Retirement tax questions

Thanks for the quick response to my question. It seemed to me that what you said is correct but I appreciate hearing it from an knowledgeable source. 

 

I think the confusion is created by some of the summary statements from the IRS that claims that Social Security Benefits" are not "generally" included in "investment" income and on the form they are not but they are included in triggering the tax and in determining the amount payable.

 

Thanks again.