The long arm of Uncle Sam is trying to reach into another rapper's pockets.

TMZ reports Rick Ross owes the IRS $5.7 million in unpaid taxes between 2012 and 2014.

The bulk of his debt ($4.6 million) comes from '12. Then he owes 570K for both '13 and '14.

The government has issued a lien, so if the Bawse doesn't pay the Feds could start taking his stuff.

This adds to Ross's problems with the authorities. Earlier this year he was indicted for kidnapping, aggravated battery, aggravated assault, and possession of a firearm in case involving his groundskeeper.