I opened a case with Turbro Tax. They said i didn't use the 6251 in their system prior to filing. I completed my return before the 6251 was available but couldn't finalize it until it was ready. When it became available, i ran the final check in TT, and assumed it was included in all the calculations. So, when TT said there was nothing else they could do for me, I paid the penalty, which wasn't that much, and moved on. Yes, the IRS provided me their calculations, but it was not that clear to me what they had changed. At this point, two years later, I don't recall all the details. I don't advocate for rolling over with TT or the IRS. But my time was at a premium at that point, and i paid the penalty and went on.
Tax Year was unusual for me in that i sold a lot of properties. It has not been a problem since then.
