After hours of research at IRS.gov and my pension's website, I now understand that TT has a fundamental flaw in processing this 1099-R. It turns out that my type of pension is a defined benefit plan, which is excluded from RMD withdrawals. Such a plan doesn't even have an end of year balance on which to compute an RMD. So, TT should never have asked whether the reported distributions were RMD withdrawals. In the preface to this question (titled "About This Retirement Account"), TT states that I "needed to take a required minimum amount of money … out of this account." That is a false claim and the reason why I became confused about this question. The technically correct answer is "No, none of this withdrawal was an RMD.", but I never would have guessed that from the incorrect information given in the preface. I will report this bug to TT through the link provided by NCperson.
