commercial entity and used funds they owed the IRS on a "lavish lifestyle" instead.
The two men were together just hours before prosecutors said Roberto Minuta stormed the Capitol armed with a gun and bear spray.
Investigators are examining ties among Stone, inflammatory conspiracy theorist Alex Jones, and violent rioters, sources told The Washington Post.
"Never surrender, and fight for America!" Stone says on the tape as he rails against the results of a democratic election surrounded by Proud Boys.
Video obtained by ABC News shows the Donald Trump confidant flanked by members of the far-right militia the morning of the insurrection.
“The pardons from this President are what you would expect to get if you gave the pardon power to a mob boss...”
The president granted 26 more pardons, some of them to close allies, a day after granting clemency to 20 others.
Tensions rose after dark as scores of pro-Trump “Proud Boys” protesters and “Antifa” counterprotesters faced off, separated by police in riot gear and on bicycles.
The president could issue a series of pardons and commutations during his final weeks in office, according to reports.
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