The problem with that is that mess over expected income is that you're supposed to do reconciliation on a month by month basis with the exchange as to your income amount. Failure to do so may result in Penalties & Interest being assessed in interesting ways for material misstatement of your income and, if somebody is feeling particularly nasty, violating 18 USC 1001. Everything will change because it is expected to change.
I am still left wondering how anybody thought PPACA was going to actually be functional. It certainly has increased the size of Medicaid enrollment if nothing else...