The State Department of Taxation and Finance says David Alexander did not file income tax returns from 2001 to 2007.
The 60-year-old has pleaded to a total of five felonies. Alexander will now avoid a jury trial because of his guilty plea.
Alexander worked as an independent contractor for the Trump Organization.
The state says he's admitted to earning almost $3.6-million-dollars and owning a tax liability of more than $260,000 dollars. Alexander will be sentenced in January.