The Thursday guilty plea of former Trump Organization Chief Financial Officer Allen Weisselberg is the latest and largest development in New York officials’ multiyear investigation into the company headed by the former president. 

Weisselberg pleaded guilty to 15 counts related to tax fraud and will serve five months in prison followed by five years of probation. He will also pay almost $2 million in back taxes and penalties. 

As part of his agreement with the Manhattan District Attorney’s office, Weisselberg admitted to playing a role in enriching himself and other top Trump Organization executives through off-the-books benefits and other measures without reporting the income. He personally avoided paying $1.7 million in taxes over more than a decade through indirect compensation from the Trump Organization.