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I received a letter from IRS saying that I owe $4,240 for excess social security tax withheld that they are disallowing. There was another thread that surprisingly was  closed by TT where several people has the issue with their 2015 tax return. I have been filing using TT since the late 90s so it is unlikely that I will make a mistake. I believe this is a serious flaw in the 2015 TT software wherein they guarantee 100% accuracy. If Intuit continue to deny that there's an issue with the 2015 TT filing then I have no choice but to seek legal help.