Social Security benefits are reported on the SSA-1099.
The total benefits are reported as you note on line 6a on the 1040.
However, up to 85% of the benefits may be taxable based on how much SS you get and how much other income you have. TurboTax will calculate the amount of SS that is taxable and put that amount in line 6b.
If you have the CD/download software or are using the Online software and have paid for it, you can see the "Social Security Benefits Worksheet" which shows the calculation.
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