Wow -- what a GREAT help you are and how blessed we are to have someone with your caring and expertise in the community!
Did as you suggested to find the more complete tax file with worksheets in the Print Center and that solved the problem. The Turbotax social security worksheet specifically mentions to include income on line 8 in the 1040, which is not specified in the IRS online ITA calculator. Turns out my line 8 had 644 in unemployment compensation, which when I added it in while re-trying the IRS online ITA calculator then gave the same result for taxable social security benefits as Turbotax.
Thank you so VERY much -- now I can stop tearing my hair out!
