Since October, at least six independent and credible sources have confirmed rate increases on the ObamaCare exchanges will be in the double digits. However, these are gross premium hikes. Net premium hikes paid by enrollees are distorted by tax credits paid to insurers. These badly designed tax credits have a number of perverse consequences. It is widely understood that they impose disincentives to work. What is less well understood is that the tax credits are so badly designed that they impose a ratchet effect causing net premium hikes greater than the gross premium hikes. According to new research published by the National Center for Policy Analysis, this effect is concentrated among ObamaCare enrollees in the lowest income brackets.