Retirement tax questions

Thank you for your feedback. 

Yes, I am aware of everything you said. I know that part of the SS payment is taxable and I see that in the return. I have been receiving this pension for years and knows that it is taxable. It goes up a little bit every year. I see that the rental loss was subtracted from the income.  I checked and triple checked all my entries and did NOT find anything that should require this additional tax. I did not have it on prior years return. I have no dividends nor any capital gain either. Strictly SS and the military pension. What am I not understanding. I have been doing tax for a long time and had volunteered once with the AARP tax for seniors.