Busta Rhymes -- Just Call Me Busted ... Hit with $790K Tax Bill

Busta Rhymes may have to pass UP the Courvoisier ... and any other expensive habits ... 'cause Uncle Sam says the rapper owes just under a MILLION bucks in back taxes.

We've obtained IRS docs showing Busta is in a massive $789,577.90 hole with the Federal government.

The Dept. of the Treasury slapped him with two tax liens ... claiming he failed to pay more than $611K in taxes in 2008 ... and another $178K in 2012.

When reached for comment, Busta said ... Woo hah, woo hah!! They got me all in check.