Last night I received a letter from the IRS stating that I owed them a sizable amount of money, because of an error on my 2005 tax return. It was a horrible feeling, and I didn't sleep very well because of it. This morning I called my former employer cleared up a few things with them, and then called the IRS.
The IRS guy was very friendly, and very helpful (my former employer was as well), and cleared up the problem in no time. I had made a minor error in how I reported my income, but the amount of taxes I owed was actually correct. He was able to clear this up over the phone. I was impressed and greatly relieved.
Trust me I will never make that mistake again.