Damon Dash — Jay-Z’s Ex-Biz Partner … ROC-A-TAX LIEN

Exclusive 0707_damon-dash_getty Damon Dash probably wishes he still had Jay-Z on speed dial … because the cesspool of debt he”s wading in just got worse … he”s been slapped with a $2.8 MILLION TAX BILL.

Dash — who co-founded Roc-A-Fella Records and Rocawear with Jay — has been open about the fact that he”s drowning in debt … despite the fact that at one time he was half-king of a multi-million-dollar business.

Now, his financial problems have worsened. Uncle Sam filed a federal tax lien against Dash, claiming he needs to cough up some un-paid tax cash for the years 2005 and 2011. The breakdown:

2005: $2,614,918.10
2011: $187,544.20

Grand total: $2,802,262.30 … i.e. a whole lotta cheddar.

The 2005 bill is clearly larger … which makes sense considering Hov and Dash parted ways back in 2004 — meaning in 2005, he was probably still raking in some major-taxable bucks. 2011 … not so much.

FYI — Dash has said he owes millions in back taxes to the State of NY and NJ and claims he”s lost multiple properties to foreclosure.

Meanwhile, Jay … is still super rich.