It appears TurboTax failed to properly calculate the taxable portion of my SSA income as well. I went from refund status to receiving a CP11 stating I owe additional tax. TurboTax a.i. chat is no help and I am overseas at the moment; so my only recourse is to pay the amount on the notice before the due date and possibly work on a1040x later if I disagree with the IRS calculation. Which is probably correct. The TurboTax accuracy guarantee only covers penalties and interest, it appears, not aggravation.
