I'm a CPA in Southern California. Another possible option, if you extended your return, is to file what's known as a Superseded tax return. This actually takes the place of the first return if you file it before the due date. If you haven't extended your return, then you aren't able to go this route. The IRS and most states allow superseded returns, and it's why (among other reasons) we encourage our clients to file an extension, even if they intend on filing before 4/15. Many times certain elections need to be made on an originally filed return for example, and can't be made on an amended return.
Just amend your return with the correct info.
If you take a CPA, for them, the amendment process will basically be the same as a full tax return completion. They won't just fix the one thing you're talking about and submit it.
If you used TurboTax or similar software to prepare your return, there should be an option to prepare an amended return with the corrected information.
You would end up preparing a new return with the corrected data, and include Form 1040-X which explains the reason for the amendment.
Hope that helps.
I'd check with the CPA about the best way to address the issue and have them review the filing. They will probably fix the filing and refile it. I'm sure that there will be some level of penalties and interest involved.
My guess is that being proactive about the issue is better than ignoring it and hoping that you don't get audited.
In my experience. Like the DMV, they have a bad reputation that is both dated and/or exaggerated.
They understand people make mistakes. They want you to be honest and timely and follow the rules. As long as the rule are followed, they want you to avoid taxes.
If you make a mistake, hire a CPA to help you amend the return. If it's a first time thing, they'll likely abate any penalty and charge you the interest you owe.
I do agree that the idea that they're out to get people is incorrect.