The fact that the IRS sends out their preliminary calculations for citizen to base their own filing on doesn't affect the total error rate for any inherent reas

The fact that the IRS sends out their preliminary calculations for citizen to base their own filing on doesn't affect the total error rate for any inherent reason, so ideally nothing new would happen. That said I'm sure US congress could find some interesting way to involve for profit companies in the process that makes everyone even more miserable than the current system.