Lil Wayne was hit with a monster $5.6 million tax bill Monday, RadarOnline.com has learned.

That was the size of the lien the IRS filed against the rap artist's Miami mansion, reports the Detroit News.

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The waterfront estate is for sale for just under $13 million, and if he finds a buyer, the feds will take their millions before Weezy sees a dime.  Of course, he could just write them a check.

Wayne -- real name Dwayne Michael Carter Jr. -- served time in a New York prison last year after being convicted for criminal possession of a weapon.

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In December, he paid off a previous $1.1 million tax lien filed against the same property.

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