Nas owes a total of nearly 6.5 million dollars to the IRS, it has been reported.
The rapper has outstanding back taxes of 6.46 million dollars, Rolling Stone reports.
The IRS have filed a 514,298 dollar tax lien at the start of January, which added to the previously unpaid 5.5 million dollar lien.
Nas faces other finical trouble after he has reportedly not paid his monthly child support fees to ex-wife Kelis.
Meanwhile, Nas has revealed that Kanye West is the main man to beat in Hip-Hop at the moment.
The Richest Rappers In Music
You can keep up to date with all the latest news from Gigwise by following us on Twitter and liking us on Facebook.

Elton John hospitalised with 'serious repiratory infection'
Lady Gaga 'won't change shows' after protests
Rihanna performs new single on American Idol - watch
Bruce Springsteen debuts 'Rocky Ground' video - watch
Nas praises Snoop and Dre's Tupac hologram as 'genius'
The hottest WAGs of rock and roll
The Enemy take 'Streets In The Sky' to Manchester
Who's tatt is that? Guess the rockstar from their body work