Tyga might want to consider selling off his Egyptian sand collection -- TMZ has learned, he allegedly owes Uncle Sam nearly $100,000.
According to a federal tax lien -- the rapper owes $11,201 for 2009, $4,437 for 2010, and $76,008 for 2011.
The total comes to $91,648 -- almost the exact amount he spent decorating his brand new L.A. clothing store, Last Kings. Among the ornaments ... a $20,000 Egyptian tomb.
Ten, ten, ten, twenties and them fifties ... won't come close to fixing this problem.