Last month, the Internal Revenue Service filed a federal tax lien against Martin Shkreli, alleging that he owes the government quite a bit of money—$4,628,928.55, to be precise.

Shkreli, who is facing federal securities fraud charges in Brooklyn, allegedly owes $3,431.85 from 2013 and $4,625,496.70 from 2014. The lien was prepared on December 18, 2015 and filed with the Office of the City Register on January 11, 2016.

“We are giving a notice that taxes (including interest and penalties) have been assessed against the following-named taxpayer,” the document states. “We have made a demand for payment of this liability, but it remains unpaid. Therefore, there is a lien in favor of the United States on all property and rights to property belonging to this taxpayer for the amount of these taxes, and additional penalties, interest, and costs that may accrue.”

Earlier this month, federal prosecutors revealed that one of Shkreli’s E-trade brokerage accounts, initially worth about $45 million had shrunk considerably, to less than $5 million, thereby endangering his bail.

Shkreli declined to comment on the lien to Gawker, as did his attorney Benjamin Brafman. The IRS did not immediately respond to a request for comment.

