TAX ON SOCIAL SECURITY

Up to 85% of your Social Security benefits can be taxable on your federal tax return.  There is no age limit for having to pay taxes on Social Security benefits if you have other sources of income along with the SS benefits.  When you have other income such as earnings from continuing to work, investment income, pensions, etc. up to 85% of your SS can be taxable.

To see how much of your Social Security was taxable, look at lines 5a and 5b of your Form 1040

Some additional information:  There are 13 states that tax Social Security—Colorado, Connecticut, Kansas, Minnesota, Missouri, Montana, Nebraska, New Mexico, North Dakota, Rhode Island, Utah, Vermont, and West Virginia.  These states offer varying degrees of income exemptions, but four mirror the federal tax schedule: MN, ND,VT, and WV

The program will calculate the taxable portion automatically ...  

See page 7 in this IRS pub for the worksheet for estimation purposes : 

https://www.irs.gov/pub/irs-pdf/p915.pdf