I have about the same amount of Soc Sec this year as last. However I have $7,000 less Non Taxable Soc Sec this year, why?

You probably have less taxable income in 2017 then you had in 2016.

Up to 85% of Social Security Retirement/Disability/Survivors benefits becomes taxable when all your other income plus 1/2 your social security reaches:

• Married Filing Jointly - $32,000
• Single or Head of Household - $25,000
• Married Filing Separately - 0