Slap-happy Katt Williams better learn to take it like he gives it -- because the IRS just walloped the comedian with an astronomical tax lien ... totaling over $4 MILLION.
Uncle Sam filed the lien against Williams, claiming the comedian failed to pay $3.2 million in taxes in 2008 ... and also bailed on another $829,352 in 2009.
It's not the first time Williams has been accused of stiffing the Feds -- back in 2010 the IRS filed another tax lien against the comedian totaling $284,000 ... mere pennies compared to the new bill.
It's the latest misfortune to befall Katt in the last few months -- he's been arrested several times, he's facing a bunch of nasty lawsuits, and his whole life is kinda going haywire.
Calls to Katt's people weren't returned.
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