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20a are the benefits as show in box 5 of the SSA1099 (socials security statement). 20b is the taxable portion, portion of benefits included in your taxable income - line 20b on your 1040.
I am sorry, you did not say you want the federal calculation. Beside you did not give me any numbers to work with and if you use Turbo Tax, the software will do the calculation for you.