[kelnos]

You're already at the mercy of the federal government to do them correctly. If they decide you owe more than you put down on your return, they'll send you a bill. Sure, you can appeal it. But that's no different than if they did your taxes for you, you disagreed, and had to appeal it.

In two separate years (that I remember), I did something wrong. One of the years the IRS sent me a bill to fix my mistake, the other time my error was in the other direction and they sent me a refund. So clearly the IRS is already doing my taxes for me. Just they're not allowed to show me their work before I show them mine.