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Terror Squad boss Fat Joe has turned himself in to authorities begin serving his four month bid for tax evasion.

The rapper — real name Joseph Cartagena — is officially in custody at the Federal Detention Center in Miami.

As TMZ previously reported, Joe pled guilty back in December to stiffing Uncle Sam on a boatload of taxes for the years 2007 and 2008 … more than $1 million total.

He originally faced up to two years in the slammer for the crime — but was ultimately sentenced to just 4 months and a $15,000 fine, plus one-year supervised release.(TMZ)