Birdman doesn't like to pay his debts. (He's like the opposite of a Lannister in this regard.)
While you can play that game with your former Hot Boys, the government doesn't play when you don't pay your taxes, as Baby just found out.
The Cash Money boss was recently hit with two federal tax liens -- one from December of 2014 and another from February of 2015 for a total $1,942,400.58. He tried his old trick of non-payment, and the government responded by telling him they were about to start taking his assets and property.
So Birdman promptly paid them the whole two mil.
The government: still the biggest, baddest gangstas of them all.