IN THE YEAR 2000 ... O.J. Simpson failed to pay over $300k in taxes to the State of California ... this according to a new lien filed against him.
According to docs recently filed by the State of CA Franchise Tax Board ... Simpson -- who is currently rotting away in a Nevada prison for Robbery -- still owes $318,566.04 in unpaid taxes from the Millennium.
TMZ broke the story ... O.J. is knee deep in financial trouble -- he has a federal lien filed against him for the years 2007-2010, for $179,435.07. Not to mention he still owes MILLIONS to the families of Nicole Brown Simpson and Ronald Goldman ... for causing their death.