The huge sum comes from not paying taxes in 2006, 2008 and 2010. I guess he used the same accountant as his big homey Jermaine Dupri who has had tax troubles of his own.
TMZ reports that there was a tax lien put on Bow Wow for $91,105.61 in the state of Florida in 2006 that still hasn't been taken care of. An additional lien was filed in Georgia claiming the rapper owes $15,279.62 for unpaid taxes in 2008 and another $19,700.91 in 2010.
All this adds up to $126,086.14.
I think he better hit Bryan Williams up for some of that Baby Money. After making Billboard's 100 list, we know they can afford it.