I was hit with a huge tax bill because my foreign tax credit was somehow blown away in my tax return. I was able to refile my forms, and getting an ITIN for my wife, changed my filing status to go from a huge bill to a smaller but significant refund.

I did this by myself without a CPA but I knew what I was doing. The IRS was pretty understanding the whole way and quickly understood my situation. They never tried to threaten me or anything like that. It didn’t help that their mail to china kept getting lost, however.