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Former Trump Organization CFO Allen Weisselberg pleaded guilty Thursday to tax violations spanning over a decade, agreeing to serve 100 days behind bars and testify about the Trump Organization's business practices.

Weisselberg, 75, was charged with evading taxes by receiving perks that were not counted as income. He pleaded not guilty to 15 counts, including grand larceny last year, which, in the state of New York, is the unlawful taking of funds or property valued at $50,000 or more.

"In one of the most difficult decisions of his life, Mr. Weisselberg decided to enter a plea of guilty today to put an end to this case and the years-long legal and personal nightmares it has caused for him and his family," Weisselberg's attorney, Nicholas Gravante Jr., said. 

TRUMP ORGANIZATION CFO ALLEN WEISSELBERG SURRENDERS TO MANHATTAN DA AHEAD OF EXPECTED TAX-RELATED CHARGES

FILE - In this Jan. 11, 2017, file photo, Allen Weisselberg, center, stands between President-elect Donald Trump, left, and Donald Trump Jr., at a news conference in the lobby of Trump Tower in New York.  (AP Photo/Evan Vucci, File)

Weisselberg was accused of receiving compensation "unreported or misreported" to the tax authorities, namely benefits such as a company car and a company apartment in New York City.

TRUMP ORGANIZATION CFO ALLEN WEISSELBERG CONSIDERING A PLEA DEAL AS PART OF MANHATTAN DA PROBE

Weisselberg was charged as part of then-Manhattan District Attorney Cyrus Vance’s investigation into the Trump Organization, which began in 2019. Alvin Bragg is now serving as district attorney.

Former Trump Organization CFO Allen Weisselberg arrives for court hearing

Allen Weisselberg, center, former President Donald Trump's company chief financial officer, arrives to attend the hearing for the criminal case at the criminal court in lower Manhattan in New York on July 1, 2021. (TIMOTHY A. CLARY/AFP via Getty Images)

"Thanks to the incredibly hard work and dedication of the team prosecuting this case, Weisselberg will spend time behind bars," Bragg said. "We look forward to proving our case in court against the Trump Organization."

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Two Trump-related companies also pleaded not guilty to tax-related crimes as part of that investigation.

Another source familiar with the investigation told Fox News that one of the Trump corporations will go to trial this fall and is not taking a plea deal. 

Fox News' Brooke Singman contributed to this report.