IRS: Martin Shkreli Owes $4.5 Million in Unpaid TaxesBrendan O'Connor2/11/16 4:45pm13927EditPromoteDismissUndismissHideGo to permalinkLast 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.