Lohan's representative did not respond to a request for comment. An IRS official in California told Newsday that according to law, "We don't provide any confirmation or denial with anything to do with a specific taxpayer case."
Charlie Sheen -- with whom Lohan became friendly when they shot "Scary Movie 5" together in September -- reportedly wrote Lohan a $100,000 check last month to help her pay her taxes.
Also coming to Lohan's defense was "X Factor" judge Demi Lovato. Responding to blogger Perez Hilton, who had written about Lohan's troubles, Lovato tweeted: "Hey, how about you just leave her alone? Instead of kicking someone while they're down?"
Hilton tweeted in reply: "The media (me) is not harming Lindsay. She is doing that to herself. She needs to take accountability before she will get better." Lovato answered: "The media (not just you) don't realize when you need to stop. This isn't a headline for your readers. This is someone's life."
Lohan was arrested Thursday in Manhattan for allegedly punching a fellow clubgoer. The same day, the Santa Monica, Calif., city attorney filed charges of providing false information to police, reckless driving and willfully obstructing a police officer from their duties, in connection with a June 8 crash in which Lohan's Porsche collided with an 18-wheel truck.