Tyga Tax City, Bitch Rapper Allegedly Owes Nearly $100,000

3/15/2014 12:15 AM PDT

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.